<?xml version="1.0" encoding="US-ASCII" standalone="no"?>
<!--Generated by ThunderDome XBRL - 02:50PM UTC 2026-05-16--><xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:country="http://xbrl.sec.gov/country/2026" xmlns:currency="http://xbrl.sec.gov/currency/2026" xmlns:dei="http://xbrl.sec.gov/dei/2026" xmlns:dtr-types="http://www.xbrl.org/dtr/type/2020-01-21" xmlns:ecd="http://xbrl.sec.gov/ecd/2026" xmlns:enum2="http://xbrl.org/2020/extensible-enumerations-2.0" xmlns:exch="http://xbrl.sec.gov/exch/2026" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:naics="http://xbrl.sec.gov/naics/2026" xmlns:naii="http://www.nai-online.com/20260331" xmlns:sic="http://xbrl.sec.gov/sic/2026" xmlns:srt="http://fasb.org/srt/2026" xmlns:srt-types="http://fasb.org/srt-types/2026" xmlns:stpr="http://xbrl.sec.gov/stpr/2026" xmlns:us-gaap="http://fasb.org/us-gaap/2026" xmlns:us-types="http://fasb.org/us-types/2026" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xmlns:xbrli="http://www.xbrl.org/2003/instance" xmlns:xlink="http://www.w3.org/1999/xlink" attributeFormDefault="unqualified" elementFormDefault="qualified" targetNamespace="http://www.nai-online.com/20260331">
  <xsd:import namespace="http://fasb.org/srt/2026" schemaLocation="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd"/>
  <xsd:import namespace="http://xbrl.sec.gov/ecd/2026" schemaLocation="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd"/>
  <xsd:import namespace="http://www.xbrl.org/2003/instance" schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd"/>
  <xsd:import namespace="http://xbrl.sec.gov/dei/2026" schemaLocation="https://xbrl.sec.gov/dei/2026/dei-2026.xsd"/>
  <xsd:import namespace="http://xbrl.sec.gov/exch/2026" schemaLocation="https://xbrl.sec.gov/exch/2026/exch-2026.xsd"/>
  <xsd:import namespace="http://xbrl.org/2005/xbrldt" schemaLocation="http://www.xbrl.org/2005/xbrldt-2005.xsd"/>
  <xsd:import namespace="http://xbrl.sec.gov/currency/2026" schemaLocation="https://xbrl.sec.gov/currency/2026/currency-2026.xsd"/>
  <xsd:import namespace="http://xbrl.sec.gov/country/2026" schemaLocation="https://xbrl.sec.gov/country/2026/country-2026.xsd"/>
  <xsd:import namespace="http://xbrl.sec.gov/naics/2026" schemaLocation="https://xbrl.sec.gov/naics/2026/naics-2026.xsd"/>
  <xsd:import namespace="http://www.xbrl.org/dtr/type/2020-01-21" schemaLocation="https://www.xbrl.org/dtr/type/2020-01-21/types.xsd"/>
  <xsd:import namespace="http://xbrl.org/2020/extensible-enumerations-2.0" schemaLocation="https://www.xbrl.org/2020/extensible-enumerations-2.0.xsd"/>
  <xsd:import namespace="http://xbrl.sec.gov/stpr/2026" schemaLocation="https://xbrl.sec.gov/stpr/2026/stpr-2026.xsd"/>
  <xsd:import namespace="http://xbrl.sec.gov/sic/2026" schemaLocation="https://xbrl.sec.gov/sic/2026/sic-2026.xsd"/>
  <xsd:import namespace="http://fasb.org/us-types/2026" schemaLocation="https://xbrl.fasb.org/us-gaap/2026/elts/us-types-2026.xsd"/>
  <xsd:import namespace="http://www.xbrl.org/2009/role/negated" schemaLocation="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd"/>
  <xsd:import namespace="http://fasb.org/srt-types/2026" schemaLocation="https://xbrl.fasb.org/srt/2026/elts/srt-types-2026.xsd"/>
  <xsd:import namespace="http://fasb.org/us-gaap/2026" schemaLocation="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd"/>
  <xsd:annotation>
    <xsd:appinfo>
      <link:linkbaseRef xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="naii-20260331_lab.xml" xlink:role="http://www.xbrl.org/2003/role/labelLinkbaseRef" xlink:type="simple"/>
      <link:linkbaseRef xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="naii-20260331_cal.xml" xlink:role="http://www.xbrl.org/2003/role/calculationLinkbaseRef" xlink:type="simple"/>
      <link:linkbaseRef xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="naii-20260331_def.xml" xlink:role="http://www.xbrl.org/2003/role/definitionLinkbaseRef" xlink:type="simple"/>
      <link:linkbaseRef xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="naii-20260331_pre.xml" xlink:role="http://www.xbrl.org/2003/role/presentationLinkbaseRef" xlink:type="simple"/>
      <link:roleType id="statement-document-and-entity-information" roleURI="http://www.nai-online.com/20260331/role/statement-document-and-entity-information">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">000 - Document - Document And Entity Information</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-condensed-consolidated-balance-sheets-unaudited" roleURI="http://www.nai-online.com/20260331/role/statement-condensed-consolidated-balance-sheets-unaudited">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">001 - Statement - Condensed Consolidated Balance Sheets (Unaudited)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-condensed-consolidated-balance-sheets-unaudited-parentheticals" roleURI="http://www.nai-online.com/20260331/role/statement-condensed-consolidated-balance-sheets-unaudited-parentheticals">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">002 - Statement - Condensed Consolidated Balance Sheets (Unaudited) (Parentheticals)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-condensed-consolidated-statements-of-operations-and-comprehensive-loss-unaudited" roleURI="http://www.nai-online.com/20260331/role/statement-condensed-consolidated-statements-of-operations-and-comprehensive-loss-unaudited">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">003 - Statement - Condensed Consolidated Statements of Operations and Comprehensive Loss (Unaudited)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-condensed-consolidated-statements-of-stockholders-equity-unaudited" roleURI="http://www.nai-online.com/20260331/role/statement-condensed-consolidated-statements-of-stockholders-equity-unaudited">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">004 - Statement - Condensed Consolidated Statements of Stockholders' Equity (Unaudited)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-condensed-consolidated-statements-of-cash-flows-unaudited" roleURI="http://www.nai-online.com/20260331/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">005 - Statement - Condensed Consolidated Statements of Cash Flows (Unaudited)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-a-basis-of-presentation-and-summary-of-significant-accounting-policies" roleURI="http://www.nai-online.com/20260331/role/statement-note-a-basis-of-presentation-and-summary-of-significant-accounting-policies">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">006 - Disclosure - Note A - Basis of Presentation and Summary of Significant Accounting Policies</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-b-inventories-net" roleURI="http://www.nai-online.com/20260331/role/statement-note-b-inventories-net">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">007 - Disclosure - Note B - Inventories, Net</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-c-property-and-equipment" roleURI="http://www.nai-online.com/20260331/role/statement-note-c-property-and-equipment">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">008 - Disclosure - Note C - Property and Equipment</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-d-other-comprehensive-loss" roleURI="http://www.nai-online.com/20260331/role/statement-note-d-other-comprehensive-loss">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">009 - Disclosure - Note D - Other Comprehensive Loss</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-e-leases-" roleURI="http://www.nai-online.com/20260331/role/statement-note-e-leases-">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">010 - Disclosure - Note E - Leases</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-f-debt" roleURI="http://www.nai-online.com/20260331/role/statement-note-f-debt">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">011 - Disclosure - Note F - Debt</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-g-economic-dependency" roleURI="http://www.nai-online.com/20260331/role/statement-note-g-economic-dependency">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">012 - Disclosure - Note G - Economic Dependency</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-h-segment-information" roleURI="http://www.nai-online.com/20260331/role/statement-note-h-segment-information">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">013 - Disclosure - Note H - Segment Information</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-i-income-taxes" roleURI="http://www.nai-online.com/20260331/role/statement-note-i-income-taxes">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">014 - Disclosure - Note I - Income Taxes</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-j-treasury-stock-" roleURI="http://www.nai-online.com/20260331/role/statement-note-j-treasury-stock-">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">015 - Disclosure - Note J - Treasury Stock</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-k-derivatives-and-hedging" roleURI="http://www.nai-online.com/20260331/role/statement-note-k-derivatives-and-hedging">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">016 - Disclosure - Note K - Derivatives and Hedging</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-l-contingencies" roleURI="http://www.nai-online.com/20260331/role/statement-note-l-contingencies">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">017 - Disclosure - Note L - Contingencies</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-m-subsequent-events" roleURI="http://www.nai-online.com/20260331/role/statement-note-m-subsequent-events">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">018 - Disclosure - Note M - Subsequent Events</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-significant-accounting-policies-policies" roleURI="http://www.nai-online.com/20260331/role/statement-significant-accounting-policies-policies">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">995465 - Disclosure - Significant Accounting Policies (Policies)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-a-basis-of-presentation-and-summary-of-significant-accounting-policies-tables" roleURI="http://www.nai-online.com/20260331/role/statement-note-a-basis-of-presentation-and-summary-of-significant-accounting-policies-tables">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">995466 - Disclosure - Note A - Basis of Presentation and Summary of Significant Accounting Policies (Tables)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-b-inventories-net-tables" roleURI="http://www.nai-online.com/20260331/role/statement-note-b-inventories-net-tables">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">995467 - Disclosure - Note B - Inventories, Net (Tables)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-c-property-and-equipment-tables" roleURI="http://www.nai-online.com/20260331/role/statement-note-c-property-and-equipment-tables">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">995468 - Disclosure - Note C - Property and Equipment (Tables)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-d-other-comprehensive-loss-tables" roleURI="http://www.nai-online.com/20260331/role/statement-note-d-other-comprehensive-loss-tables">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">995469 - Disclosure - Note D - Other Comprehensive Loss (Tables)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-e-leases-tables" roleURI="http://www.nai-online.com/20260331/role/statement-note-e-leases-tables">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">995470 - Disclosure - Note E - Leases (Tables)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-g-economic-dependency-tables" roleURI="http://www.nai-online.com/20260331/role/statement-note-g-economic-dependency-tables">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">995471 - Disclosure - Note G - Economic Dependency (Tables)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-h-segment-information-tables" roleURI="http://www.nai-online.com/20260331/role/statement-note-h-segment-information-tables">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">995472 - Disclosure - Note H - Segment Information (Tables)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-j-treasury-stock-tables" roleURI="http://www.nai-online.com/20260331/role/statement-note-j-treasury-stock-tables">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">995473 - Disclosure - Note J - Treasury Stock (Tables)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-a-basis-of-presentation-and-summary-of-significant-accounting-policies-details-textual" roleURI="http://www.nai-online.com/20260331/role/statement-note-a-basis-of-presentation-and-summary-of-significant-accounting-policies-details-textual">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">995474 - Disclosure - Note A - Basis of Presentation and Summary of Significant Accounting Policies (Details Textual)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-a-basis-of-presentation-and-summary-of-significant-accounting-policies-calculation-of-basic-and-diluted-net-income-per-common-share-details" roleURI="http://www.nai-online.com/20260331/role/statement-note-a-basis-of-presentation-and-summary-of-significant-accounting-policies-calculation-of-basic-and-diluted-net-income-per-common-share-details">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">995475 - Disclosure - Note A - Basis of Presentation and Summary of Significant Accounting Policies - Calculation of Basic and Diluted Net Income Per Common Share (Details)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-a-basis-of-presentation-and-summary-of-significant-accounting-policies-contract-liabilities-and-revenue-recognized-details" roleURI="http://www.nai-online.com/20260331/role/statement-note-a-basis-of-presentation-and-summary-of-significant-accounting-policies-contract-liabilities-and-revenue-recognized-details">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">995476 - Disclosure - Note A - Basis of Presentation and Summary of Significant Accounting Policies - Contract Liabilities and Revenue Recognized (Details)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-a-basis-of-presentation-and-summary-of-significant-accounting-policies-fair-value-of-derivative-instruments-classified-as-level-2-assets-and-liabilities-details" roleURI="http://www.nai-online.com/20260331/role/statement-note-a-basis-of-presentation-and-summary-of-significant-accounting-policies-fair-value-of-derivative-instruments-classified-as-level-2-assets-and-liabilities-details">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">995477 - Disclosure - Note A - Basis of Presentation and Summary of Significant Accounting Policies - Fair Value of Derivative Instruments Classified As Level 2 Assets and Liabilities (Details)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-b-inventories-net-summary-of-inventories-details" roleURI="http://www.nai-online.com/20260331/role/statement-note-b-inventories-net-summary-of-inventories-details">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">995478 - Disclosure - Note B - Inventories, Net - Summary of Inventories (Details)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-c-property-and-equipment-details-textual" roleURI="http://www.nai-online.com/20260331/role/statement-note-c-property-and-equipment-details-textual">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">995479 - Disclosure - Note C - Property and Equipment (Details Textual)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-c-property-and-equipment-summary-of-property-and-equipment-details" roleURI="http://www.nai-online.com/20260331/role/statement-note-c-property-and-equipment-summary-of-property-and-equipment-details">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">995480 - Disclosure - Note C - Property and Equipment - Summary of Property and Equipment (Details)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-d-other-comprehensive-loss-schedule-of-other-comprehensive-loss-details" roleURI="http://www.nai-online.com/20260331/role/statement-note-d-other-comprehensive-loss-schedule-of-other-comprehensive-loss-details">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">995481 - Disclosure - Note D - Other Comprehensive Loss - Schedule of Other Comprehensive Loss (Details)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-e-leases-details-textual" roleURI="http://www.nai-online.com/20260331/role/statement-note-e-leases-details-textual">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">995482 - Disclosure - Note E - Leases (Details Textual)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-e-leases-lease-cash-flow-information-details" roleURI="http://www.nai-online.com/20260331/role/statement-note-e-leases-lease-cash-flow-information-details">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">995483 - Disclosure - Note E - Leases - Lease Cash Flow Information (Details)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-f-debt-details-textual" roleURI="http://www.nai-online.com/20260331/role/statement-note-f-debt-details-textual">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">995484 - Disclosure - Note F - Debt (Details Textual)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-g-economic-dependency-details-textual" roleURI="http://www.nai-online.com/20260331/role/statement-note-g-economic-dependency-details-textual">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">995485 - Disclosure - Note G - Economic Dependency (Details Textual)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-g-economic-dependency-substantial-net-sales-to-certain-customers-details" roleURI="http://www.nai-online.com/20260331/role/statement-note-g-economic-dependency-substantial-net-sales-to-certain-customers-details">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">995486 - Disclosure - Note G - Economic Dependency - Substantial Net Sales to Certain Customers (Details)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-g-economic-dependency-substantial-net-purchase-from-certain-suppliers-details" roleURI="http://www.nai-online.com/20260331/role/statement-note-g-economic-dependency-substantial-net-purchase-from-certain-suppliers-details">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">995487 - Disclosure - Note G - Economic Dependency - Substantial Net Purchase From Certain Suppliers (Details)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-h-segment-information-details-textual" roleURI="http://www.nai-online.com/20260331/role/statement-note-h-segment-information-details-textual">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">995488 - Disclosure - Note H - Segment Information (Details Textual)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-h-segment-information-operating-results-by-business-segment-details" roleURI="http://www.nai-online.com/20260331/role/statement-note-h-segment-information-operating-results-by-business-segment-details">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">995489 - Disclosure - Note H - Segment Information - Operating Results by Business Segment (Details)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-h-segment-information-assets-by-business-segment-details" roleURI="http://www.nai-online.com/20260331/role/statement-note-h-segment-information-assets-by-business-segment-details">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">995490 - Disclosure - Note H - Segment Information - Assets by Business Segment (Details)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-i-income-taxes-details-textual" roleURI="http://www.nai-online.com/20260331/role/statement-note-i-income-taxes-details-textual">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">995491 - Disclosure - Note I - Income Taxes (Details Textual)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-j-treasury-stock-details-textual" roleURI="http://www.nai-online.com/20260331/role/statement-note-j-treasury-stock-details-textual">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">995492 - Disclosure - Note J - Treasury Stock (Details Textual)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-j-treasury-stock-treasury-stock-repurchases-details" roleURI="http://www.nai-online.com/20260331/role/statement-note-j-treasury-stock-treasury-stock-repurchases-details">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">995493 - Disclosure - Note J - Treasury Stock - Treasury Stock Repurchases (Details)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-k-derivatives-and-hedging-details-textual" roleURI="http://www.nai-online.com/20260331/role/statement-note-k-derivatives-and-hedging-details-textual">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">995494 - Disclosure - Note K - Derivatives and Hedging (Details Textual)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-l-contingencies-details-textual" roleURI="http://www.nai-online.com/20260331/role/statement-note-l-contingencies-details-textual">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">995495 - Disclosure - Note L - Contingencies (Details Textual)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
      <link:roleType id="statement-note-m-subsequent-events-details-textual" roleURI="http://www.nai-online.com/20260331/role/statement-note-m-subsequent-events-details-textual">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">995496 - Disclosure - Note M - Subsequent Events (Details Textual)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
      </link:roleType>
    </xsd:appinfo>
  </xsd:annotation>
  <xsd:element abstract="true" id="naii_AccumulatedGainLossNetSwapDerivativeParentMember" name="AccumulatedGainLossNetSwapDerivativeParentMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element id="naii_AccumulatedOtherComprehensiveIncomeLossCumulativeCashFlowHedgesGainLoss" name="AccumulatedOtherComprehensiveIncomeLossCumulativeCashFlowHedgesGainLoss" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant"/>
  <xsd:element abstract="true" id="naii_California1Member" name="California1Member" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element id="naii_ContractWithCustomerLiabilityAddition" name="ContractWithCustomerLiabilityAddition" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration"/>
  <xsd:element id="naii_ContractWithCustomerLiabilityCustomerRefunds" name="ContractWithCustomerLiabilityCustomerRefunds" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration"/>
  <xsd:element id="naii_ContractWithCustomerLiabilityRevenueRecognizedDuringPeriod" name="ContractWithCustomerLiabilityRevenueRecognizedDuringPeriod" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="naii_CreditAgreementMember" name="CreditAgreementMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="naii_Customer1Member" name="Customer1Member" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="naii_Customer2Member" name="Customer2Member" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="naii_Customer3Member" name="Customer3Member" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element id="naii_DeferredCompensationArrangementWithIndividualCashAwardForfeitedAmount" name="DeferredCompensationArrangementWithIndividualCashAwardForfeitedAmount" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="naii_DocumentAndEntityInformation" name="DocumentAndEntityInformation" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="naii_EarlyTerminationOfMannoSwitzerlandApartmentLeaseMember" name="EarlyTerminationOfMannoSwitzerlandApartmentLeaseMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="naii_EmployeeRetentionTaxCreditERTCRefundMember" name="EmployeeRetentionTaxCreditERTCRefundMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="naii_EuroForwardContractMember" name="EuroForwardContractMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="naii_ExtensionOnManufacturingFacilitiesLeaseMember" name="ExtensionOnManufacturingFacilitiesLeaseMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="naii_ForeignExchangeContractEuroSalesMember" name="ForeignExchangeContractEuroSalesMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="naii_ForeignExchangeContractSwissFrancSalesMember" name="ForeignExchangeContractSwissFrancSalesMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element id="naii_IncreaseDecreaseInOperatingLeaseRightOfAssetsAndLiabilitiesNet" name="IncreaseDecreaseInOperatingLeaseRightOfAssetsAndLiabilitiesNet" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="naii_LegacyCorporateLendingLlcMember" name="LegacyCorporateLendingLlcMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="naii_LoanAndSecurityAgreementMember" name="LoanAndSecurityAgreementMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="naii_MannoSwitzerlandMember" name="MannoSwitzerlandMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="naii_NewApartmentInLuganoSwitzerlandMember" name="NewApartmentInLuganoSwitzerlandMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="naii_NoteToFinancialStatementDetailsTextual" name="NoteToFinancialStatementDetailsTextual" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="naii_NotesToFinancialStatements" name="NotesToFinancialStatements" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="naii_NotesToFinancialStatementsAbstract" name="NotesToFinancialStatementsAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element id="naii_OperatingLeaseBaseRentPerSquareFoot" name="OperatingLeaseBaseRentPerSquareFoot" nillable="true" substitutionGroup="xbrli:item" type="xbrli:decimalItemType" xbrli:periodType="instant"/>
  <xsd:element id="naii_OperatingLeaseNoncashExpense" name="OperatingLeaseNoncashExpense" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="naii_PatentAndTrademarkLicensingMember" name="PatentAndTrademarkLicensingMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="naii_PolicyTable" name="PolicyTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="naii_PrivateLabelContractManufacturingMember" name="PrivateLabelContractManufacturingMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element id="naii_RawMaterialPurchasesBySupplier" name="RawMaterialPurchasesBySupplier" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="naii_RawMaterialPurchasesMember" name="RawMaterialPurchasesMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="naii_RefundableTaxCreditsClaimERTCMember" name="RefundableTaxCreditsClaimERTCMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="naii_ReimbursementsForTenantImprovementsMember" name="ReimbursementsForTenantImprovementsMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element id="naii_SalesRoyaltyAndLicensingRevenue" name="SalesRoyaltyAndLicensingRevenue" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration"/>
  <xsd:element id="naii_SharebasedCompensationArrangementBySharebasedPaymentAwardPlanTermExtension" name="SharebasedCompensationArrangementBySharebasedPaymentAwardPlanTermExtension" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="instant"/>
  <xsd:element abstract="true" id="naii_StockRepurchasedFromEmployeeForRestrictedStockVestingMember" name="StockRepurchasedFromEmployeeForRestrictedStockVestingMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="naii_Supplier1Member" name="Supplier1Member" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="naii_SwissFrancForwardContractMember" name="SwissFrancForwardContractMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="naii_TermLoanMember" name="TermLoanMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="naii_The2020OmnibusStockIncentivePlanMember" name="The2020OmnibusStockIncentivePlanMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="naii_WellsFargoBankNAMember" name="WellsFargoBankNAMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="naii_statement-statement-note-a-basis-of-presentation-and-summary-of-significant-accounting-policies-calculation-of-basic-and-diluted-net-income-per-common-share-details" name="statement-statement-note-a-basis-of-presentation-and-summary-of-significant-accounting-policies-calculation-of-basic-and-diluted-net-income-per-common-share-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="naii_statement-statement-note-a-basis-of-presentation-and-summary-of-significant-accounting-policies-contract-liabilities-and-revenue-recognized-details" name="statement-statement-note-a-basis-of-presentation-and-summary-of-significant-accounting-policies-contract-liabilities-and-revenue-recognized-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="naii_statement-statement-note-a-basis-of-presentation-and-summary-of-significant-accounting-policies-fair-value-of-derivative-instruments-classified-as-level-2-assets-and-liabilities-details" name="statement-statement-note-a-basis-of-presentation-and-summary-of-significant-accounting-policies-fair-value-of-derivative-instruments-classified-as-level-2-assets-and-liabilities-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="naii_statement-statement-note-a-basis-of-presentation-and-summary-of-significant-accounting-policies-tables" name="statement-statement-note-a-basis-of-presentation-and-summary-of-significant-accounting-policies-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="naii_statement-statement-note-b-inventories-net-summary-of-inventories-details" name="statement-statement-note-b-inventories-net-summary-of-inventories-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="naii_statement-statement-note-b-inventories-net-tables" name="statement-statement-note-b-inventories-net-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="naii_statement-statement-note-c-property-and-equipment-summary-of-property-and-equipment-details" name="statement-statement-note-c-property-and-equipment-summary-of-property-and-equipment-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="naii_statement-statement-note-c-property-and-equipment-tables" name="statement-statement-note-c-property-and-equipment-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="naii_statement-statement-note-d-other-comprehensive-loss-schedule-of-other-comprehensive-loss-details" name="statement-statement-note-d-other-comprehensive-loss-schedule-of-other-comprehensive-loss-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="naii_statement-statement-note-d-other-comprehensive-loss-tables" name="statement-statement-note-d-other-comprehensive-loss-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="naii_statement-statement-note-e-leases-lease-cash-flow-information-details" name="statement-statement-note-e-leases-lease-cash-flow-information-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="naii_statement-statement-note-e-leases-tables" name="statement-statement-note-e-leases-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="naii_statement-statement-note-g-economic-dependency-substantial-net-purchase-from-certain-suppliers-details" name="statement-statement-note-g-economic-dependency-substantial-net-purchase-from-certain-suppliers-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="naii_statement-statement-note-g-economic-dependency-substantial-net-sales-to-certain-customers-details" name="statement-statement-note-g-economic-dependency-substantial-net-sales-to-certain-customers-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="naii_statement-statement-note-g-economic-dependency-tables" name="statement-statement-note-g-economic-dependency-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="naii_statement-statement-note-h-segment-information-assets-by-business-segment-details" name="statement-statement-note-h-segment-information-assets-by-business-segment-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="naii_statement-statement-note-h-segment-information-operating-results-by-business-segment-details" name="statement-statement-note-h-segment-information-operating-results-by-business-segment-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="naii_statement-statement-note-h-segment-information-tables" name="statement-statement-note-h-segment-information-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="naii_statement-statement-note-j-treasury-stock-tables" name="statement-statement-note-j-treasury-stock-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="naii_statement-statement-note-j-treasury-stock-treasury-stock-repurchases-details" name="statement-statement-note-j-treasury-stock-treasury-stock-repurchases-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="naii_statement-statement-significant-accounting-policies-policies" name="statement-statement-significant-accounting-policies-policies" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
</xsd:schema>
