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Note H - Segment Information - Assets by Business Segment (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Jun. 30, 2014
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Total Assets |  |
Assets | $ 54,099 us-gaap_Assets | $ 52,258 us-gaap_Assets
Private Label Contract Manufacturing [Member] |  |
Total Assets |  |
Assets | 51,029 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = naii_PrivateLabelContractManufacturingMember | 50,424 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = naii_PrivateLabelContractManufacturingMember
Patent and Trademark Licensing [Member] |  |
Total Assets |  |
Assets | 3,070 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = naii_PatentAndTrademarkLicensingMember | 1,632 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = naii_PatentAndTrademarkLicensingMember
Branded Products [Member] |  |
Total Assets |  |
Assets |  | $ 202 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = naii_BrandedProductsMember

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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.18) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 18 -Article 5 + Details
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