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Note H - Segment Information - Assets by Business Segment (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Jun. 30, 2014
Total Assets    
Assets $ 51,634us-gaap_Assets $ 52,258us-gaap_Assets
Branded Products [Member]    
Total Assets    
Assets 78us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= naii_BrandedProductsMember		 202us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= naii_BrandedProductsMember
Patentand Trademark Licensing [Member]    
Total Assets    
Assets 1,453us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= naii_PatentandTrademarkLicensingMember		 1,632us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= naii_PatentandTrademarkLicensingMember
Private Label Contract Manufacturing [Member]    
Total Assets    
Assets $ 50,103us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= naii_PrivateLabelContractManufacturingMember		 $ 50,424us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= naii_PrivateLabelContractManufacturingMember