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Note H - Segment Information - Operating Results by Business Segment (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014
Net Sales
Net Sales	$ 19,613us-gaap_SalesRevenueNet	$ 19,127us-gaap_SalesRevenueNet	$ 56,926us-gaap_SalesRevenueNet	$ 52,757us-gaap_SalesRevenueNet
Income from Operations
Income from Operations	1,039us-gaap_OperatingIncomeLoss	1,168us-gaap_OperatingIncomeLoss	2,989us-gaap_OperatingIncomeLoss	1,522us-gaap_OperatingIncomeLoss
Private Label Contract Manufacturing [Member] | Operating Segments [Member]
Income from Operations
Income from Operations	963us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = naii_PrivateLabelContractManufacturingMember	1,717us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = naii_PrivateLabelContractManufacturingMember	3,874us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = naii_PrivateLabelContractManufacturingMember	3,434us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = naii_PrivateLabelContractManufacturingMember
Private Label Contract Manufacturing [Member]
Net Sales
Net Sales	17,322us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = naii_PrivateLabelContractManufacturingMember	17,692us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = naii_PrivateLabelContractManufacturingMember	51,519us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = naii_PrivateLabelContractManufacturingMember	48,056us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = naii_PrivateLabelContractManufacturingMember
Patent and Trademark Licensing [Member] | Operating Segments [Member]
Income from Operations
Income from Operations	1,355us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = naii_PatentAndTrademarkLicensingMember	570us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = naii_PatentAndTrademarkLicensingMember	2,720us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = naii_PatentAndTrademarkLicensingMember	1,500us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = naii_PatentAndTrademarkLicensingMember
Patent and Trademark Licensing [Member]
Net Sales
Net Sales	2,290us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = naii_PatentAndTrademarkLicensingMember	1,141us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = naii_PatentAndTrademarkLicensingMember	4,709us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = naii_PatentAndTrademarkLicensingMember	3,812us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = naii_PatentAndTrademarkLicensingMember
Branded Products [Member] | Operating Segments [Member]
Income from Operations
Income from Operations	4us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = naii_BrandedProductsMember	46us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = naii_BrandedProductsMember	248us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = naii_BrandedProductsMember	61us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = naii_BrandedProductsMember
Branded Products [Member]
Net Sales
Net Sales	1us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = naii_BrandedProductsMember	294us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = naii_BrandedProductsMember	698us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = naii_BrandedProductsMember	889us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = naii_BrandedProductsMember
Operating Segments [Member]
Income from Operations
Income from Operations	2,322us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember	2,333us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember	6,842us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember	4,995us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember
Corporate, Non-Segment [Member]
Income from Operations
Income from Operations	$ (1,283)us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember	$ (1,165)us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember	$ (3,853)us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember	$ (3,473)us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688



Reference 2: http://www.xbrl.org/2003/role/presentationRef

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