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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 | $ 19,613 us-gaap_SalesRevenueNet | $ 19,127 us-gaap_SalesRevenueNet | $ 56,926 us-gaap_SalesRevenueNet | $ 52,757 us-gaap_SalesRevenueNet
Income from Operations |  |  |  |
Income from Operations | 1,039 us-gaap_OperatingIncomeLoss | 1,168 us-gaap_OperatingIncomeLoss | 2,989 us-gaap_OperatingIncomeLoss | 1,522 us-gaap_OperatingIncomeLoss
Private Label Contract Manufacturing [Member] | Operating Segments [Member] |  |  |  |
Income from Operations |  |  |  |
Income from Operations | 963 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = naii_PrivateLabelContractManufacturingMember | 1,717 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = naii_PrivateLabelContractManufacturingMember | 3,874 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = naii_PrivateLabelContractManufacturingMember | 3,434 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = naii_PrivateLabelContractManufacturingMember
Private Label Contract Manufacturing [Member] |  |  |  |
Net Sales |  |  |  |
Net Sales | 17,322 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = naii_PrivateLabelContractManufacturingMember | 17,692 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = naii_PrivateLabelContractManufacturingMember | 51,519 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = naii_PrivateLabelContractManufacturingMember | 48,056 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = naii_PrivateLabelContractManufacturingMember
Patent and Trademark Licensing [Member] | Operating Segments [Member] |  |  |  |
Income from Operations |  |  |  |
Income from Operations | 1,355 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = naii_PatentAndTrademarkLicensingMember | 570 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = naii_PatentAndTrademarkLicensingMember | 2,720 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = naii_PatentAndTrademarkLicensingMember | 1,500 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = naii_PatentAndTrademarkLicensingMember
Patent and Trademark Licensing [Member] |  |  |  |
Net Sales |  |  |  |
Net Sales | 2,290 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = naii_PatentAndTrademarkLicensingMember | 1,141 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = naii_PatentAndTrademarkLicensingMember | 4,709 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = naii_PatentAndTrademarkLicensingMember | 3,812 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = naii_PatentAndTrademarkLicensingMember
Branded Products [Member] | Operating Segments [Member] |  |  |  |
Income from Operations |  |  |  |
Income from Operations | 4 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = naii_BrandedProductsMember | 46 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = naii_BrandedProductsMember | 248 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = naii_BrandedProductsMember | 61 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = naii_BrandedProductsMember
Branded Products [Member] |  |  |  |
Net Sales |  |  |  |
Net Sales | 1 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = naii_BrandedProductsMember | 294 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = naii_BrandedProductsMember | 698 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = naii_BrandedProductsMember | 889 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = naii_BrandedProductsMember
Operating Segments [Member] |  |  |  |
Income from Operations |  |  |  |
Income from Operations | 2,322 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember | 2,333 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember | 6,842 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember | 4,995 us-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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