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Note K - Derivatives and Hedging (Details Textual) | 9 Months Ended |  |  |  |  | 3 Months Ended | 9 Months Ended
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Mar. 31, 2015 USD ($) | Mar. 31, 2015 Cash Flow Hedging Foreign Exchange Contract [Member] USD ($) | Mar. 31, 2015 Cash Flow Hedging Foreign Exchange Contract [Member] EUR (€) | Mar. 31, 2015 Prepaid Expenses and Other Current Assets [Member] USD ($) | Jun. 30, 2014 Prepaid Expenses and Other Current Assets [Member] USD ($) | Mar. 31, 2015 Other Noncurrent Assets [Member] USD ($) | Jun. 30, 2014 Other Noncurrent Assets Net [Member] USD ($) | Jun. 30, 2014 Accrued Liabilities [Member] USD ($) | Mar. 31, 2015 Cash Flow Hedging [Member] USD ($) | Mar. 31, 2014 Cash Flow Hedging [Member] USD ($) | Mar. 31, 2015 Cash Flow Hedging [Member] USD ($) | Mar. 31, 2014 Cash Flow Hedging [Member] USD ($)
Derivative, Notional Amount |  | $ 16,000,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = naii_CashFlowHedgingForeignExchangeContractMember | € 13,000,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = naii_CashFlowHedgingForeignExchangeContractMember |  |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax | 1,200,000 us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax |  |  |  |  |  |  |  |  |  |  |
Cash Flow Hedge Derivative Instrument Assets at Fair Value |  |  |  | 1,900,000 us-gaap_CashFlowHedgeDerivativeInstrumentAssetsAtFairValue / us-gaap_BalanceSheetLocationAxis = us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember | 46,000 us-gaap_CashFlowHedgeDerivativeInstrumentAssetsAtFairValue / us-gaap_BalanceSheetLocationAxis = us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember | 26,000 us-gaap_CashFlowHedgeDerivativeInstrumentAssetsAtFairValue / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentAssetsMember | 4,000 us-gaap_CashFlowHedgeDerivativeInstrumentAssetsAtFairValue / us-gaap_BalanceSheetLocationAxis = naii_OtherNoncurrentAssetsNetMember | 74,000 us-gaap_CashFlowHedgeDerivativeInstrumentAssetsAtFairValue / us-gaap_BalanceSheetLocationAxis = naii_AccruedLiabilities1Member |  |  |  |
Derivative Instruments, Gain Recognized in Other Comprehensive Income (Loss), Effective Portion |  |  |  |  |  |  |  |  | 939,000 us-gaap_DerivativeInstrumentsGainRecognizedInOtherComprehensiveIncomeEffectivePortion / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember | 35,000 us-gaap_DerivativeInstrumentsGainRecognizedInOtherComprehensiveIncomeEffectivePortion / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember | 2,700,000 us-gaap_DerivativeInstrumentsGainRecognizedInOtherComprehensiveIncomeEffectivePortion / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember |
Derivative Instruments, Gain Reclassified from Accumulated OCI into Income, Effective Portion |  |  |  |  |  |  |  |  | 875,000 us-gaap_DerivativeInstrumentsGainReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortion / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember |  | 1,500,000 us-gaap_DerivativeInstrumentsGainReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortion / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember |
Derivative Instruments, Loss Reclassified from Accumulated OCI into Income, Effective Portion |  |  |  |  |  |  |  |  |  | 116,000 us-gaap_DerivativeInstrumentsLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortion / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember |  | 361,000 us-gaap_DerivativeInstrumentsLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortion / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember
Derivative Instruments, Loss Recognized in Other Comprehensive Income (Loss), Effective Portion |  |  |  |  |  |  |  |  |  |  |  | $ 533,000 us-gaap_DerivativeInstrumentsLossRecognizedInOtherComprehensiveIncomeEffectivePortion / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Fair value of all asset derivatives designated as cash flow hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624163-113959 + Details
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- Definition The effective portion of gain reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 + Details
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- Definition The effective portion of gains on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 + Details
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- Definition The effective portion of loss reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 + Details
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- Definition The effective portion of losses on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 + Details
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- Definition Amount after tax and reclassification adjustments, of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580 + Details
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