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Note A - Basis of Presentation and Summary of Significant Accounting Policies (Details Textual) (USD $) | 0 Months Ended | 1 Months Ended | 3 Months Ended | 9 Months Ended | 0 Months Ended | 1 Months Ended | 0 Months Ended | 3 Months Ended | 12 Months Ended |  |
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Oct. 03, 2012 | Jan. 31, 2012 | Jun. 30, 2011 | Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2015 | Mar. 31, 2014 | Jul. 01, 2013 | Jun. 01, 2013 | Dec. 01, 2012 | Jul. 12, 2012 | Mar. 13, 2012 | Mar. 31, 2014 | Mar. 31, 2012 | Mar. 19, 2015 | Mar. 07, 2014 | Sep. 30, 2013 | Jun. 30, 2013 | Dec. 01, 2013 | Jun. 30, 2014
Proceeds from License Fees Received | $ 150,000 us-gaap_ProceedsFromLicenseFeesReceived | $ 300,000 us-gaap_ProceedsFromLicenseFeesReceived | $ 300,000 us-gaap_ProceedsFromLicenseFeesReceived |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Royalty and Licensing Revenue |  |  |  | 2,300,000 naii_RoyaltyAndLicensingRevenue | 1,100,000 naii_RoyaltyAndLicensingRevenue | 4,700,000 naii_RoyaltyAndLicensingRevenue | 3,800,000 naii_RoyaltyAndLicensingRevenue |  |  |  |  |  |  |  |  |  |  |  |  |
Royalty Expense |  |  |  | 270,000 us-gaap_RoyaltyExpense | 143,000 us-gaap_RoyaltyExpense | 650,000 us-gaap_RoyaltyExpense | 523,000 us-gaap_RoyaltyExpense |  |  |  |  |  |  |  |  |  |  |  |  |
Allocated Share-based Compensation Expense |  |  |  | 92,000 us-gaap_AllocatedShareBasedCompensationExpense | 46,000 us-gaap_AllocatedShareBasedCompensationExpense | 259,000 us-gaap_AllocatedShareBasedCompensationExpense | 148,000 us-gaap_AllocatedShareBasedCompensationExpense |  |  |  |  |  |  |  |  |  |  |  |  |
Amendment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from License Fees Received |  |  |  |  |  |  |  | 150,000 us-gaap_ProceedsFromLicenseFeesReceived / us-gaap_StatementScenarioAxis = naii_AmendmentMember | 204,167 us-gaap_ProceedsFromLicenseFeesReceived / us-gaap_StatementScenarioAxis = naii_AmendmentMember | 204,167 us-gaap_ProceedsFromLicenseFeesReceived / us-gaap_StatementScenarioAxis = naii_AmendmentMember | 354,167 us-gaap_ProceedsFromLicenseFeesReceived / us-gaap_StatementScenarioAxis = naii_AmendmentMember | 354,167 us-gaap_ProceedsFromLicenseFeesReceived / us-gaap_StatementScenarioAxis = naii_AmendmentMember |  |  |  |  |  |  |  |
Additional License Fees Upon Achievement of Certain Milestones |  |  |  |  | 2,800,000 naii_AdditionalLicenseFeesUponAchievementOfCertainMilestones / us-gaap_StatementScenarioAxis = naii_AmendmentMember |  | 2,800,000 naii_AdditionalLicenseFeesUponAchievementOfCertainMilestones / us-gaap_StatementScenarioAxis = naii_AmendmentMember |  |  |  |  |  | 2,800,000 naii_AdditionalLicenseFeesUponAchievementOfCertainMilestones / us-gaap_StatementScenarioAxis = naii_AmendmentMember |  |  |  |  |  |  |
Additional License Fees Receivable Upon Achievement of Certain Milestones |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 150,000 naii_AdditionalLicenseFeesReceivableUponAchievementOfCertainMilestones / us-gaap_StatementScenarioAxis = naii_AmendmentMember |
Prior to Amendment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional License Fees Upon Achievement of Certain Milestones |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,300,000 naii_AdditionalLicenseFeesUponAchievementOfCertainMilestones / us-gaap_StatementScenarioAxis = naii_PriorToAmendmentMember |  |  |  |  |  |
Additional License Fees Receivable Upon Achievement of Certain Milestones |  |  |  |  |  |  |  |  |  |  |  |  |  | 708,334 naii_AdditionalLicenseFeesReceivableUponAchievementOfCertainMilestones / us-gaap_StatementScenarioAxis = naii_PriorToAmendmentMember |  |  |  |  |  |
Installment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Installment Payments |  |  |  |  |  |  |  |  |  |  |  |  | 4 naii_NumberOfInstallmentPayments / us-gaap_StatementScenarioAxis = naii_InstallmentMember | 6 naii_NumberOfInstallmentPayments / us-gaap_StatementScenarioAxis = naii_InstallmentMember |  |  |  |  |  |
Fair Value, Inputs, Level 1 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Net Asset (Liability) |  |  |  | 0 us-gaap_FairValueNetAssetLiability / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member |  | 0 us-gaap_FairValueNetAssetLiability / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 us-gaap_FairValueNetAssetLiability / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Net Asset (Liability) |  |  |  | 0 us-gaap_FairValueNetAssetLiability / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |  | 0 us-gaap_FairValueNetAssetLiability / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 us-gaap_FairValueNetAssetLiability / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Fair Value, Inputs, Level 2 [Member] | Foreign Exchange Forward [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Net Asset (Liability) |  |  |  | $ 1,900,000 us-gaap_FairValueNetAssetLiability / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |  | $ 1,900,000 us-gaap_FairValueNetAssetLiability / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (24,000)us-gaap_FairValueNetAssetLiability / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
2009 Omnibus Stock Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 years | 3 years |  | 3 years |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 105,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_PlanNameAxis = naii_OmnibusStockIncentivePlan2009Member | 105,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_PlanNameAxis = naii_OmnibusStockIncentivePlan2009Member |  | 98,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_PlanNameAxis = naii_OmnibusStockIncentivePlan2009Member |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod / us-gaap_PlanNameAxis = naii_OmnibusStockIncentivePlan2009Member |  |  |
Equity Option [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount |  |  |  | 150,000 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_StockOptionMember | 280,019 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_StockOptionMember | 153,000 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_StockOptionMember | 303,929 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_StockOptionMember |  |  |  |  |  |  |  |  |  |  |  |  |
Employee Stock Option [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate |  |  |  |  |  | 0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  |  |  |  |  |  |  |  |  |  |  |

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