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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		6 Months Ended		0 Months Ended					1 Months Ended		0 Months Ended	3 Months Ended	12 Months Ended
	Oct. 03, 2012	Jan. 31, 2012	Jun. 30, 2011	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Jul. 01, 2013	Jun. 01, 2013	Dec. 01, 2012	Jul. 12, 2012	Mar. 13, 2012	Mar. 31, 2014	Mar. 31, 2012	Mar. 07, 2014	Sep. 30, 2013	Jun. 30, 2013	Jun. 30, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Proceeds from License Fees Received	$ 150,000us-gaap_ProceedsFromLicenseFeesReceived	$ 300,000us-gaap_ProceedsFromLicenseFeesReceived	$ 300,000us-gaap_ProceedsFromLicenseFeesReceived
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Royalty Expense				206,000us-gaap_RoyaltyExpense	143,000us-gaap_RoyaltyExpense	380,000us-gaap_RoyaltyExpense	380,000us-gaap_RoyaltyExpense
Allocated Share-based Compensation Expense				84,000us-gaap_AllocatedShareBasedCompensationExpense	54,000us-gaap_AllocatedShareBasedCompensationExpense	167,000us-gaap_AllocatedShareBasedCompensationExpense	102,000us-gaap_AllocatedShareBasedCompensationExpense
Amendment [Member]
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Proceeds from License Fees Received								150,000us-gaap_ProceedsFromLicenseFeesReceived / us-gaap_StatementScenarioAxis = naii_AmendmentMember	204,167us-gaap_ProceedsFromLicenseFeesReceived / us-gaap_StatementScenarioAxis = naii_AmendmentMember	204,167us-gaap_ProceedsFromLicenseFeesReceived / us-gaap_StatementScenarioAxis = naii_AmendmentMember	354,167us-gaap_ProceedsFromLicenseFeesReceived / us-gaap_StatementScenarioAxis = naii_AmendmentMember	354,167us-gaap_ProceedsFromLicenseFeesReceived / us-gaap_StatementScenarioAxis = naii_AmendmentMember
Additional License Fees Upon Achievement of Certain Milestones													2,800,000naii_AdditionalLicenseFeesUponAchievementOfCertainMilestones / us-gaap_StatementScenarioAxis = naii_AmendmentMember
Additional License Fees Receivable Upon Achievement of Certain Milestones					150,000naii_AdditionalLicenseFeesReceivableUponAchievementOfCertainMilestones / us-gaap_StatementScenarioAxis = naii_AmendmentMember		150,000naii_AdditionalLicenseFeesReceivableUponAchievementOfCertainMilestones / us-gaap_StatementScenarioAxis = naii_AmendmentMember
Installment [Member]
Organization, Consolidation and Presentation of Financial Statements [Abstract]
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Prior to Amendment [Member]
Organization, Consolidation and Presentation of Financial Statements [Abstract]
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Additional License Fees Receivable Upon Achievement of Certain Milestones												708,334naii_AdditionalLicenseFeesReceivableUponAchievementOfCertainMilestones / us-gaap_StatementScenarioAxis = naii_PriorToAmendmentMember
2009 Omnibus Stock Incentive Plan [Member]
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period															105,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_PlanNameAxis = naii_OmnibusStockIncentivePlan2009Member		98,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_PlanNameAxis = naii_OmnibusStockIncentivePlan2009Member
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period															3 years		3 years
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period																10,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod / us-gaap_PlanNameAxis = naii_OmnibusStockIncentivePlan2009Member
Fair Value, Inputs, Level 1 [Member]
Organization, Consolidation and Presentation of Financial Statements [Abstract]
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Fair Value, Inputs, Level 2 [Member]
Organization, Consolidation and Presentation of Financial Statements [Abstract]
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Foreign Currency Contracts, Liability, Fair Value Disclosure																		24,000us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Fair Value, Inputs, Level 3 [Member]
Organization, Consolidation and Presentation of Financial Statements [Abstract]
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Employee Stock Option [Member]
Organization, Consolidation and Presentation of Financial Statements [Abstract]
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
Restricted Stock [Member] | 2009 Omnibus Stock Incentive Plan [Member]
Organization, Consolidation and Presentation of Financial Statements [Abstract]
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Equity Option [Member]
Organization, Consolidation and Presentation of Financial Statements [Abstract]
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