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v2.4.1.9

Note E - Debt (Details Textual) | 9 Months Ended |  |  | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2015 USD ($) | Feb. 19, 2007 USD ($) | Mar. 31, 2015 Maximum [Member] | Mar. 31, 2015 Minimum [Member] | Mar. 31, 2015 London Interbank Offered Rate (LIBOR) [Member] | Mar. 31, 2015 Natural Alternatives International Europe SA [Member] Fixed Loans [Member] USD ($) | Mar. 31, 2015 Natural Alternatives International Europe SA [Member] Fixed Loans [Member] CHF | Mar. 31, 2015 Natural Alternatives International Europe SA [Member] | Feb. 19, 2007 Natural Alternatives International Europe SA [Member] CHF | Sep. 22, 2006 Natural Alternatives International Europe SA [Member] USD ($) | Sep. 22, 2006 Natural Alternatives International Europe SA [Member] CHF
Line of Credit Facility, Maximum Borrowing Capacity | $ 5,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity |  |  |  |  |  |  |  |  | $ 1,300,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / dei_LegalEntityAxis = naii_NaturalAlternativesInternationalEuropeSaMember | 1,300,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / dei_LegalEntityAxis = naii_NaturalAlternativesInternationalEuropeSaMember
Line of Credit Facility, Commitment Fee Amount | 10,000 us-gaap_LineOfCreditFacilityCommitmentFeeAmount |  |  |  |  |  |  |  |  |  |
Net Income Required in Future for Income Covenant | 750,000 naii_NetIncomeRequiredInFutureForIncomeCovenant |  |  |  |  |  |  |  |  |  |
Long-term Line of Credit | 0 us-gaap_LineOfCredit |  |  |  |  |  |  |  |  |  |
Ratio of Indebtedness to Net Capital |  |  | 1.25 us-gaap_RatioOfIndebtednessToNetCapital1 / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |  |  |  |  |
Long-term Debt, Percentage Bearing Variable Interest, Amount | 100,000 us-gaap_LongtermDebtPercentageBearingVariableInterestAmount |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  | 1.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |  |  |  |  |  |
Debt Instrument Basis Spread on Elected Fixed Rate Borrowing |  |  |  |  | 1.75%naii_DebtInstrumentBasisSpreadOnElectedFixedRateBorrowing / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |  |  |  |  |  |
Line of Credit Facility Outstanding Daily Balance During Period | 0 naii_LineOfCreditFacilityOutstandingDailyBalanceDuringPeriod |  |  |  |  |  |  |  |  |  |
Line of Credit Covenant Number of Consecutive Days That Outstanding Balance Must Be Zero |  |  |  | 30 days |  |  |  |  |  |  |
Minimum Prepayment Amount Under Line of Credit | 100,000 naii_MinimumPrepaymentAmountUnderLineOfCredit |  |  |  |  |  |  |  |  |  |
Line of Credit Facility Maximum Borrowing Capacity Annual Reduction |  |  |  |  |  |  |  |  |  | 166,000 naii_LineOfCreditFacilityMaximumBorrowingCapacityAnnualReduction / dei_LegalEntityAxis = naii_NaturalAlternativesInternationalEuropeSaMember | 160,000 naii_LineOfCreditFacilityMaximumBorrowingCapacityAnnualReduction / dei_LegalEntityAxis = naii_NaturalAlternativesInternationalEuropeSaMember
Line of Credit Facility Maximum Amount Outstanding after Reduction |  | 518,000 naii_LineOfCreditFacilityMaximumAmountOutstandingAfterReduction |  |  |  |  |  |  | 500,000 naii_LineOfCreditFacilityMaximumAmountOutstandingAfterReduction / dei_LegalEntityAxis = naii_NaturalAlternativesInternationalEuropeSaMember |  |
Debt Instrument, Term |  |  |  |  |  |  |  | 2 years |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  | 5.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / dei_LegalEntityAxis = naii_NaturalAlternativesInternationalEuropeSaMember |  |  |
Debt Prepayment Penalty Rate |  |  |  |  |  | 0.10%naii_DebtPrepaymentPenaltyRate / us-gaap_DebtInstrumentAxis = naii_FixedLoansMember / dei_LegalEntityAxis = naii_NaturalAlternativesInternationalEuropeSaMember | 0.10%naii_DebtPrepaymentPenaltyRate / us-gaap_DebtInstrumentAxis = naii_FixedLoansMember / dei_LegalEntityAxis = naii_NaturalAlternativesInternationalEuropeSaMember |  |  |  |
Debt Pre Payment Penalty |  |  |  |  |  | 1,037 naii_DebtPrePaymentPenalty / us-gaap_DebtInstrumentAxis = naii_FixedLoansMember / dei_LegalEntityAxis = naii_NaturalAlternativesInternationalEuropeSaMember | 1,000 naii_DebtPrePaymentPenalty / us-gaap_DebtInstrumentAxis = naii_FixedLoansMember / dei_LegalEntityAxis = naii_NaturalAlternativesInternationalEuropeSaMember |  |  |  |
Line of Credit Facility, Current Borrowing Capacity | $ 5,500,000 us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity |  |  |  |  |  |  |  |  |  |

X
- Definition The percentage points added to the reference rate to compute fixed rate elections on the debt instrument. + References No definition available. + Details
Name: | naii_DebtInstrumentBasisSpreadOnElectedFixedRateBorrowing
Namespace Prefix: | naii_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of penalties associated with the prepayment of debt. + References No definition available. + Details
Name: | naii_DebtPrePaymentPenalty
Namespace Prefix: | naii_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Percentage of penalties associated with the prepayment of debt. + References No definition available. + Details
Name: | naii_DebtPrepaymentPenaltyRate
Namespace Prefix: | naii_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of consecutive days that the outstanding balance must be zero on a line of credit as part of the agreement. + References No definition available. + Details
Name: | naii_LineOfCreditCovenantNumberOfConsecutiveDaysThatOutstandingBalanceMustBeZero
Namespace Prefix: | naii_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Maximum amount outstanding after an annual reduction on a line of credit facility. + References No definition available. + Details
Name: | naii_LineOfCreditFacilityMaximumAmountOutstandingAfterReduction
Namespace Prefix: | naii_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of annual reduction on a line of credit facility. + References No definition available. + Details
Name: | naii_LineOfCreditFacilityMaximumBorrowingCapacityAnnualReduction
Namespace Prefix: | naii_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount that a balance for a line of credit must be maintained at for a predetermined amount of days as part of the agreement. + References No definition available. + Details
Name: | naii_LineOfCreditFacilityOutstandingDailyBalanceDuringPeriod
Namespace Prefix: | naii_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The minimum payment amount that may be prepaid on a line of credit facility with a fixed interest rate. + References No definition available. + Details
Name: | naii_MinimumPrepaymentAmountUnderLineOfCredit
Namespace Prefix: | naii_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of net income after taxes that must be maintained by the borrower in a line of credit facility. + References No definition available. + Details
Name: | naii_NetIncomeRequiredInFutureForIncomeCovenant
Namespace Prefix: | naii_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentTerm
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
Name: | us-gaap_LineOfCredit
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of the fee for available but unused credit capacity under the credit facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
Name: | us-gaap_LineOfCreditFacilityCommitmentFeeAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
Name: | us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
Name: | us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a rate subject to change from time to time. + References No definition available. + Details
Name: | us-gaap_LongtermDebtPercentageBearingVariableInterestAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Indebtedness divided by net capital. + References No definition available. + Details
Name: | us-gaap_RatioOfIndebtednessToNetCapital1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant