XML 32 R32.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Debt - Additional Information (Detail) | 3 Months Ended |  | 3 Months Ended |  | 3 Months Ended |  | 1 Months Ended |  | 1 Months Ended |  | 3 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2013 USD ($) | Dec. 16, 2010 USD ($) | Sep. 30, 2013 Minimum USD ($) | Sep. 30, 2013 Maximum USD ($) | Sep. 30, 2013 Foreign Exchange Facility Wells Fargo | Sep. 30, 2013 Foreign Exchange Facility Bank of America, N.A. | Sep. 22, 2006 Natural Alternatives International Europe Sa USD ($) | Sep. 22, 2006 Natural Alternatives International Europe Sa CHF | Sep. 22, 2006 Natural Alternatives International Europe Sa Maximum | Sep. 22, 2006 Natural Alternatives International Europe Sa Current Account Loans | Sep. 22, 2006 Natural Alternatives International Europe Sa Fixed Loans USD ($) | Sep. 22, 2006 Natural Alternatives International Europe Sa Fixed Loans CHF | Feb. 19, 2007 Natural Alternatives International Europe Sa Amended Line of Credit Facility USD ($) | Feb. 19, 2007 Natural Alternatives International Europe Sa Amended Line of Credit Facility CHF | Sep. 30, 2013 London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  | $ 5,000,000 |  |  |  |  | $ 1,400,000 | 1,300,000 |  |  |  |  |  |  |
Commitment fee | 12,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income after taxes to maintain credit agreement eligibility |  |  | 750,000 |  |  |  |  |  |  |  |  |  |  |  |
Ratio of total liabilities to tangible net worth |  |  |  | 1.25 |  |  |  |  |  |  |  |  |  |  |
Principal amount that bears fluctuating rate of interest |  |  |  | 100,000 |  |  |  |  |  |  |  |  |  |  |
Variable interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.75%
Fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.50%
Line of credit facility full payment period | Nov. 01, 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding balance to maintain under line of credit for period of at least 30 consecutive days | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period to maintain zero balance under line of credit |  |  | 30 days |  |  |  |  |  |  |  |  |  |  |  |
Prepayment amount of line of credit outstanding subject to fixed interest rate | 100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign exchange facility, expiration date |  |  |  |  | Nov. 01, 2014 | Mar. 05, 2014 |  |  |  |  |  |  |  |  |
Annual reduction of maximum amount outstanding under the credit facility |  |  |  |  |  |  | 177,000 | 160,000 |  |  |  |  |  |  |
Maximum aggregate amount that may be outstanding under credit facility after reduction |  |  |  |  |  |  |  |  |  |  |  |  | 552,000 | 500,000 |
Line of credit facility, drawing term |  |  |  |  |  |  |  |  | 24 months |  |  |  |  |  |
Debt instrument, interest rate |  |  |  |  |  |  |  |  |  | 5.00% |  |  |  |  |
Pre-payment penalty rate |  |  |  |  |  |  |  |  |  |  | 0.10% | 0.10% |  |  |
Minimum pre-payment penalty amount |  |  |  |  |  |  |  |  |  |  | 1,103 | 1,000 |  |  |
Outstanding amount available under credit facilities | $ 5,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |

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 Debt Pre Payment Penalty + References No definition available. + Details
Name: | naii_DebtPrePaymentPenalty
Namespace Prefix: | naii_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Debt Prepayment Penalty Rate + References No definition available. + Details
Name: | naii_DebtPrepaymentPenaltyRate
Namespace Prefix: | naii_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line of Credit Covenant, Number of Consecutive Days That Outstanding Balance Must be Zero + References No definition available. + Details
Name: | naii_LineOfCreditCovenantNumberOfConsecutiveDaysThatOutstandingBalanceMustBeZero
Namespace Prefix: | naii_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line of Credit Facility, Maximum Amount Outstanding After Reduction + References No definition available. + Details
Name: | naii_LineOfCreditFacilityMaximumAmountOutstandingAfterReduction
Namespace Prefix: | naii_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Line of Credit Facility, Maximum Borrowing Capacity, Annual Reduction + References No definition available. + Details
Name: | naii_LineOfCreditFacilityMaximumBorrowingCapacityAnnualReduction
Namespace Prefix: | naii_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Balance required to be maintained for a minimum period of time as required by Line of Credit Facility. + References No definition available. + Details
Name: | naii_LineOfCreditFacilityOutstandingDailyBalanceDuringPeriod
Namespace Prefix: | naii_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Minimum Prepayment Amount Under Line of Credit + References No definition available. + Details
Name: | naii_MinimumPrepaymentAmountUnderLineOfCredit
Namespace Prefix: | naii_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Net Income Required In Future For Income Covenant + 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
- Details
Name: | us-gaap_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + 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)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentMaturityDate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

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 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 Date the credit facility terminates, in CCYY-MM-DD format. + 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_LineOfCreditFacilityExpirationDate1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

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