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Debt - Additional Information (Detail) | 1 Months Ended | 12 Months Ended |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2011 USD ($) | Dec. 31, 2010 USD ($) | Jun. 30, 2012 USD ($) | Dec. 16, 2010 USD ($) | Sep. 22, 2006 Natural Alternatives International Europe Sa USD ($) | Sep. 22, 2006 Natural Alternatives International Europe Sa CHF | Feb. 19, 2007 Natural Alternatives International Europe Sa Amended Line of Credit Facility USD ($) | Feb. 19, 2007 Natural Alternatives International Europe Sa Amended Line of Credit Facility CHF | Jun. 30, 2012 Wells Fargo Foreign Exchange Facility | Jun. 30, 2012 Bank of America, N.A. Foreign Exchange Facility | Jun. 30, 2012 Minimum USD ($) | Jun. 30, 2012 Maximum USD ($) | Sep. 22, 2006 Maximum Natural Alternatives International Europe Sa
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  | $ 5,000,000 |  |  |  |  |  |  |  |  |
Commitment fee | 12,500 | 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 above LIBOR |  |  | 2.75% |  |  |  |  |  |  |  |  |  |
Fixed interest rate above LIBOR |  |  | 2.50% |  |  |  |  |  |  |  |  |  |
Line of credit facility full payment period |  |  | Nov. 01, 2013 |  |  |  |  |  |  |  |  |  |
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, 2013 | Mar. 15, 2013 |  |  |
Maximum aggregate amount outstanding at any one time under credit facility |  |  |  |  | 1,400,000 | 1,300,000 | 523,000 | 500,000 |  |  |  |  |
Annual reduction of maximum amount outstanding under the credit facility |  |  |  |  | 167,000 | 160,000 |  |  |  |  |  |  |
Line of credit facility, drawing term |  |  |  |  |  |  |  |  |  |  |  |  | 24 months
Current account loans interest rate |  |  |  |  | 5.00% | 5.00% |  |  |  |  |  |  |
Pre-payment penalty on fixed loan |  |  |  |  | 0.10% | 0.10% |  |  |  |  |  |  |
Debt pre-payment penalty |  |  |  |  | 1,047 | 1,000 |  |  |  |  |  |  |
Outstanding amount available under credit facilities |  |  | $ 5,500,000 |  |  |  |  |  |  |  |  |  |

X
- Definition The percentage points added to the reference rate to compute fixed rate elections on the debt instrument. + References No definition available. + Details
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- Definition Debt Pre Payment Penalty + References No definition available. + Details
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- Definition Debt Prepayment Penalty Rate + References No definition available. + Details
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- Definition Debt to Equity Ratio + References No definition available. + Details
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- Definition Line of Credit Covenant, Number of Consecutive Days That Outstanding Balance Must be Zero + References No definition available. + Details
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- Definition Date the credit facility terminates, in CCYY-MM-DD format. + References No definition available. + Details
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- Definition Maximum term for fixed loans under Line of Credit Facility. + References No definition available. + Details
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- Definition Balance required to be maintained for a minimum period of time as required by Line of Credit Facility. + References No definition available. + Details
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- Definition Minimum Prepayment Amount Under Line of Credit + References No definition available. + Details
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- Definition The percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 21 -Paragraph 16, 20 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 + Details
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- Definition The average effective interest rate during the reporting period. + 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 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 3: 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
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- Details
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- Definition Date when the debt instrument is scheduled to be fully repaid, which may be presented in a variety of ways (year, month and year, day, month and year, quarter, etc.). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: 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
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- 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Net increase or decrease in the carrying amount of the debt instrument for the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 4 -Section 08 -Paragraph f Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(f)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690 + Details
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- Definition Maximum amount borrowed under the credit facility at any time during the period. + References No definition available. + Details
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- 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 Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. 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 Reference 3: 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 + Details
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