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Note 9 - Stock-based Compensation (Detail) - Stock Options By Exercise Prices Range (USD $)
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12 Months Ended |
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Mar. 31, 2013
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| Number of Options (in Shares) | 145,000 |
| Weighted Avg. Remaining Contractual Life in Years | 8 years 324 days |
| Weighted Avg. Exercise Price of Options Outstanding | $ 5.23 |
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Exercise Price of $4.81 [Member]
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| Exercise price | $ 4.81 |
| Number of Options (in Shares) | 45,000 |
| Weighted Avg. Remaining Contractual Life in Years | 8 years 69 days |
| Weighted Avg. Exercise Price of Options Outstanding | $ 4.81 |
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Exercise Price of $5.42 [Member]
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| Exercise price | $ 5.42 |
| Number of Options (in Shares) | 100,000 |
| Weighted Avg. Remaining Contractual Life in Years | 9 years 73 days |
| Weighted Avg. Exercise Price of Options Outstanding | $ 5.42 |
| X | ||||||||||
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- Definition
The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Weighted average remaining contractual term of outstanding stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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