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Note 9 - Stock-based Compensation (Details) - Summary of Unvested Options (USD $) | 12 Months Ended |
--- | --- | ---
Mar. 31, 2014 | Mar. 31, 2013 | Mar. 31, 2012 | Mar. 31, 2011
Summary of Unvested Options [Abstract] |  |  |  |
Unvested Options | 257,347 | 257,805 | 284,875 | 291,425
Unvested Shares Weighted-Avg. Grant-date Fair Value | $ 11.86 | $ 9.55 | $ 7.28 | $ 6.46
Unvested Options Granted | 128,124 | 116,080 | 103,780 |
Options Granted Weighted-Avg. Grant-date Fair Value | $ 15.90 | $ 12.43 | $ 8.33 |
Unvested Options Forfeited | (27,782) | (38,720) | (11,395) |
Options Forfeited Weighted-Avg. Grant-date Fair Value | $ 14.75 | $ 8.86 | $ 7.31 |
Vested Options | (100,800) | (104,415) | (98,935) |
Vested Options Weighted-Avg. Grant-date Fair Value | $ 8.53 | $ 6.69 | $ 5.97 |

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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of non-vested options outstanding. + References No definition available. + Details
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