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Note 10 - Stock-based Compensation - Summary of Unvested Options (Details) - $ / shares | 12 Months Ended
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Mar. 31, 2017 | Mar. 31, 2016 | Mar. 31, 2015
Unvested, Shares (in shares) | 358,263 | 274,038 | 257,347
Unvested, Weighted-average grant-date fair value (in dollars per share) | $ 19.46 | $ 18.42 | $ 11.86
Granted, Numbers of Shares (in shares) | 134,955 | 184,030 | 147,720
Options granted, Weighted-average grant-date fair value (in dollars per share) | $ 31.27 | $ 18.78 | $ 24.49
Options forfeited, Shares (in shares) | (35,015) | (16,334) | (26,466)
Options forfeited, Weighted-average grant-date fair value (in dollars per share) | $ 22.64 | $ 19.07 | $ 17.29
Options vested, Shares (in shares) | (84,437) | (83,471) | (104,563)
Options vested, Weighted-average grant-date fair value (in dollars per share) | $ 16.96 | $ 14.65 | $ 10.36
Unvested, Shares (in shares) | 373,766 | 358,263 | 274,038
Unvested, Weighted-average grant-date fair value (in dollars per share) | $ 22.49 | $ 19.46 | $ 18.42

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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=96867065&loc=d3e5070-113901 + Details
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- Definition Number of non-vested options outstanding. + References No definition available. + Details
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