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Note 9 - Summary of Unvested Options (Details) - $ / shares | 12 Months Ended
--- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Mar. 31, 2014
Unvested (in shares) | 274,038 | 257,347 | 257,805
Unvested (in dollars per share) | $ 18.42 | $ 11.86 | $ 9.55
Granted (in shares) | 184,030 | 147,720 | 128,124
Options granted (in dollars per share) | $ 18.78 | $ 24.49 | $ 15.90
Options forfeited (in shares) | (16,334) | (26,466) | (27,782)
Options forfeited (in dollars per share) | $ 19.07 | $ 17.29 | $ 14.75
Options vested (in shares) | (83,471) | (104,563) | (100,800)
Options vested (in dollars per share) | $ 14.65 | $ 10.36 | $ 8.53
Unvested (in shares) | 358,263 | 274,038 | 257,347
Unvested (in dollars per share) | $ 19.46 | $ 18.42 | $ 11.86

X
- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- 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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X
- Definition Number of non-vested options outstanding. + References No definition available. + Details
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X
- Definition Number of non-vested options forfeited. + References No definition available. + Details
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- Definition Weighted average grant-date fair value of non-vested options forfeited. + References No definition available. + Details
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- Definition Weighted average grant-date fair value of non-vested options outstanding. + References No definition available. + Details
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- Definition Number of options vested. + References No definition available. + Details
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- Definition Weighted average grant-date fair value of options vested. + References No definition available. + Details
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