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Note 5 - Stock-Based Compensation (Details) - Summary of Unvested Options - 3 months ended Jun. 30, 2015 - $ / shares	Total
Summary of Unvested Options [Abstract]
Unvested Shares	360,414
Weighted Average Grant Date Fair Value	$ 19.22
Stock options granted	167,270
Stock options granted	$ 18.40
Stock options forfeited	(4,691)
Stock options forfeited	$ 19.15
Stock options vested	(76,203)
Stock options vested	$ 14.55

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Gross number of share options (or share units) granted during the period.

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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

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