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Note 10 - Stock-based Compensation - Summary of Unvested Options (Details) - $ / shares	12 Months Ended
	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

X

- Definition

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

+ References

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+ Details

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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=96867065&loc=d3e5070-113901

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- Definition

Number of non-vested options outstanding.

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- Definition

Number of non-vested options forfeited.

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- Definition

Weighted average grant-date fair value of non-vested options forfeited.

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Weighted average grant-date fair value of non-vested options outstanding.

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- Definition

Weighted average grant-date fair value of options vested.

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