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Note 5 - Stock-Based Compensation (Details) - Summary of Unvested Options (USD $)	6 Months Ended
	Sep. 30, 2014	Mar. 31, 2013
Summary of Unvested Options [Abstract]
Unvested Options	280,818	257,347
Unvested Shares Weighted-Avg. Grant-date Fair Value	$ 18.32	$ 11.86
Stock options granted	145,400
Stock options granted	$ 24.23
Stock options forfeited	(25,916)
Stock options forfeited	$ 17.15
Stock options vested	(96,013)
Stock options vested	$ 10.04

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

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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

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Number of non-vested options outstanding.

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Number of non-vested options forfeited.

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

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