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Note 9 - Stock-based Compensation (Details) - Summary of Unvested Options (USD $)	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Summary of Unvested Options [Abstract]
Unvested Options	257,347	257,805	284,875	291,425
Unvested Shares Weighted-Avg. Grant-date Fair Value	$ 11.86	$ 9.55	$ 7.28	$ 6.46
Unvested Options Granted	128,124	116,080	103,780
Options Granted Weighted-Avg. Grant-date Fair Value	$ 15.90	$ 12.43	$ 8.33
Unvested Options Forfeited	(27,782)	(38,720)	(11,395)
Options Forfeited Weighted-Avg. Grant-date Fair Value	$ 14.75	$ 8.86	$ 7.31
Vested Options	(100,800)	(104,415)	(98,935)
Vested Options Weighted-Avg. Grant-date Fair Value	$ 8.53	$ 6.69	$ 5.97

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

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