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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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Namespace Prefix:	us-gaap_
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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Period Type:	duration

X

- Definition

Number of non-vested options outstanding.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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X

- Definition

Number of non-vested options forfeited.

+ References

No definition available.

+ Details

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Period Type:	duration

X

- Definition

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

+ References

No definition available.

+ Details

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X

- Definition

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

+ References

No definition available.

+ Details

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X

- Definition

Number of options vested.

+ References

No definition available.

+ Details

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X

- Definition

Weighted average grant-date fair value of options vested.

+ References

No definition available.

+ Details

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