Note 9 - Stock Based Compensation (Details) - Summary of Stock Option Activity - Employee Stock Option [Member] - $ / shares	3 Months Ended
Jun. 30, 2015	Mar. 31, 2015
Note 9 - Stock Based Compensation (Details) - Summary of Stock Option Activity [Line Items]
Outstanding	1,807,521	2,070,672
Outstanding	$ 12.72	$ 12.08
Exercisable at June 30, 2015	735,646
Exercisable at June 30, 2015	$ 9.43
Granted	23,818	29,500
Granted	$ 41.11	$ 23.45
Exercised	(62,625)	(212,276)
Exercised	$ 5.68	$ 7.25
Forfeited or expired		(80,375)
Forfeited or expired		$ 14.48
Outstanding	1,768,714	1,807,521
Outstanding	$ 13.35	$ 12.72

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(iii)

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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Weighted average price of options that were either forfeited or expired.

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

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Number of share options (or share units) exercised during the current period.

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