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Note 5 - Stock-Based Compensation (Details) - Summary of Option Activity (USD $) In Thousands, except Share data, unless otherwise specified	6 Months Ended	12 Months Ended
	Sep. 30, 2014	Mar. 31, 2014
Summary of Option Activity [Abstract]
Outstanding Number of Shares	481,458	398,172
Outstanding Weighted-Avg. Exercise Price	$ 53.23	$ 38.75
Outstanding Weighted-Avg. Remaining Contractual Term	5 years	4 years 146 days
Outstanding Aggregate Intrinsic Value	$ 6,595	$ 20,505
Exercisable at September 30, 2014	200,640
Exercisable at September 30, 2014	$ 31.41
Exercisable at September 30, 2014	3 years 109 days
Exercisable at September 30, 2014	$ 5,291
Stock options granted	145,400
Stock options granted	$ 89.11
Stock options granted	7 years 6 months
Stock options forfeited	(25,916)
Stock options forfeited	$ 64.09
Stock options exercised	(36,198)
Stock options exercised	$ 29.25

X

- Definition

Weighted average remaining contractual term for option awards granted during the reporting period, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

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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.

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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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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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.

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

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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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 price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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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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