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Note 5 - Stock-Based Compensation (Details) - Summary of Option Activity - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
	Jun. 30, 2015	Mar. 31, 2015
Summary of Option Activity [Abstract]
Number of Shares	564,793	437,248
Weighted Average Exercise Price	$ 61.39	$ 55.81
SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	5 years 255 days	4 years 328 days
Aggregate Intrinsice Value	$ 15,639	$ 9,445
Exercisable at June 30, 2015	204,379
Exercisable at June 30, 2015	$ 41.32
Exercisable at June 30, 2015	3 years 328 days
Exercisable at June 30, 2015	$ 9,740
Stock options granted	167,270
Stock options granted	$ 70.78
Stock options granted	7 years 219 days
Stock options forfeited	(4,691)
Stock options forfeited	$ 71.71
Stock options forfeited	6 years 292 days
Stock options exercised	(35,034)
Stock options exercised	$ 35.21

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.

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Weighted average remaining contractual term for forfeited portions of options outstanding 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 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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-Name Accounting Standards Codification



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-SubTopic 10



-Section 50



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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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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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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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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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