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Note 10 - Stock-based Compensation - Summary of Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Outstanding, Numbers of Shares (in shares)	510,361	515,720	437,248
Granted, Numbers of Shares (in shares)	96,330	134,955	184,030
Forfeited, Numbers of Shares (in shares)	(72,166)	(35,015)	(16,334)
Expired, Numbers of Shares (in shares)	(1,024)	(904)
Exercised, Numbers of Shares (in shares)	(75,143)	(104,395)	(89,224)
Outstanding, Numbers of Shares (in shares)	458,358	510,361	515,720	437,248
Exercisable, Numbers of Shares (in shares)					143,836	136,595	157,457
Outstanding, Weighted average exercise price (in dollars per share)	$ 75.78	$ 64.32	$ 55.81
Granted, Weighted average exercise price (in dollars per share)	123.13	102.52	72.89
Forfeited, Weighted average exercise price (in dollars per share)	90.07	87.50	75.16
Expired, Weighted average exercise price (in dollars per share)	82.24	41.51
Exercised, Weighted average exercise price (in dollars per share)	57.99	50.12	38.28
Outstanding, Weighted average exercise price (in dollars per share)	$ 75.78	$ 64.32	$ 55.81	$ 55.81	$ 86.38	$ 75.78	$ 64.32
Exercisable, Weighted average exercise price (in dollars per share)					$ 62.96	$ 50.61	$ 42.49
Outstanding, Weighted average remaining contractual term (Year)	4 years 182 days	5 years	5 years 73 days	4 years 328 days
Granted, Weighted average remaining contractual term (Year)	5 years	5 years 182 days	6 years 255 days
Forfeited, Weighted average remaining contractual term (Year)	4 years 73 days	4 years 182 days	6 years 182 days
Exercisable, Weighted average remaining contractual term (Year)	4 years	3 years 328 days	3 years 219 days
Outstanding, Aggregate intrinsic value				$ 9,445	$ 28,445	$ 23,956	$ 16,561
Outstanding, Aggregate intrinsic value				$ 9,445	28,445	23,956	16,561
Exercisable, Aggregate intrinsic value					$ 12,295	$ 9,847	$ 8,481

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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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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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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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 of the plan that expired.

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