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Note 8 - Stock Transactions and Stock-based Compensation (Tables)

12 Months Ended

Mar. 31, 2019

Notes Tables

Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]

		Year Ended March 31,
		2019				2018				2017
Stock-based compensation expense (A)		$	4,212			$	1,672			$	1,411
Amount of income tax (benefit) expense recognized in earnings			(2,370	)			(1,194	)			(1,737	)
Stock-based compensation expense (benefit), net of tax		$	1,842			$	478			$	(326	)

Share-based Payment Arrangement, Option, Activity [Table Text Block]

		Shares Subject to Options				Weighted Average Exercise Price Per Share				Weighted- Average Remaining Contractual Life (Years)				Aggregate Intrinsic Value
Outstanding, April 1, 2018			458			$	86.38				4.5			$	28,445
Awards granted			26				144.96
Awards forfeited or expired			(38	)			99.00
Awards exercised			(92	)			67.84
Outstanding, March 31, 2019			354				94.04				3.8				48,301
Exercisable, March 31, 2019			121				78.30				3.5				18,374
Vested and expected to vest, March 31, 2019			331				93.29				3.8				45,463

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

		2019				2018				2017
Risk-free interest rate			2.63	%			1.88	%			1.56	%
Expected life (years)			5.00				5.52				5.47
Expected dividend yield			0.45	%			0.54	%			0.64	%
Volatility			35.96	%			32.92	%			32.34	%
Weighted-average Black-Scholes fair value per share at date of grant		$	54.02			$	39.06			$	31.27

Share-based Payment Arrangement, Activity [Table Text Block]

		Number of Shares				Weighted- Average Grant Date Fair Value per Share				Weighted- Average Remaining Contractual Life (Years)				Aggregate Intrinsic Value
Outstanding at March 31, 2018			8			$	126.03				4.5				982
Awards granted			29				171.13
Awards forfeited or expired			(3	)			168.24
Awards vested			(3	)			149.44
Outstanding as of March 31, 2019			31			$	162.23				2.1				7,155

X

- Definition

Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement.

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