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Note 11 - Stock Transactions and Stock-based Compensation (Tables)

12 Months Ended

Mar. 31, 2020

Notes Tables

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

		Year Ended March 31,
		2020				2019				2018
Stock-based compensation expense (A)		$	5,525			$	4,212			$	1,672
Amount of income tax (benefit) recognized in earnings			(1,576	)			(2,370	)			(1,194	)
Stock-based compensation expense, net of tax		$	3,949			$	1,842			$	478

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

		2020				2019				2018
Risk-free interest rate			1.80	%			2.63	%			1.88	%
Expected life (years)			4.33				5.00				5.52
Expected dividend yield			0.13	%			0.45	%			0.54	%
Volatility			36.52	%			35.96	%			32.92	%
Weighted-average Black-Scholes fair value per share at date of grant		$	66.02			$	54.02			$	39.06

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

		Stock Options
		Shares Subject to Options				Weighted- Average Exercise Price per Share				Weighted-Average Remaining Contractual Life (Years)				Aggregate Intrinsic Value
Outstanding at March 31, 2019			354			$	94.04				3.8				48,301
Awards granted			29				206.35
Awards forfeited or expired			(36	)			100.18
Awards exercised or distributed			(61	)			79.81
Outstanding as of March 31, 2020			286			$	107.72				3.1			$	33,927
Exercisable as of March 31, 2020			121			$	88.77				2.7			$	16,583
Vested and expected to vest, March 31, 2020			278			$	107.32				3.1			$	33,031

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

		Time-Based Restricted Stock Units
		Number of Shares				Weighted- Average Grant Date Fair Value per Share				Weighted- average Remaining Contractual Life (Years)				Aggregate Intrinsic Value
Nonvested at March 31, 2019			21			$	146.92				2.1			$	4,773
Awards granted			16				213.31
Awards forfeited or expired			(3	)			161.58
Awards distributed			(6	)			160.87
Nonvested as of March 31, 2020			28			$	180.15				1.7			$	6,258

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

		Performance-Based Restricted Stock Units
		Number of Shares				Weighted- Average Grant Date Fair Value per Share				Weighted- average Remaining Contractual Life (Years)				Aggregate Intrinsic Value
Nonvested at March 31, 2019			10			$	192.99				2.2			$	2,382
Awards granted			13				215.47
Awards forfeited or expired			(1	)			217.00
Awards distributed			--				-
Nonvested as of March 31, 2020			22			$	204.68				1.6			$	4,903

X

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