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Note 9 - Stock Transactions and Stock-based Compensation (Tables)

12 Months Ended

Mar. 31, 2022

Notes Tables

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

		Year Ended March 31,
		2022				2021				2020
Stock-based compensation expense		$	11,391			$	9,268			$	5,525
Amount of income tax (benefit) recognized in earnings			(4,055	)			(1,816	)			(1,576	)
Stock-based compensation expense, net of tax		$	7,336			$	7,452			$	3,949

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

		2022				2021				2020
Risk-free interest rate			0.46	%			0.27	%			1.80	%
Expected life (years)			3.52				3.86				4.33
Expected dividend yield			0.06	%			0.10	%			0.13	%
Volatility			38.82	%			38.83	%			36.52	%
Weighted-average Black-Scholes fair value per share at date of grant		$	76.02			$	67.66			$	66.02

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 as of March 31, 2021			253			$	129.55				2.7			$	28,856
Awards granted			37				268.81
Awards forfeited or expired			(4	)			191.52
Awards exercised or distributed			(84	)			96.68
Outstanding as of March 31, 2022			202			$	167.14				2.9			$	18,261
Exercisable as of March, 31, 2022			100			$	128.32				1.9			$	12,636
Exercisable and expected to vest, March 31, 2022			199			$	174.79				3.0			$	18,357

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, 2021			37			$	206.56				1.1			$	8,948
Awards granted			37				274.55
Awards forfeited or expired			(3	)			250.09
Awards distributed			(20	)			208.52
Nonvested as of March 31, 2022			51			$	252.86				1.0			$	13,019

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, 2021 at target			20			$	207.88				0.8			$	4,884
Awards granted			48				302.15
Performance adjustment			16
Awards distributed			(29	)			197.81
Nonvested as of March 31, 2022 at target			55			$	288.45				4.3			$	14,093
Expected to vest			53			$	283.88				2.8				13,531

X

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