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

12 Months Ended

Mar. 31, 2023

Notes Tables

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

		Year Ended March 31,
		2023				2022				2021
Stock-based compensation expense		$	12,538			$	11,391			$	9,268
Amount of income tax (benefit) recognized in earnings			(1,169	)			(4,055	)			(1,816	)
Stock-based compensation expense, net of tax		$	11,369			$	7,336			$	7,452

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

		2023				2022				2021
Risk-free interest rate			3.55	%			0.46	%			0.27	%
Expected life (years)			3.52				3.52				3.86
Expected dividend yield			0.07	%			0.06	%			0.10	%
Volatility			37.29	%			38.82	%			38.83	%
Weighted-average Black-Scholes fair value per share at date of grant		$	58.94			$	76.02			$	67.66

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, 2022			202			$	167.14				2.9			$	18,261
Awards granted			43				185.60
Awards forfeited or expired			(9	)			218.13
Awards exercised or distributed			(73	)			97.34
Outstanding as of March 31, 2023			163			$	200.62				3.3			$	1,643
Exercisable as of March, 31, 2023			83			$	193.05				2.3			$	1,405
Exercisable and expected to vest, March 31, 2023			160			$	200.62				3.2			$	1,641

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, 2022			51			$	252.86				1.0			$	13,019
Awards granted			43				187.21
Awards forfeited or expired			(10	)			229.52
Awards distributed			(27	)			250.85
Nonvested as of March 31, 2023			57			$	209.27				1.0			$	9,993
Expected to vest			53			$	209.43				1.8			$	9,254

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, 2022 at target			55			$	288.45				4.3			$	14,093
Awards granted			19				182.14
Performance adjustment			(20	)
Awards distributed			(10	)			202.00
Nonvested as of March 31, 2023 at target			44			$	286.02				3.5			$	7,958
Expected to vest			42			$	287.48				3.4				7,306

X

- Definition

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