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

12 Months Ended

Mar. 31, 2021

Notes Tables

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

		Year Ended March 31,
		2021				2020				2019
Stock-based compensation expense		$	9,268			$	5,525			$	4,212
Amount of income tax (benefit) recognized in earnings			(1,816	)			(1,576	)			(2,370	)
Stock-based compensation expense, net of tax		$	7,452			$	3,949			$	1,842

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

		2021				2020				2019
Risk-free interest rate			0.27	%			1.80	%			2.63	%
Expected life (years)			3.86				4.33				5.00
Expected dividend yield			0.10	%			0.13	%			0.45	%
Volatility			38.83	%			36.52	%			35.96	%
Weighted-average Black-Scholes fair value per share at date of grant		$	67.66			$	66.02			$	54.02

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 at March 31, 2020			286			$	107.72				3.1				33,927
Awards granted			36				226.72
Awards forfeited or expired			(13	)			115.23
Awards exercised or distributed			(56	)			84.40
Outstanding as of March 31, 2021			253			$	129.55				2.7			$	28,856
Exercisable as of March 31, 2021			121			$	102.31				2.0			$	17,155
Vested and expected to vest, March 31, 2021			246			$	132.59				2.7			$	28,847

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, 2020			28			$	180.15				1.7			$	6,258
Awards granted			22				231.61
Awards forfeited or expired			(3	)			204.30
Awards distributed			(10	)			189.01
Nonvested as of March 31, 2021			37			$	206.56				1.1			$	8,948

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, 2020 at target			22			$	204.68				1.6			$	4,903
Awards forfeited or expired at target			(2	)			228.27
Nonvested as of March 31, 2021 at target			20			$	207.88				0.8			$	4,884
Expected to vest			34			$	195.78				0.6				8,359

X

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