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

12 Months Ended

Mar. 31, 2025

Notes Tables

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

		Year Ended March 31,
		2025				2024				2023
Stock-based compensation expense		$	13,142			$	11,936			$	12,538
Amount of income tax (benefit) recognized in earnings			2,068				2,718				(1,169	)
Stock-based compensation expense, net of tax		$	15,210			$	14,654			$	11,369

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, 2024			76			$	157.83				1.0			$	8,325
Awards granted			117				94.30
Awards forfeited			(11	)			120.39
Awards distributed			(37	)			169.12								3,928
Nonvested as of March 31, 2025			145			$	106.54				1.0			$	17,197
Expected to vest			130			$	107.29				1.1			$	15,466

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, 2024			56			$	240.96				2.6			$	6,142
Awards granted			42				102.57
Awards forfeited			(1	)			112.24
Awards distributed			(12	)			302.06								1,306
Nonvested as of March 31, 2025			85			$	166.31				1.6			$	10,101
Expected to vest			81			$	168.98				1.7			$	9,654

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

		Year Ended March 31,
		2024				2023
Weighted-average value at grant date		$	130.07			$	185.60
Expected life (years)			3.52				3.52
Expected dividend yield			0.07	%			0.07	%
Volatility			37.82	%			37.29	%
Risk-free interest rate			4.16	%			3.55	%

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, 2024			194			$	181.89				3.2			$	26
Awards granted			-				-
Awards forfeited or expired			(17	)			155.06
Awards exercised or distributed			(22	)			123.17								24
Outstanding as of March 31, 2025			155			$	192.92				2.7			$	52
Exercisable awards as of March, 31, 2025			112			$	211.36				2.2			$	18
Exercisable awards and awards expected to vest, March 31, 2025			153			$	193.71				2.7			$	49

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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