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Note 7 - Stockholders' Equity (Tables)

6 Months Ended

Sep. 30, 2021

Notes Tables

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

		Three Months Ended September 30,								Six Months Ended September 30,
		2022				2021				2021				2020
Stock-based compensation expense		$	2,039			$	2,008			$	4,236			$	3,276
Amount of income tax (benefit) recognized in earnings			(719	)			(522	)			(3,504	)			(1,447	)
Stock-based compensation expense, net of tax		$	1,320			$	1,486			$	732			$	1,829

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				268.85
Awards forfeited or expired			(3	)			173.29
Awards exercised			(37	)			94.49
Outstanding as of September 30, 2021			250			$	154.16				2.9			$	37,092

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

		Time-Based Restricted Stock Units								Performance-Based Restricted Stock Units
		Number of Shares				Weighted- Average Grant Date Fair Value per Share				Number of Shares				Weighted- Average Grant Date Fair Value per Share
Outstanding as of March 31, 2021(1)			37			$	206.56				20			$	207.88
Awards granted			29				267.09				-				-
Performance adjustment(2)			-				-				16				190.07
Awards forfeited			(1	)			210.22				-				-
Awards distributed			(19	)			208.13				(28	)			197.81
Outstanding as of September 30, 2021(1)			46			$	244.45				8			$	202.00

X

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