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Note 8 - Stockholders' Equity (Tables)

6 Months Ended

Sep. 30, 2020

Notes Tables

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

		Three Months Ended September 30,								Six Months Ended September 30,
		2020				2019				2020				2019
Stock-based compensation expense		$	2,008			$	1,182			$	3,276			$	2,050
Amount of income tax (benefit) recognized in earnings			(522	)			(368	)			(1,447	)			(908	)
Stock-based compensation expense, net of tax		$	1,486			$	814			$	1,829			$	1,142

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

		Stock Options
		Shares Subject to Options				Weighted- Average Exercise Price per Share
Outstanding at March 31, 2020			286			$	107.72
Awards granted			36				226.72
Awards forfeited or expired			(10	)			112.27
Awards exercised			(36	)			83.69
Outstanding as of September 30, 2020			276			$	126.30

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
Nonvested at March 31, 2020			28			$	180.15				22			$	204.68
Awards granted			19				225.32				-				-
Awards forfeited or expired			(3	)			205.10				(1	)			199.50
Awards distributed			(5	)			177.17				-				-
Nonvested as of September 30, 2020			39			$	201.49				21			$	204.80

X

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