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Note K - Stock-based Compensation Plans (Tables)

12 Months Ended

Apr. 30, 2021

Notes Tables

Stock Option Plan Comparison [Table Text Block]

	Option Plan
Minimum exercise price as a percentage of fair market value at date of grant	100%
Last expiration date for outstanding options	May 1, 2030
Shares available for grant at April 30, 2021	245,000

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

		April 30, 2021				April 30, 2020				April 30, 2019
Expected terms (years)			5.5				5.5				5.5
Risk-free interest rate			0.36%				1.75				2.79%
Volatility			50%				39				36%
Dividend yield			-				-				-

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

		Number				Exercise				Proceeds				Weighted Average
		of				Price				on				Exercise Price per
		Options				per Share				Exercise				Share
										(in thousands)
Outstanding at April 30, 2018			695,500							$	26,683			$	30.50
Granted			145,000			53.30 to54.85					7,915				54.58
Exercised			(275,000	)		18.86 to53.30					(8,511	)			30.95
Outstanding at April 30, 2019			565,500							$	26,087			$	46.13
Granted			225,000			99.05 to109.06					24,287				107.95
Exercised			(121,250	)		22.87 to53.02					(4,517	)			37.25
Cancelled			(1,500	)			$53.02				(80	)			53.02
Outstanding at April 30, 2020			667,750							$	45,777			$	68.55
Granted			30,000				$65.95				30				65.95
Exercised			(131,350	)		24.69 to99.05					(6,730	)			51.24
Outstanding at April 30, 2021			566,400							$	39,077			$	72.43

Schedule of Share-based Compensation, Stock Options, Exercises [Table Text Block]

		Years Ended April 30,
(Dollars in thousands)		2021				2020				2019
Options Exercised			131,350				121,250				275,000
Cash Received from Options Exercised		$	5,120			$	2,928			$	5,663
Intrinsic Value of Options Exercised		$	7,894			$	7,580			$	10,817

Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block]

		Number of Shares				Weighted Average Grant Date Fair Value
Unvested shares at April 30, 2018			179,000			$	45.96
Shares granted			3,000				53.30
Shares vested			-				-
Shares cancelled			(1,500	)			36.38
Unvested shares at April 30, 2019			180,500			$	46.16
Shares granted			12,328				102.03
Shares vested			(7,000	)			52.10
Shares cancelled			(1,000	)			37.07
Unvested shares at April 30, 2020			184,828			$	49.71
Shares granted			7,690				98.43
Shares vested			-				-
Shares cancelled			(500	)			35.00
Unvested shares at April 30, 2021			192,018			$	51.70

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