Earnings Per Share (Schedule of Earnings Per Share, Basic and Diluted) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Oct. 31, 2025	Jul. 31, 2025	Oct. 31, 2024	Jul. 31, 2024	Oct. 31, 2025	Oct. 31, 2024
Earnings Per Share [Abstract]
Net income	$ 6,097	$ 14,595	$ 27,686	$ 29,633	$ 20,692	$ 57,319
Denominator for basic net earnings per common share - weighted-average shares	14,566,439		15,327,191		14,538,580	15,438,854
Effect of dilutive securities:
Stock options and restricted stock units	57,000		108,000		63,000	118,000
Diluted (in shares)	14,622,814		15,435,311		14,601,845	15,557,210
Earnings Per Share, Basic [Abstract]
Basic (in usd per share)	$ 0.42		$ 1.81		$ 1.42	$ 3.71
Earnings Per Share, Diluted [Abstract]
Diluted (in usd per share)	$ 0.42		$ 1.79		$ 1.42	$ 3.68
Stock excluded from the calculation of net earnings per share (shares)	0				0