Earnings Per Share (Schedule of Earnings Per Share, Basic and Diluted) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Jul. 31, 2025	Jul. 31, 2024
Earnings Per Share [Abstract]
Net income	$ 14,595	$ 29,633
Denominator for basic net earnings per common share - weighted-average shares	14,510,721	15,550,517
Effect of dilutive securities:
Stock options and restricted stock units	59,000	123,000
Diluted (in shares)	14,569,734	15,673,570
Earnings Per Share, Basic [Abstract]
Basic (in usd per share)	$ 1.01	$ 1.91
Earnings Per Share, Diluted [Abstract]
Diluted (in usd per share)	$ 1.00	$ 1.89
Stock excluded from the calculation of net earnings per share (shares)	0