Consolidated Balance Sheets (Parenthetical) $ in Thousands	12 Months Ended
	Apr. 30, 2024 USD ($) $ / shares shares	Apr. 30, 2023 USD ($) $ / shares shares
Allowance for doubtful accounts receivable | $	$ 143	$ 417
Class A treasury stock shares (in shares)	5,534,953	4,588,632
Class A Common Shares
Common stock, par value (in usd per share) | $ / shares	$ 0.10	$ 0.10
Common stock, shares authorized (in shares)	50,000,000	50,000,000
Common stock, shares issued (in shares)	36,933,495	36,907,242
Common stock, shares outstanding (in shares)	31,398,452	32,318,610
Class B Common Shares
Common stock, par value (in usd per share) | $ / shares	$ 0.10	$ 0.10
Common stock, shares authorized (in shares)	10,000,000	10,000,000
Common stock, shares issued (in shares)	1,821,587	1,821,587
Common stock, shares outstanding (in shares)	1,821,587	1,821,587
Share conversion ratio	1	1