Condensed Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($) $ in Thousands		Total	Class A Common Shares	Class B Common Shares	Common Stock Class A Common Shares	Common Stock Class B Common Shares	Additional paid-in capital	Retained deficit	Treasury stock
Beginning balance (in shares) at Apr. 30, 2023					36,907,242	1,821,587
Beginning balance at Apr. 30, 2023		$ 137,557			$ 3,691	$ 182	$ 182,722	$ (23,479)	$ (25,559)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock for equity incentive awards (in shares)					22,253
Issuance of common stock for equity incentive awards		246			$ 2		244
Stock-based compensation		3,134					3,134
Purchases of common stock		(4,814)							(4,814)
Net earnings		5,111						5,111
Dividends declared	[1]	(7,515)						(7,515)
Ending balance (in shares) at Oct. 31, 2023					36,929,495	1,821,587
Ending balance at Oct. 31, 2023		133,719			$ 3,693	$ 182	186,100	(25,883)	(30,373)
Beginning balance (in shares) at Jul. 31, 2023					36,929,495	1,821,587
Beginning balance at Jul. 31, 2023		138,348			$ 3,693	$ 182	184,520	(24,488)	(25,559)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation		1,580					1,580
Purchases of common stock		(4,814)							(4,814)
Net earnings		2,363						2,363
Dividends declared	[1]	(3,758)						(3,758)
Ending balance (in shares) at Oct. 31, 2023					36,929,495	1,821,587
Ending balance at Oct. 31, 2023		133,719			$ 3,693	$ 182	186,100	(25,883)	(30,373)
Beginning balance (in shares) at Apr. 30, 2024			36,933,495	1,821,587	36,933,495	1,821,587
Beginning balance at Apr. 30, 2024		130,481			$ 3,693	$ 182	189,330	(26,930)	(35,794)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock for equity incentive awards (in shares)					95,613
Issuance of common stock for equity incentive awards		0			$ 10		(10)
Conversion of B Shares to Common Stock (in shares)					2,185,904	(1,821,587)
Conversion of B shares to common stock		0			$ 219	$ (182)	(37)
Stock-based compensation	[1]	3,196					3,196
Net earnings		3,791						3,791
Dividends declared	[1]	(7,373)						(7,373)
Ending balance (in shares) at Oct. 31, 2024			39,215,012	0	39,215,012	0
Ending balance at Oct. 31, 2024		130,095			$ 3,922	$ 0	192,479	(30,512)	(35,794)
Beginning balance (in shares) at Jul. 31, 2024					37,008,055	1,821,587
Beginning balance at Jul. 31, 2024		130,454			$ 3,701	$ 182	190,908	(28,543)	(35,794)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock for equity incentive awards (in shares)					21,053
Issuance of common stock for equity incentive awards		0			$ 2		(2)
Conversion of B Shares to Common Stock (in shares)					2,185,904	(1,821,587)
Conversion of B shares to common stock		0			$ 219	$ (182)	(37)
Stock-based compensation	[1]	1,610					1,610
Net earnings		1,738						1,738
Dividends declared	[1]	(3,707)						(3,707)
Ending balance (in shares) at Oct. 31, 2024			39,215,012	0	39,215,012	0
Ending balance at Oct. 31, 2024		$ 130,095			$ 3,922	$ 0	$ 192,479	$ (30,512)	$ (35,794)

[1] Amounts adjusted for rounding