Condensed Consolidated Statements of Equity (Unaudited) - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Treasury Stock, Common [Member]	Noncontrolling Interest [Member]	Total
Balance (in shares) at Apr. 30, 2023	13,701,468
Balance at Apr. 30, 2023	$ 137	$ 109,929	$ 685,802	$ (297,421)	$ 100	$ 498,547
Issuance of common stock (in shares)	2,921
Issuance of common stock	$ 0	78	0	0	0	78
Stock options exercised (in shares)	6,493
Stock options exercised	$ 0	(455)	0	0	0	(455)
Purchase of treasury shares	0	0	0	(68)	0	(68)
Stock based compensation	0	2,451	0	0	0	2,451
Dividends on subsidiary preferred stock	0	0	(10)	0	0	(10)
Net (loss) income	$ 0	0	4,186	0	0	4,186
Balance (in shares) at Jul. 31, 2023	13,710,882
Balance at Jul. 31, 2023	$ 137	112,003	689,978	(297,489)	100	504,729
Balance (in shares) at Apr. 30, 2024	13,727,013
Balance at Apr. 30, 2024	$ 137	113,930	654,369	(297,786)	100	470,750
Issuance of common stock (in shares)	2,491
Issuance of common stock	$ 0	76	0	0	0	76
Stock options exercised (in shares)	0
Stock options exercised	$ 0	0	0	0	0	0
Purchase of treasury shares	0	0	0	(24)	0	(24)
Stock based compensation	0	1,325	0	0	0	1,325
Dividends on subsidiary preferred stock	0	0	(10)	0	0	(10)
Net (loss) income	$ 0	0	(964)	0	0	(964)
Balance (in shares) at Jul. 31, 2024	13,729,504
Balance at Jul. 31, 2024	$ 137	$ 115,331	$ 653,395	$ (297,810)	$ 100	$ 471,153