Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]	Parent [Member]	Noncontrolling Interest [Member]	Total
Balance (in shares) at Apr. 30, 2020	77,719,677		3,321,415
Balance at Apr. 30, 2020	$ 777	$ 15,600	$ (1,713)	$ 18,147	$ 32,811	$ 4,993	$ 37,804
Issuance of stock benefit plan (in shares)	1,400,705		0				1,400,705
Issuance of stock benefit plan	$ 14	707	$ 0	0	721	0	$ 721
Stock repurchase (in shares)	0		382,218
Stock repurchase	$ 0	0	$ (196)	0	(196)	0	(196)
Deferred compensation, restricted stock	(1)	593	0	0	592	0	592
Net Income	$ 0	0	$ 0	1,433	1,433	1,025	2,458
Balance (in shares) at Apr. 30, 2021	79,070,382		3,703,633
Balance at Apr. 30, 2021	$ 790	16,900	$ (1,909)	19,580	35,361	6,018	$ 41,379
Issuance of stock benefit plan (in shares)	1,328,190		0				1,328,190
Issuance of stock benefit plan	$ 13	794	$ 0	0	807	0	$ 807
Stock repurchase (in shares)	0		186,793
Stock repurchase	$ 0	0	$ (168)	0	(168)	0	(168)
Deferred compensation, restricted stock	0	585	0	0	585	0	585
Net Income	0	0	0	10,368	10,368	1,872	12,240
Purchase of non-controlling interest in BHCMC, LLC	$ 0	(6,119)	$ 0	0	(6,119)	(7,890)	(14,009)
Deferred compensation, restricted stock (in shares)	(50,000)		0
Balance (in shares) at Apr. 30, 2022	80,348,572		3,890,426
Balance at Apr. 30, 2022	$ 803	$ 12,160	$ (2,077)	$ 29,948	$ 40,834	$ 0	$ 40,834