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, 2018	66,196,854		1,453,537
Balance at Apr. 30, 2018	$ 662	$ 14,231	$ (951)	$ 10,060	$ 24,002	$ 5,264	$ 29,266
Issuance of stock benefit plan (in shares)	2,311,268						2,311,268
Issuance of stock benefit plan	$ 23	561			584		$ 584
Stock repurchase (in shares)			1,273,514
Stock repurchase			$ (436)		(436)		(436)
Restricted stock issued (in shares)	2,500,000
Issuance of restricted stock to employees	$ 25	925			950		950
Deferred compensation, restricted stock		(950)			(950)		(950)
BHCMC distribution noncontrolling members						(720)	(720)
Net Income				3,853	3,853	1,797	5,650
Balance (in shares) at Apr. 30, 2019	71,008,122		2,727,051
Balance at Apr. 30, 2019	$ 710	14,767	$ (1,387)	13,913	28,003	6,341	$ 34,344
Issuance of stock benefit plan (in shares)	1,711,555						1,711,555
Issuance of stock benefit plan	$ 17	659			676		$ 676
Stock repurchase (in shares)			594,364
Stock repurchase			$ (326)		(326)		(326)
Restricted stock issued (in shares)	5,000,000
Issuance of restricted stock to employees	$ 50	1,990			2,040		2,040
Deferred compensation, restricted stock		(1,816)			(1,816)		(1,816)
BHCMC distribution noncontrolling members						(360)	(360)
Net Income				4,234	4,234	(988)	3,246
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