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, 2017	65,273,896		730,346
Balance at Apr. 30, 2017	$ 652	$ 13,980	$ (764)	$ 9,719	$ 23,587	$ 4,709	$ 28,296
Issuance of stock benefit plan (in shares)	922,958						922,958
Issuance of stock benefit plan	$ 10	251			261		$ 261
Stock repurchase (in shares)			723,191
Stock repurchase			$ (187)		(187)		(187)
BHCMC distribution noncontrolling members						(360)	(360)
Net income				341	341	915	1,256
Issuance of restricted stock to employees
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)
BHCMC distribution noncontrolling members						(720)	(720)
Net income				3,853	3,853	1,797	5,650
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)
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