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, 2016	64,066,873		600,000
Balance at Apr. 30, 2016	$ 640	$ 13,716	$ (732)	$ 8,185	$ 21,809	$ 4,289	$ 26,098
Issuance of stock benefit plan (in shares)	1,087,264						1,087,264
Issuance of stock benefit plan	$ 11	240			251		$ 251
Stock issued as director fees (in shares)	119,759
Stock issued as director fees	$ 1	24			25		25
Stock repurchase (in shares)			130,346
Stock repurchase			$ (32)		(32)		(32)
BHCMC distribution noncontrolling members						(360)	(360)
Net income				1,534	1,534	780	2,314
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
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