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, 2015	62,860,098		600,000
Balance at Apr. 30, 2015	$ 628	$ 13,487	$ (732)	$ 8,161	$ 21,544	$ 3,858	$ 25,402
Issuance of stock benefit plan (in shares)	1,206,775						1,206,775
Issuance of stock benefit plan	$ 12	229			241		$ 241
BHCMC distribution noncontrolling members						(360)	(360)
Net income				24	24	791	815
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