Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - 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
Stock repurchase (in shares)				25,277				25,277	[1]
Stock repurchase				$ (6)		(6)		$ (6)
Net Income					509	509	413	922
Balance (in shares) at Jul. 31, 2018		66,196,854		1,478,814
Balance at Jul. 31, 2018		$ 662	14,231	$ (957)	10,569	24,505	5,677	30,182
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
Net Income								5,038
Balance (in shares) at Jan. 31, 2019		66,196,854		2,146,346
Balance at Jan. 31, 2019		$ 662	14,231	$ (1,165)	13,630	27,358	6,011	33,369
Balance (in shares) at Jul. 31, 2018		66,196,854		1,478,814
Balance at Jul. 31, 2018		$ 662	14,231	$ (957)	10,569	24,505	5,677	$ 30,182
Stock repurchase (in shares)				480,805				480,805	[1]
Stock repurchase				$ (144)		(144)		$ (144)
Net Income					1,721	1,721	735	2,456
BHCMC distribution noncontrolling interest							(360)	(360)
Balance (in shares) at Oct. 31, 2018		66,196,854		1,959,619
Balance at Oct. 31, 2018		$ 662	14,231	$ (1,101)	12,290	26,082	6,052	$ 32,134
Stock repurchase (in shares)				186,727				186,727	[1]
Stock repurchase				$ (64)		(64)		$ (64)
Net Income					1,340	1,340	319	1,659
BHCMC distribution noncontrolling interest							(360)	(360)
Balance (in shares) at Jan. 31, 2019		66,196,854		2,146,346
Balance at Jan. 31, 2019		$ 662	14,231	$ (1,165)	13,630	27,358	6,011	$ 33,369
Stock repurchase (in shares)	[1]							580,705
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
Stock repurchase (in shares)				120,821				120,821	[1]
Stock repurchase				$ (43)		(43)		$ (43)
Net Income					2,061	2,061	130	2,191
Deferred compensation, restricted stock			47			47		47
Balance (in shares) at Jul. 31, 2019		71,008,122		2,847,872
Balance at Jul. 31, 2019		$ 710	14,814	$ (1,430)	15,974	30,068	6,471	36,539
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
Net Income								5,863
Balance (in shares) at Jan. 31, 2020		71,008,122		3,321,390
Balance at Jan. 31, 2020		$ 710	14,909	$ (1,713)	19,539	33,445	6,218	39,663
Balance (in shares) at Jul. 31, 2019		71,008,122		2,847,872
Balance at Jul. 31, 2019		$ 710	14,814	$ (1,430)	15,974	30,068	6,471	$ 36,539
Stock repurchase (in shares)				206,050				206,050	[1]
Stock repurchase				$ (95)		(95)		$ (95)
Net Income					2,230	2,230	85	2,315
Deferred compensation, restricted stock			48			48		48
Balance (in shares) at Oct. 31, 2019		71,008,122		3,053,922
Balance at Oct. 31, 2019		$ 710	14,862	$ (1,525)	18,204	32,251	6,556	$ 38,807
Stock repurchase (in shares)				267,468				267,468	[1]
Stock repurchase				$ (188)		(188)		$ (188)
Net Income					1,335	1,335	22	1,357
BHCMC distribution noncontrolling interest							(360)	(360)
Deferred compensation, restricted stock			47			47		47
Balance (in shares) at Jan. 31, 2020		71,008,122		3,321,390
Balance at Jan. 31, 2020		$ 710	$ 14,909	$ (1,713)	$ 19,539	$ 33,445	$ 6,218	$ 39,663

[1] These shares of common stock purchased were purchased through a private transaction.