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, 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)
Deferred compensation, restricted stock		47			47		47
Net Income (loss)				2,061	2,061	130	2,191
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 (loss)							4,506
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
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)
Deferred compensation, restricted stock		48			48		48
Net Income (loss)				2,230	2,230	85	2,315
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
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
Stock repurchase (in shares)			212,000				212,000	[1]
Stock repurchase			$ (108)		(108)		$ (108)
Deferred compensation, restricted stock		150			150		150
Net Income (loss)				(15)	(15)	(439)	(454)
Balance (in shares) at Jul. 31, 2020	77,719,677		3,533,415
Balance at Jul. 31, 2020	$ 777	15,750	$ (1,821)	18,132	32,838	4,554	37,392
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
Net Income (loss)							48
Balance (in shares) at Oct. 31, 2020	77,719,677		3,686,330
Balance at Oct. 31, 2020	$ 777	15,900	$ (1,898)	18,453	33,232	4,735	37,967
Balance (in shares) at Jul. 31, 2020	77,719,677		3,533,415
Balance at Jul. 31, 2020	$ 777	15,750	$ (1,821)	18,132	32,838	4,554	$ 37,392
Stock repurchase (in shares)			152,915				152,915	[1]
Stock repurchase			$ (77)		(77)		$ (77)
Deferred compensation, restricted stock		150			150		150
Net Income (loss)				321	321	181	502
Balance (in shares) at Oct. 31, 2020	77,719,677		3,686,330
Balance at Oct. 31, 2020	$ 777	$ 15,900	$ (1,898)	$ 18,453	$ 33,232	$ 4,735	$ 37,967

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