EARNINGS PER SHARE (Details) - USD ($)	3 Months Ended		6 Months Ended
	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2017	Oct. 31, 2016
EARNINGS PER SHARE
Net earnings (loss)	$ (171,000)	$ (110,000)	$ (364,000)	$ 15,000
Amounts allocated to participating securities (nonvested restricted shares)				(1,000)
Net income attributable to common shareholders	$ (171,000)	$ (110,000)	$ (364,000)	$ 14,000
Basic weighted average common shares	5,265,750	5,065,861	5,265,750	4,982,367
Earnings per share attributable to common shareholders:
Basic earnings (loss) per share	$ (0.03)	$ (0.02)	$ (0.07)	$ 0.00