EARNINGS PER SHARE (Details) - USD ($)	3 Months Ended		6 Months Ended
	Oct. 31, 2016	Oct. 31, 2015	Oct. 31, 2016	Oct. 31, 2015
EARNINGS PER SHARE
Net earnings (loss)	$ (110,000)	$ 234,000	$ 15,000	$ 295,000
Amounts allocated to participating securities (nonvested restricted shares)		(14,000)	(1,000)	(18,000)
Net income attributable to common shareholders	$ (110,000)	$ 220,000	$ 14,000	$ 277,000
Basic weighted average common shares	5,065,861	5,265,750	4,982,367	5,265,750
Earnings per share attributable to common shareholders:
Basic earnings per share	$ (0.02)	$ 0.04	$ 0.00	$ 0.05