EARNINGS PER SHARE (Details) - USD ($)	3 Months Ended		6 Months Ended
	Oct. 31, 2015	Oct. 31, 2014	Oct. 31, 2015	Oct. 31, 2014
EARNINGS PER SHARE
Net earnings	$ 234,000	$ 79,000	$ 295,000	$ (36,000)
Amounts allocated to participating securities (nonvested restricted shares)	(14,000)	(5,000)	(18,000)
Net income (loss) attributable to common shareholders	$ 220,000	$ 74,000	$ 277,000	$ (36,000)
Basic weighted average common shares	5,265,750	5,265,750	5,265,750	5,265,750
Basic earnings per share	$ 0.04	$ 0.01	$ 0.05	$ (0.01)