EARNINGS PER SHARE (Details) - USD ($)	3 Months Ended		9 Months Ended
	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2017	Jan. 31, 2016
EARNINGS PER SHARE
Net earnings (loss)	$ (191,000)	$ 101,000	$ (176,000)	$ 396,000
Amounts allocated to participating securities (nonvested restricted shares)		(6,000)		(25,000)
Net income attributable to common shareholders	$ (191,000)	$ 95,000	$ (176,000)	$ 371,000
Basic weighted average common shares	4,915,750	5,265,750	5,077,171	5,265,750
Earnings per share attributable to common shareholders:
Basic earnings (loss) per share	$ (0.04)	$ 0.02	$ (0.03)	$ 0.07