EARNINGS PER SHARE (Details) - USD ($)	3 Months Ended		9 Months Ended
	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2018	Jan. 31, 2017
EARNINGS PER SHARE
Net earnings (loss)	$ (307,000)	$ (191,000)	$ (671,000)	$ (176,000)
Net earnings (loss) attributable to common shareholders	$ (307,000)	$ (191,000)	$ (671,000)	$ (176,000)
Basic weighted average common shares	5,265,750	4,915,750	5,265,750	5,077,171
Earnings per share attributable to common shareholders:
Basic earnings (loss) per share	$ (0.06)	$ (0.04)	$ (0.13)	$ (0.03)