EARNINGS PER SHARE (Details) - USD ($)	3 Months Ended		9 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2020	Jan. 31, 2019
EARNINGS PER SHARE
Net income (loss)	$ (436,000)	$ (406,000)	$ 314,000	$ (417,000)
Amounts allocated to participating securities (nonvested restricted shares)			(38,000)
Net income (loss) attributable to common shareholders	$ (436,000)	$ (406,000)	$ 276,000	$ (417,000)
Basic weighted average common shares	5,265,750	5,265,750	5,265,750	5,265,750
Earnings (loss) per share attributable to common shareholders:
Basic earnings (loss) per share	$ (0.08)	$ (0.08)	$ 0.05	$ (0.08)