EARNINGS PER SHARE (Details) - USD ($)	3 Months Ended		6 Months Ended
	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2019	Oct. 31, 2018
EARNINGS PER SHARE
Net income (loss)	$ 306,000	$ 32,000	$ 750,000	$ (11,000)
Amounts allocated to participating securities (nonvested restricted shares)	(37,000)	(2,000)	(91,000)
Net income (loss) attributable to common shareholders	$ 269,000	$ 30,000	$ 659,000	$ (11,000)
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	$ 0.05	$ 0.01	$ 0.13	$ 0.00