EARNINGS PER SHARE (Details) - USD ($)	3 Months Ended
	Jul. 31, 2020	Jul. 31, 2019
EARNINGS PER SHARE
Net income	$ 730,000	$ 444,000
Amounts allocated to participating securities (nonvested restricted shares)	(89,000)	(54,000)
Net income attributable to common shareholders	$ 641,000	$ 390,000
Basic weighted average common shares	5,265,750	5,265,750
Earnings per share attributable to common shareholders:
Basic earnings per share	$ 0.12	$ 0.07