INCOME TAXES (Details)	3 Months Ended	9 Months Ended
	Jan. 31, 2020 USD ($)	Jan. 31, 2020 USD ($)
INCOME TAXES
Income tax expense	$ (125,000)	$ 61,000
Effective Income Tax Rate, Percent	22.30%	16.30%
Expected change in the amount of unrecognized tax benefit, accrued interest or penalties within the next twelve months	$ 0	$ 0