INCOME TAXES: (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2020	Apr. 30, 2019
Current:
Federal	$ (36)	$ (414)
State and local	112	5
Total Current	76	(409)
Deferred:
Federal	(1,597)	(193)
State and local	(201)	(106)
Deferred Income Tax Expense (Benefit), Total	(1,798)	(299)
Total benefit for income taxes	$ (1,722)	$ (708)