INCOME TAXES: (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2017	Apr. 30, 2016
Current:
Federal	$ 347	$ (35)
State and local	26	126
Current Income Tax Expense (Benefit)	373	91
Deferred:
Federal	(32)	(5,074)
State and local	656	(228)
Deferred Income Tax Expense (Benefit)	624	(5,302)
Total provision (benefit) for income taxes	$ 997	$ (5,211)