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INCOME TAXES: - Gross amount of unrecognized tax benefits (Details) - USD ($)
$ in Thousands
12 Months Ended
Apr. 30, 2020
Apr. 30, 2019
Apr. 30, 2018
INCOME TAXES:      
Gross unrecognized tax benefits at beginning of year $ 0 $ 0 $ 58
Gross increases:      
Additions based on tax positions related to current year 0 0  
Additions based on tax positions of prior years 0 0  
Gross decreases:      
Reductions based on tax positions of prior years 0 0  
Reductions based on the lapse of the applicable statute of limitations 0 (58)  
Gross unrecognized tax benefits at end of year $ 0 $ 0 $ 58