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INCOME TAXES: (Details 3) - USD ($)
$ in Thousands
12 Months Ended
Apr. 30, 2017
Apr. 30, 2016
Gross unrecognized tax benefits at beginning of year $ 58 $ 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 0
Gross unrecognized tax benefits at end of year $ 58 $ 58