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INCOME TAXES: - Reconciliation of taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Apr. 30, 2020
Apr. 30, 2019
INCOME TAXES:    
Computed tax benefit at statutory rate $ (1,603) $ (666)
Increase (reduction) in tax resulting from:    
Deferred tax rate changes 163 (137)
Change in valuation allowances 262 773
State income taxes, net of federal income tax effect (481) (869)
Meals and entertainment   13
Other (64) 178
Total benefit for income taxes $ (1,722) $ (708)