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INCOME TAXES - Reconciliation of taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Apr. 30, 2022
Apr. 30, 2021
INCOME TAXES    
Computed tax provision at statutory rate $ 4,526 $ 2,108
Increase (reduction) in tax resulting from:    
Deferred tax rate changes (453) 139
Change in valuation allowances 183 (304)
State income taxes, net of federal income tax effect 1,095 366
Permanent items 0 (63)
Other 353 397
Total provision (benefit) for income taxes $ 5,704 $ 2,643