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INCOME TAXES - Reconciliation of taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Apr. 30, 2023
Apr. 30, 2022
INCOME TAXES    
Computed tax provision at statutory rate $ 1,614 $ 4,526
Increase (reduction) in tax resulting from:    
Deferred tax rate changes 105 (453)
Change in valuation allowances (3,297) 183
State income taxes, net of federal income tax effect (2,222) 1,095
Permanent items (13,057)  
Other 2,708 353
Total (benefit) provision for income taxes $ (14,149) $ 5,704