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Note F - Debt Facilities - Summary of Debt Facilities (Details) - USD ($)
$ in Thousands
Apr. 30, 2019
Apr. 30, 2018
Debt issuance costs $ (555) $ (435)
Debt facilities 152,918 152,367
Line of Credit [Member]    
Debt facilities, gross 152,440 151,380
Notes Payable [Member]    
Debt facilities, gross 194 305
Capital Lease Obligations [Member]    
Debt facilities, gross $ 839 $ 1,117