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Note F - Debt Facilities - Summary of Debt Facilities (Details) - USD ($)
$ in Thousands
Jul. 31, 2018
Apr. 30, 2018
Debt issuance costs $ (366) $ (435)
Debt facilities 155,135 152,367
Line of Credit [Member]    
Debt facilities, gross 154,173 151,380
Notes Payable [Member]    
Debt facilities, gross 278 305
Capital Lease Obligations [Member]    
Debt facilities, gross $ 1,050 $ 1,117