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Note F - Debt Facilities - Summary of Debt Facilities (Details) - USD ($)
$ in Thousands
Oct. 31, 2018
Apr. 30, 2018
Debt issuance costs $ (302) $ (435)
Debt facilities 164,789 152,367
Line of Credit [Member]    
Debt facilities, gross 163,857 151,380
Notes Payable [Member]    
Debt facilities, gross 251 305
Capital Lease Obligations [Member]    
Debt facilities, gross $ 983 $ 1,117