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Note F - Debt Facilities - Summary of Debt Facilities (Details) - USD ($)
$ in Thousands
Jan. 31, 2020
Apr. 30, 2019
Debt issuance costs $ (823) $ (555)
Debt facilities 184,300 152,918
Line of Credit [Member]    
Debt facilities, gross 184,464 152,440
Notes Payable [Member]    
Debt facilities, gross 109 194
Capital Lease Obligations [Member]    
Debt facilities, gross $ 550 $ 839