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Note F - Debt Facilities - Summary of Debt Facilities (Details) - USD ($)
Jan. 31, 2021
Apr. 30, 2020
Finance lease $ 81,000 $ 445,000
Debt issuance costs (803,000) (787,000)
Debt facilities 210,478,000 215,568,000
Line of Credit [Member]    
Debt facilities, gross 211,200,000 215,831,000
Notes Payable [Member]    
Debt facilities, gross $ 0 $ 79,000