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Note F - Debt Facilities - Summary of Debt Facilities (Details) - USD ($)
Oct. 31, 2020
Apr. 30, 2020
Finance lease $ 202,000 $ 445,000
Debt issuance costs (670,000) (787,000)
Debt facilities 213,523,000 215,568,000
Line of Credit [Member]    
Debt facilities, gross 213,971,000 215,831,000
Notes Payable [Member]    
Debt facilities, gross $ 20,000 $ 79,000