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Note M - Leases - Lease Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Lease revenue $ 1,739 $ 2,461
Trucks under Operating Lease [Member]    
Lease revenue 1,570 2,394
Dock Space under Operating Lease [Member]    
Lease revenue $ 169 $ 67