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Note M - Leases - Lease Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Lease revenue $ 2,051 $ 2,327 $ 6,366 $ 6,945
Trucks under Operating Lease [Member]        
Lease revenue 1,952 2,228 6,070 6,519
Dock Space under Operating Lease [Member]        
Lease revenue $ 99 $ 99 $ 296 $ 426