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Note M - Leases - Lease Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Lease revenue $ 2,327 $ 2,208 $ 6,945 $ 5,950
Trucks under Operating Lease [Member]        
Lease revenue 2,228 2,039 6,519 5,444
Dock Space under Operating Lease [Member]        
Lease revenue $ 99 $ 169 $ 426 $ 506