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Note M - Leases - Lease Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Lease revenue $ 2,168 $ 2,251 $ 4,315 $ 4,618
Trucks under Operating Lease [Member]        
Lease revenue 2,069 2,152 4,118 4,291
Dock Space under Operating Lease [Member]        
Lease revenue $ 99 $ 99 $ 197 $ 327