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Note M - Leases - Lease Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Lease revenue $ 2,371 $ 1,897 $ 4,857 $ 3,704
Trucks under Operating Lease [Member]        
Lease revenue 2,332 1,858 4,780 3,627
Dock Space under Operating Lease [Member]        
Lease revenue $ 39 $ 39 $ 77 $ 77