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Note M - Leases - Lease Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Lease revenue $ 2,283 $ 1,975 $ 7,140 $ 5,679
Trucks under Operating Lease [Member]        
Lease revenue 2,244 1,936 7,024 5,563
Dock Space under Operating Lease [Member]        
Lease revenue $ 39 $ 39 $ 116 $ 116