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Note M - Leases - Lease Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Lease revenue $ 2,251 $ 2,004 $ 4,618 $ 3,742
Trucks under Operating Lease [Member]        
Lease revenue 2,152 1,835 4,291 3,405
Dock Space under Operating Lease [Member]        
Lease revenue $ 99 $ 169 $ 327 $ 337