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Note 17 - Segment Information - Segment Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Freight revenue $ 1,103,573 $ 1,216,858 $ 1,046,003
Operating income 58,823 120,682 67,162
Operating Segments [Member]      
Freight revenue 1,103,573 1,216,858 1,046,003
Operating income 58,823 120,682 67,162
Depreciation and amortization 69,943 57,512 53,881
Intersegment Eliminations [Member]      
Freight revenue 10,859 5,505 7,429
Consolidation, Eliminations [Member]      
Freight revenue (10,859) (5,505) (7,429)
Highway Services [Member] | Operating Segments [Member]      
Freight revenue 423,820 452,713 337,063
Operating income 28,861 60,552 33,064
Depreciation and amortization 35,451 30,101 25,364
Highway Services [Member] | Intersegment Eliminations [Member]      
Freight revenue 10,859 5,505 7,429
Dedicated [Member]      
Freight revenue 320,287 362,997 324,541
Dedicated [Member] | Operating Segments [Member]      
Freight revenue 320,287 362,997 324,541
Operating income 17,712 21,087 (1,357)
Depreciation and amortization 32,163 25,449 25,960
Dedicated [Member] | Intersegment Eliminations [Member]      
Freight revenue 0 0 0
Managed Freight [Member]      
Freight revenue 258,903 320,985 321,236
Managed Freight [Member] | Operating Segments [Member]      
Freight revenue 258,903 320,985 321,236
Operating income 9,388 36,858 32,461
Depreciation and amortization 562 247 595
Managed Freight [Member] | Intersegment Eliminations [Member]      
Freight revenue 0 0 0
Factoring [Member] | Operating Segments [Member]      
Freight revenue 100,563 80,163 63,163
Operating income 2,862 2,185 2,994
Depreciation and amortization 1,767 1,715 1,962
Factoring [Member] | Intersegment Eliminations [Member]      
Freight revenue $ 0 $ 0 $ 0