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Note 1 - Summary of Significant Accounting Policies - Revenue by Operating Segment (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Total revenues $ 1,131,476 $ 1,103,573 $ 1,216,858
Highway Services [Member]      
Total revenues   423,820 452,713
Highway Services [Member] | Expedited [Member]      
Total revenues 416,461 423,820 452,713
Dedicated [Member]      
Total revenues 364,414 320,287 362,997
Managed Freight [Member]      
Total revenues 248,939 258,903 320,985
Managed Freight [Member] | Warehouse [Member]      
Total revenues $ 101,662 $ 100,563 $ 80,163