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Note 12 - Acquisition of Lew Thompson & Son Trucking, Inc - Pro Forma Consolidated Results of Operations (Details) - Lew Thompson & Son Trucking, Inc. [Member] - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Total revenue $ 279,421      
Net income $ 12,976 $ 26,430 $ 31,659 $ 50,500
Basic net income per share (in dollars per share) $ 1.00 $ 1.70 $ 2.41 $ 3.14
Diluted net income per share (in dollars per share) $ 0.96 $ 1.68 $ 2.30 $ 3.09
Lew Thompson & Son Trucking, Inc. [Member]        
Total revenue   $ 333,441 $ 562,485 $ 641,090