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Note 7 - 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
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Total revenue $ 1,124,492  
Net income $ 57,592 $ 121,943
Basic net income per share (in dollars per share) $ 4.41 $ 8.13
Diluted net income per share (in dollars per share) $ 4.16 $ 7.86
Lew Thompson & Son Trucking, Inc. [Member]    
Total revenue   $ 1,281,504