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Note 10 - Acquisitions (Details Textual) - USD ($)
$ in Millions
Feb. 28, 2022
Jun. 30, 2022
Dec. 31, 2021
Goodwill, Ending Balance   $ 111.7 $ 100.5
Zenith Freight Lines, LLC [Member]      
Business Combination, Consideration Transferred, Total $ 86.9    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles 42.7    
Goodwill, Ending Balance 11.2    
Zenith Freight Lines, LLC [Member] | General and Administrative Expense [Member]      
Business Combination, Acquisition Related Costs $ 0.9