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Note 11 - Acquisitions (Details Textual) - USD ($)
$ in Millions
Sep. 30, 2023
Sep. 30, 2022
Sep. 14, 2022
Feb. 28, 2022
BNSF Logistics, Llc [Member]        
Business Combination, Consideration Transferred $ 85.0      
Payments to Acquire Businesses, Gross 81.2      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles 38.5      
Goodwill $ 13.6      
Alterri Distribution Center, LLC [Member]        
Business Combination, Consideration Transferred   $ 31.1 $ 31.0  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles     0.9  
Goodwill     $ 8.8  
Zenith Freight Lines, LLC [Member]        
Payments to Acquire Businesses, Gross       $ 87.1
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles       42.7
Goodwill       11.1
Business Combination, Purchase Price       $ 86.9