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Note 9 - Acquisitions (Details Textual) - BNSF Logistics, Llc [Member] - USD ($)
$ in Millions
Sep. 30, 2023
Sep. 30, 2024
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