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Note 9 - Acquisitions (Details Textual) - BNSF Logistics, Llc [Member]
$ in Millions
9 Months Ended
Sep. 30, 2023
USD ($)
Business Combination, Consideration Transferred $ 85.0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles 41.9
Goodwill $ 12.4