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Note 17 - Related Parties (Details Textual) - UPRR [Member] - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Dec. 31, 2021
TTX Company [Member] |  |  |  |  |
Accounts Payable, Related Parties, Current | $ 71 |  | $ 71 |  | $ 57
TTX Company [Member] | Car Hire Expenses [Member] |  |  |  |  |
Related Party Transaction, Expenses from Transactions with Related Party | $ 106 | $ 92 | $ 298 | $ 283 |
TTX Company [Member] |  |  |  |  |
Equity Method Investment, Ownership Percentage | 36.79% |  | 36.79% |  |
Equity Method Investments | $ 1,700 |  | $ 1,700 |  | $ 1,600

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