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Note 10 - Commitments and Contingencies (Details Textual) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jan. 31, 2019 | Jan. 31, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Dec. 31, 2019
Purchase Obligation, Due in Next Twelve Months |  |  |  |  |  |  |  | $ 938.0
Loss Contingency, Estimate of Possible Loss |  |  |  |  |  |  |  | $ 2.7
Operating Leases, Future Minimum Payments Due, Total |  |  |  |  |  | $ 117.8 |  |
Operating Leases, Future Minimum Payments Due, Next Twelve Months |  |  |  |  |  | 34.9 |  |
Operating Leases, Future Minimum Payments, Due in Two Years |  |  |  |  |  | 29.9 |  |
Operating Leases, Future Minimum Payments, Due in Three Years |  |  |  |  |  | 20.7 |  |
Operating Leases, Future Minimum Payments, Due in Four Years |  |  |  |  |  | 13.7 |  |
Operating Leases, Future Minimum Payments, Due Thereafter |  |  |  |  |  | 18.6 |  |
Lawsuit for Claims of Unpaid Wages, Failure to Provide Meal and Rest Periods, and Other Items [Member] |  |  |  |  |  |  |  |
Loss Contingency, Damages Sought, Value |  |  |  | $ 15.0 |  |  |  |
Arbitration Case with BNSF [Member] |  |  |  |  |  |  |  |
Loss Contingency, Loss in Period |  |  |  |  |  |  | $ 18.3 |
Arbitration Case with BNSF [Member] | Second Interim Award by Abritrators [Member] |  |  |  |  |  |  |  |
Loss Contingency, Damages Awarded, Value |  | $ 89.4 |  |  |  |  |  |
Arbitration Case with BNSF [Member] | Second Interim Award by Abritrators for 2016 Period at Issue [Member] |  |  |  |  |  |  |  |
Loss Contingency, Damages Awarded, Value |  |  | $ 52.1 |  |  |  |  |
Arbitration Case with BNSF [Member] | Second Interim Award by Abritrators for 2017 [Member] |  |  |  |  |  |  |  |
Loss Contingency, Damages Awarded, Value |  |  | $ 37.3 |  |  |  |  |
Arbitration Case with BNSF [Member] | Interim Award, Contingent Liabilities for Period of May 1, 2016 through December 31, 2017 [Member] |  |  |  |  |  |  |  |
Loss Contingency, Loss in Period |  |  |  |  |  | 89.4 |  |
Arbitration Case with BNSF [Member] | Interim Award, Contingent Liabilities for Period of January 1, 2018 through December 31, 2018 [Member] |  |  |  |  |  |  |  |
Loss Contingency, Loss in Period |  |  |  |  | $ 26.8 | 44.6 |  |
Arbitration Case with BNSF [Member] | Interim Award, Contingent Liabilities for Period of January 1, 2018 through December 31, 2018 [Member] | Legal Fees, Cost and Interest [Member] |  |  |  |  |  |  |  |
Loss Contingency, Loss in Period |  |  |  |  | 17.4 |  |  |
Arbitration Case with BNSF [Member] | Interim Award, Contingent Liabilities for Period of May 1, 2016 through December 31, 2018 [Member] |  |  |  |  |  |  |  |
Loss Contingency, Loss in Period |  |  |  |  |  | $ 134.0 |  |
Arbitration Case with BNSF [Member] | Settled Litigation [Member] |  |  |  |  |  |  |  |
Loss Contingency, Loss in Period |  |  |  |  | $ 44.2 |  |  |
Casualty Claim [Member] | Settled Litigation [Member] | DCS [Member] |  |  |  |  |  |  |  |
Loss Contingency, Loss in Period | $ 20.0 |  |  |  |  |  |  |

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