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Note 3 - Income Taxes (Details Textual) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2017 | Mar. 31, 2018 | Dec. 31, 2017
Deferred Tax Liabilities, Net, Total |  | $ 116.2 |
Deferred Tax Assets, Valuation Allowance, Total |  | 80.4 | $ 78.7
Internal Revenue Service (IRS) [Member] | Domestic Tax Authority [Member] |  |  |
Deferred Tax Liabilities, Net, Total |  | 0.3 |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | $ (15.0) |  |
Canada Revenue Agency [Member] | Foreign Tax Authority [Member] |  |  |
Deferred Tax Liabilities, Net, Total |  | 116.9 |
Mexican Tax Authority [Member] | Foreign Tax Authority [Member] |  |  |
Deferred Tax Assets, Net, Total |  | $ 1.0 |

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