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Note 3 - Income Taxes (Details Textual) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2017 | Sep. 30, 2017 | Dec. 31, 2016
Deferred Tax Liabilities, Net |  | $ 78.0 |
Deferred Tax Assets, Valuation Allowance |  | 72.0 | $ 100.0
Internal Revenue Service (IRS) [Member] | Domestic Tax Authority [Member] |  |  |
Deferred Tax Assets, Net |  | 44.7 |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | $ (15.0) |  |
Canada Revenue Agency [Member] | Foreign Tax Authority [Member] |  |  |
Deferred Tax Liabilities, Net |  | $ 122.7 |

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