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Note 14 - Income Tax (Details Textual) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability |  | $ 11,678 |
Deferred Tax Assets, Net, Total | $ 6,645 | 29,357 |
Undistributed Earnings of Foreign Subsidiaries | 89,461 | 42,709 |
Unrecognized Tax Benefits, Ending Balance | 1,460 | 1,858 | $ 2,292
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | 1,460 | 1,858 |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense, Total | 6 | 18 |
Recovery of Income Tax Interest and Penalties | 173 | 155 |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total | 190 | 213 |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit | $ 130 |  |
Domestic Tax Authority [Member] | Canada Revenue Agency [Member] | Minimum [Member] |  |  |
Income Tax Return Examination Period | 4 years |  |
Domestic Tax Authority [Member] | Canada Revenue Agency [Member] | Maximum [Member] |  |  |
Income Tax Return Examination Period | 7 years |  |
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] | Minimum [Member] |  |  |
Income Tax Return Examination Period | 3 years |  |
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] | Maximum [Member] |  |  |
Income Tax Return Examination Period | 5 years |  |
Foreign Tax Authority [Member] | Other Foreign Tax Authorities [Member] |  |  |
Income Tax Return Examination Period | 4 years |  |
UNITED STATES |  |  |
Undistributed Earnings of Foreign Subsidiaries | $ 0 | $ 0 |

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