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Note 16 - Income Tax (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Tax Credit Carryforward Duration Limit (Year) | 20 years |
Undistributed Earnings of Foreign Subsidiaries | $ 628,142 | $ 528,519
Unrecognized Tax Benefits, Ending Balance | 148 | 148
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | 148 | 148
Tax Adjustments, Settlements, and Unusual Provisions | 0 | 0
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total | $ 38 | $ 38
Minimum [Member] | Foreign Tax Authority [Member] | Canada Revenue Agency [Member] |  |
Income Tax Return Examination Period (Year) | 3 years |
Minimum [Member] | Foreign Tax Authority [Member] | Internal Revenue Service (IRS) [Member] |  |
Income Tax Return Examination Period (Year) | 3 years |
Maximum [Member] | Foreign Tax Authority [Member] | Canada Revenue Agency [Member] |  |
Income Tax Return Examination Period (Year) | 4 years |
Maximum [Member] | Foreign Tax Authority [Member] | Internal Revenue Service (IRS) [Member] |  |
Income Tax Return Examination Period (Year) | 5 years |
Canada and United States [Member] | Minimum [Member] |  |
Tax Credit Carryforward Duration Limit (Year) | 6 years |
Canada and United States [Member] | Maximum [Member] |  |
Tax Credit Carryforward Duration Limit (Year) | 20 years |

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