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Note 15 - Income Taxes (Details Textual) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 26, 2020 | Sep. 28, 2019 | Sep. 26, 2020 | Sep. 28, 2019
Income Tax Expense (Benefit), Total | $ (167) | $ 70 | $ (2,815) | $ 255
Effective Income Tax Rate Reconciliation, Percent, Total |  |  | 28.20% | 25.90%
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] |  |  |  |
Effective Income Tax Rate Reconciliation, Percent, Total |  |  | 27.00% | 28.30%
Foreign Tax Authority [Member] | Canada Revenue Agency [Member] |  |  |  |
Effective Income Tax Rate Reconciliation, Percent, Total |  |  | 26.70% | 26.50%
Foreign Tax Authority [Member] | Ministry of Finance, Republic of Serbia [Member] |  |  |  |
Effective Income Tax Rate Reconciliation, Percent, Total |  |  | 15.10% | 15.00%

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