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Note 15 - Income Taxes (Details Textual) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 29, 2019 | Mar. 30, 2019 | Jun. 30, 2018 | Jun. 29, 2019 | Jun. 30, 2018
Income Tax Expense (Benefit), Total | $ 459 |  | $ 121 | $ 185 | $ 483
Effective Income Tax Rate Reconciliation, Tax Settlement, Domestic, Amount |  | $ 600 |  |  |
Effective Income Tax Rate Reconciliation, Percent, Total |  |  |  | 27.10% | 25.20%
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] |  |  |  |  |
Effective Income Tax Rate Reconciliation, Percent, Total |  |  |  | 28.60% | 28.30%
Foreign Tax Authority [Member] | Canada Revenue Agency [Member] |  |  |  |  |
Effective Income Tax Rate Reconciliation, Percent, Total |  |  |  | 26.50% | 26.50%
Foreign Tax Authority [Member] | Ministry of Finance, Republic of Serbia [Member] |  |  |  |  |
Effective Income Tax Rate Reconciliation, Percent, Total |  |  |  | 15.00% | 17.30%

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