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Income taxes (Narrative) (Details) - USD ($) $ in Thousands | Dec. 28, 2019 | Dec. 29, 2018 | Dec. 30, 2017
--- | --- | --- | ---
Income Tax Disclosure [Line Items] |  |  |
Deferred tax assets, valuation allowance | $ 6,219 | $ 5,445 | $ 9,162
U.S. [Member] | Scientific research investment tax credits [Member] | Federal [Member] |  |  |
Income Tax Disclosure [Line Items] |  |  |
Tax credit carryforward, amount | 600 | 1,100 |
U.S. [Member] | Research and development tax credits [Member] | State [Member] |  |  |
Income Tax Disclosure [Line Items] |  |  |
Tax credit carryforward, amount | 900 | 900 |
U.S. [Member] | Capital loss carryforward [Member] | Federal [Member] |  |  |
Income Tax Disclosure [Line Items] |  |  |
Operating loss carryforwards | 78,000 | 72,000 |
U.S. [Member] | Capital loss carryforward [Member] | State [Member] |  |  |
Income Tax Disclosure [Line Items] |  |  |
Operating loss carryforwards | 14,400 | 15,100 |
Canada [Member] | Capital loss carryforward [Member] |  |  |
Income Tax Disclosure [Line Items] |  |  |
Operating loss carryforwards | $ 28,900 | $ 29,700 |

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