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Income taxes (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 30, 2017 | Dec. 31, 2016 | Jan. 02, 2016
Tax Credit Carryforward, Expiration Date | Jan. 01, 2029 |  |
Valuation Allowance, Amount | $ 9,162 | $ 9,090 | $ 9,347
Internal Revenue Service (IRS) [Member] |  |  |
Open Tax Year | 2009 |  |
US | State and Local Jurisdiction [Member] |  |  |
Operating Loss Carryforwards | $ 62,600 | 64,200 |
Research Tax Credit Carryforward [Member] | US |  |  |
Tax Credit Carryforward, Amount | 400 | 400 |
Research Tax Credit Carryforward [Member] | US State [Member] |  |  |
Tax Credit Carryforward, Amount | 900 | 800 |
Capital Loss Carryforward [Member] | US |  |  |
Operating Loss Carryforwards | 46,000 | 51,300 |
Capital Loss Carryforward [Member] | CA |  |  |
Operating Loss Carryforwards | $ 27,700 | $ 29,700 |

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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319 + Details
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