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Intangible Assets (Tables) | 9 Months Ended
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Sep. 29, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Finite-Lived Intangible Assets [Table Text Block] | Intangible assets, net consisted of the following (in thousands):
|  | September 29, 2017 |  | December 30, 2016 |
|  | Gross |  |  |  |  |  | Gross |  |  |  |  |
|  | Carrying |  | Accumulated |  |  |  | Carrying |  | Accumulated |  |  |
|  | Amount |  | Amortization |  | Net |  | Amount |  | Amortization |  | Net |
Long-lived intangible assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Patents and licenses |  | $ | 9,245 |  | $ | (8,965) |  | $ | 280 |  | $ | 9,224 |  | $ | (8,930) |  | $ | 294 |
Customer relationships |  |  | 1,393 |  |  | (1,359) |  |  | 34 |  |  | 1,343 |  |  | (1,209) |  |  | 134 |
Developed technology |  |  | 886 |  |  | (874) |  |  | 12 |  |  | 854 |  |  | (809) |  |  | 45 |
Total |  | $ | 11,524 |  | $ | (11,198) |  | $ | 326 |  | $ | 11,421 |  | $ | (10,948) |  | $ | 473 |

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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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