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Geographic and Product Data (Tables) | 6 Months Ended
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Jul. 01, 2016
Segment Reporting [Abstract] |
Revenue from External Customers by Geographic Areas [Table Text Block] | The composition of the Company’s net sales to unaffiliated customers is set forth below (in thousands):
|  | Three Months Ended |  | Six Months Ended |
|  | July 1, |  | July 3, |  | July 1, |  | July 3, |
|  | 2016 |  | 2015 |  | 2016 |  | 2015 |
Japan |  | $ | 3,989 |  | $ | 3,980 |  | $ | 8,229 |  | $ | 8,267 |
China |  |  | 4,417 |  |  | 3,327 |  |  | 7,495 |  |  | 5,698 |
United States |  |  | 2,420 |  |  | 2,723 |  |  | 4,936 |  |  | 5,589 |
Korea |  |  | 1,665 |  |  | 1,269 |  |  | 3,687 |  |  | 3,612 |
Spain |  |  | 1,528 |  |  | 1,486 |  |  | 2,980 |  |  | 2,964 |
France |  |  | 1,103 |  |  | 888 |  |  | 2,230 |  |  | 2,039 |
Germany |  |  | 1,153 |  |  | 694 |  |  | 2,120 |  |  | 1,190 |
Other |  |  | 4,699 |  |  | 4,290 |  |  | 8,566 |  |  | 8,155 |
Total |  | $ | 20,974 |  | $ | 18,657 |  | $ | 40,243 |  | $ | 37,514 |
Revenue from External Customers by Products and Services [Table Text Block] | The composition of the Company’s net sales by product line is as follows (in thousands):
|  | Three Months Ended |  | Six Months Ended |
|  | July 1, |  | July 3, |  | July 1, |  | July 3, |
|  | 2016 |  | 2015 |  | 2016 |  | 2015 |
ICLs |  | $ | 15,408 |  | $ | 12,236 |  | $ | 28,588 |  | $ | 24,490 |
IOLs |  |  | 5,068 |  |  | 5,204 |  |  | 10,134 |  |  | 10,562 |
Core products |  |  | 20,476 |  |  | 17,440 |  |  | 38,722 |  |  | 35,052 |
Other surgical products |  |  | 498 |  |  | 1,217 |  |  | 1,521 |  |  | 2,462 |
Total |  | $ | 20,974 |  | $ | 18,657 |  | $ | 40,243 |  | $ | 37,514 |

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- Definition Tabular disclosure of revenue from external customers by geographic areas attributed to the entity's country of domicile and to foreign countries from which the entity derives revenue. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph a -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e9038-108599 + Details
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- Definition Tabular disclosure of entity-wide revenues from external customers for each product or service or each group of similar products or services if the information is not provided as part of the reportable operating segment information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e9031-108599 + Details
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