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Note 3 - Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended
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Apr. 03, 2021 | Mar. 28, 2020
Revenue | $ 115,716 | $ 97,316
Percentage of revenue | 100.00% | 100.00%
UNITED STATES |  |
Revenue | $ 9,110 | $ 13,319
Percentage of revenue | 8.00% | 14.00%
Other Americas [Member] |  |
Revenue | $ 6,733 | $ 3,268
Percentage of revenue | 6.00% | 3.00%
Americas [Member] |  |
Revenue | $ 15,843 | $ 16,587
Percentage of revenue | 14.00% | 17.00%
CHINA |  |
Revenue | $ 67,119 | $ 43,499
Percentage of revenue | 58.00% | 45.00%
TAIWAN, PROVINCE OF CHINA |  |
Revenue | $ 2,814 | $ 9,859
Percentage of revenue | 2.00% | 10.00%
JAPAN |  |
Revenue | $ 7,777 | $ 7,999
Percentage of revenue | 7.00% | 8.00%
Other Asia [Member] |  |
Revenue | $ 10,680 | $ 7,336
Percentage of revenue | 9.00% | 8.00%
Asia [Member] |  |
Revenue | $ 88,390 | $ 68,693
Percentage of revenue | 76.00% | 71.00%
Europe [Member] |  |
Revenue | $ 11,483 | $ 12,036
Percentage of revenue | 10.00% | 12.00%
Product [Member] |  |
Revenue | $ 111,592 | $ 93,225
Percentage of revenue | 96.00% | 96.00%
Product [Member] | Sales Channel, Through Intermediary [Member] |  |
Revenue | $ 98,779 | $ 75,455
Percentage of revenue | 85.00% | 78.00%
Product [Member] | Sales Channel, Directly to Consumer [Member] |  |
Revenue | $ 12,813 | $ 17,770
Percentage of revenue | 11.00% | 18.00%
License and Service [Member] |  |
Revenue | $ 4,124 | $ 4,091
Percentage of revenue | 4.00% | 4.00%

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8906-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9031-108599 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9038-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130543-203045 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9054-108599 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130545-203045 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 924 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 11.L) -URI http://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856 + Details
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