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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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Mar. 28, 2020 | Mar. 30, 2019
Revenue | $ 97,316 | $ 98,091
Percentage of revenue | 100.00% | 100.00%
UNITED STATES |  |
Revenue | $ 13,319 | $ 12,895
Percentage of revenue | 14.00% | 13.00%
Other Americas [Member] |  |
Revenue | $ 3,268 | $ 3,975
Percentage of revenue | 3.00% | 4.00%
Americas [Member] |  |
Revenue | $ 16,587 | $ 16,870
Percentage of revenue | 17.00% | 17.00%
CHINA |  |
Revenue | $ 43,499 | $ 48,305
Percentage of revenue | 45.00% | 49.00%
TAIWAN, PROVINCE OF CHINA |  |
Revenue | $ 9,859 | $ 2,678
Percentage of revenue | 10.00% | 3.00%
JAPAN |  |
Revenue | $ 7,999 | $ 11,857
Percentage of revenue | 8.00% | 12.00%
Other Asia [Member] |  |
Revenue | $ 7,336 | $ 6,171
Percentage of revenue | 8.00% | 7.00%
Asia [Member] |  |
Revenue | $ 68,693 | $ 69,011
Percentage of revenue | 71.00% | 71.00%
Europe [Member] |  |
Revenue | $ 12,036 | $ 12,210
Percentage of revenue | 12.00% | 12.00%
Product [Member] |  |
Revenue | $ 93,225 | $ 91,612
Percentage of revenue | 96.00% | 93.00%
Product [Member] | Sales Channel, Through Intermediary [Member] |  |
Revenue | $ 75,455 | $ 77,472
Percentage of revenue | 78.00% | 79.00%
Product [Member] | Sales Channel, Directly to Consumer [Member] |  |
Revenue | $ 17,770 | $ 14,140
Percentage of revenue | 18.00% | 14.00%
License and Service [Member] |  |
Revenue | $ 4,091 | $ 6,479
Percentage of revenue | 4.00% | 7.00%

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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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