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Note 3 - Revenue From Contracts With Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 02, 2021 | Sep. 26, 2020 | Jun. 27, 2020 | Mar. 28, 2020 | Dec. 28, 2019 | Sep. 28, 2019 | Jun. 29, 2019 | Mar. 30, 2019 | Jan. 02, 2021 | Dec. 28, 2019 | Dec. 29, 2018
Revenue | $ 107,173 | $ 103,042 | $ 100,589 | $ 97,316 | $ 100,237 | $ 103,469 | $ 102,296 | $ 98,091 | $ 408,120 | $ 404,093 | $ 398,799
Percentage of revenue |  |  |  |  |  |  |  |  | 100.00% | 100.00% | 100.00%
UNITED STATES |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 43,945 | $ 44,330 | $ 38,585
Percentage of revenue |  |  |  |  |  |  |  |  | 11.00% | 11.00% | 10.00%
Other Americas [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 18,192 | $ 13,606 | $ 16,549
Percentage of revenue |  |  |  |  |  |  |  |  | 4.00% | 3.00% | 4.00%
Americas [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 62,137 | $ 57,936 | $ 55,134
Percentage of revenue |  |  |  |  |  |  |  |  | 15.00% | 14.00% | 14.00%
CHINA |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 213,714 | $ 206,107 | $ 202,983
Percentage of revenue |  |  |  |  |  |  |  |  | 52.00% | 51.00% | 51.00%
TAIWAN, PROVINCE OF CHINA |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 30,972 | $ 19,746 | $ 16,124
Percentage of revenue |  |  |  |  |  |  |  |  | 8.00% | 5.00% | 4.00%
JAPAN |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 25,435 | $ 42,658 | $ 44,033
Percentage of revenue |  |  |  |  |  |  |  |  | 6.00% | 11.00% | 11.00%
Other Asia [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 35,062 | $ 30,254 | $ 34,979
Percentage of revenue |  |  |  |  |  |  |  |  | 9.00% | 7.00% | 9.00%
Asia [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 305,183 | $ 298,765 | $ 298,119
Percentage of revenue |  |  |  |  |  |  |  |  | 75.00% | 74.00% | 75.00%
Europe [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 40,800 | $ 47,392 | $ 45,546
Percentage of revenue |  |  |  |  |  |  |  |  | 10.00% | 12.00% | 11.00%
Product [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 388,502 | $ 382,548 | $ 380,468
Percentage of revenue |  |  |  |  |  |  |  |  | 95.00% | 95.00% | 95.00%
Product [Member] | Sales Channel, Through Intermediary [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 339,100 | $ 331,941 | $ 330,719
Percentage of revenue |  |  |  |  |  |  |  |  | 83.00% | 82.00% | 83.00%
Product [Member] | Sales Channel, Directly to Consumer [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 49,402 | $ 50,607 | $ 49,749
Percentage of revenue |  |  |  |  |  |  |  |  | 12.00% | 13.00% | 12.00%
License and Service [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 19,618 | $ 21,545 | $ 18,331
Percentage of revenue |  |  |  |  |  |  |  |  | 5.00% | 5.00% | 5.00%

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