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Note 12 - Information Concerning Product Lines, Geographic Information and Revenue Concentration (Details Textual) - USD ($) | 3 Months Ended | 9 Months Ended
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Sep. 27, 2020 | Sep. 27, 2020 | Sep. 29, 2019 | Sep. 27, 2020 | Sep. 29, 2019
Revenue from Contract with Customer, Excluding Assessed Tax, Total | [1] |  | $ 1,780,000 | $ 2,158,000 | $ 6,134,000 | $ 7,439,000
JAPAN |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax, Total |  | $ 271,000 |  | $ 510,000 | $ 1,400,000 | $ 1,300,000
JAPAN | Revenue Benchmark [Member] | Geographic Concentration Risk [Member] |  |  |  |  |  |
Concentration Risk, Percentage |  | 15.00% |  | 24.00% | 23.00% | 17.00%
UNITED STATES |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax, Total |  | $ 1,100,000 |  | $ 1,400,000 | $ 3,300,000 | $ 3,600,000
UNITED STATES | Revenue Benchmark [Member] | Geographic Concentration Risk [Member] |  |  |  |  |  |
Concentration Risk, Percentage |  | 61.00% |  | 67.00% | 54.00% | 49.00%
Non-US [Member] | Assets, Total [Member] | Geographic Concentration Risk [Member] |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  |  | 6.00% |
[1] | For all periods presented: New products include all products manufactured on 180 nanometer or smaller semiconductor processes, eFPGA IP license, Quick AI and SensiML AI software as a service ("SaaS") revenues. Mature products include all products produced on semiconductor processes larger than 180 nanometer.

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