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Note 1 - Basis of Presentation and Significant Accounting Policies (Details Textual) $ in Thousands | 12 Months Ended
--- | ---
Jan. 02, 2021 | Dec. 28, 2019 USD ($) | Dec. 29, 2018 USD ($)
Goodwill, Impairment Loss |  | $ 0 | $ 0
Share-based Compensation Arrangement By Share-based Payment Award, Award Vesting Rights, Number Of Consecutive Trailing Periods | 2 |  |
Number of Operating Segments | 1 |  |
Performance Shares [Member] | TSR Relative To PHLX Semiconductor Sector Index, 25th Percentile [Member] | Executive Officer [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage, Based on Market Conditions | 0.00% |  |
Performance Shares [Member] | TSR Relative To PHLX Semiconductor Sector Index, 75th Percentile [Member] | Executive Officer [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage, Based on Market Conditions | 100.00% |  |
Minimum [Member] | Performance Shares [Member] | TSR Relative To PHLX Semiconductor Sector Index, 25th Percentile [Member] | Executive Officer [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage, Based on Market Conditions | 0.00% |  |
Minimum [Member] | Performance Shares [Member] | TSR Relative To PHLX Semiconductor Sector Index, 75th Percentile [Member] | Executive Officer [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage, Based on Market Conditions | 200.00% |  |
Maximum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period (Year) | 3 years |  |
Maximum [Member] | Performance Shares [Member] | TSR Relative To PHLX Semiconductor Sector Index, 75th Percentile [Member] | Executive Officer [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage, Based on Market Conditions | 250.00% |  |
Production Equipment and Software [Member] | Minimum [Member] |  |  |
Property, Plant and Equipment, Useful Life (Year) | 3 years |  |
Production Equipment and Software [Member] | Maximum [Member] |  |  |
Property, Plant and Equipment, Useful Life (Year) | 5 years |  |
Tools, Dies and Molds [Member] | Minimum [Member] |  |  |
Property, Plant and Equipment, Useful Life (Year) | 1 year |  |
Tools, Dies and Molds [Member] | Maximum [Member] |  |  |
Property, Plant and Equipment, Useful Life (Year) | 3 years |  |
Accounts Receivable [Member] | Weikeng Group [Member] | Customer Concentration Risk [Member] |  |  |
Concentration Risk, Percentage | 47.00% | 38.00% |
Accounts Receivable [Member] | Arrow Electronics Inc [Member] | Customer Concentration Risk [Member] |  |  |
Concentration Risk, Percentage | 45.00% | 40.00% |

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