Significant Accounting Policies (Policies)	3 Months Ended
Mar. 28, 2020
Accounting Policies [Abstract]
Basis of Accounting, Policy [Policy Text Block]	Basis of Presentation and Use of Estimates The accompanying Consolidated Financial Statements are unaudited and have been prepared in accordance with U.S. Generally Accepted Accounting Principles ("U.S. GAAP") and pursuant to the rules and regulations of the SEC. In our opinion, they include all adjustments, consisting only of normal recurring adjustments, necessary for the fair presentation of results for the interim periods. Certain information and footnote disclosures normally included in financial statements prepared in accordance with U.S. GAAP have been condensed or omitted as permitted by the SEC's rules and regulations for interim reporting. These Consolidated Financial Statements should be read in conjunction with our audited financial statements and notes thereto included in our Annual Report on Form 10-K for the year ended December 28, 2019 ("2019 10-K"). The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and judgments affecting the amounts reported in our consolidated condensed financial statements and the accompanying notes. The actual results that we experience may differ materially from our estimates. We describe our accounting methods and practices in more detail in our 2019 10-K. There have been no changes to the significant accounting policies, procedures, or general information described in our 2019 10-K that have had a material impact on our consolidated financial statements and related notes.
Fiscal Period, Policy [Policy Text Block]	Fiscal Reporting Periods We report based on a 52 or 53-week fiscal year ending on the Saturday closest to December 31. Our fiscal 2020 will be a 53-week year and will end on January 2, 2021, and our fiscal 2019 was a 52-week year that ended December 28, 2019. Our first quarter of fiscal 2020 and first quarter of fiscal 2019 ended on March 28, 2020 and March 30, 2019, respectively. All references to quarterly financial results are references to the results for the relevant 13-week fiscal period.
Concentration Risk, Credit Risk, Policy [Policy Text Block]	Concentrations of Risk Distributors have historically accounted for a significant portion of our total revenue. Revenue attributable to distributors as a percentage of total revenue was 78% and 79% for the first quarter of fiscal 2020 and 2019, respectively. In the periods covered by this report, no end customer accounted for more than 10% of total revenue. Distributors also account for a substantial portion of our net accounts receivable. Our two largest distributors accounted for 38% and 36% of net accounts receivable at March 28, 2020 and 40% and 38% of net accounts receivable at December 28, 2019. No other distributor or end customer accounted for more than 10% of net accounts receivable at these dates.
New Accounting Pronouncements, Policy [Policy Text Block]	Recently Issued Accounting Standards In December 2019, the FASB issued ASU 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes, which adds new guidance for accounting for tax law changes, year-to-date losses in interim periods, and determining how to apply the income tax guidance to franchise taxes that are partially based on income, as well as other changes to simplify accounting for income taxes. The ASU is effective for calendar year-end public business entities on January 1, 2021. Entities may early adopt the ASU in any interim period for which financial statements have not yet been issued (or made available for issuance). We are currently assessing the impact of ASU 2019-12 on our consolidated financial statements and related disclosures.

Significant Accounting Policies (Policies)

3 Months Ended

Mar. 28, 2020

Basis of Accounting, Policy [Policy Text Block]

Basis of Presentation and Use of Estimates

The accompanying Consolidated Financial Statements are unaudited and have been prepared in accordance with U.S. Generally Accepted Accounting Principles ("U.S. GAAP") and pursuant to the rules and regulations of the SEC. In our opinion, they include all adjustments, consisting only of normal recurring adjustments, necessary for the fair presentation of results for the interim periods. Certain information and footnote disclosures normally included in financial statements prepared in accordance with U.S. GAAP have been condensed or omitted as permitted by the SEC's rules and regulations for interim reporting. These Consolidated Financial Statements should be read in conjunction with our audited financial statements and notes thereto included in our Annual Report on Form 10-K for the year ended December 28, 2019 ("2019 10-K").

The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and judgments affecting the amounts reported in our consolidated condensed financial statements and the accompanying notes. The actual results that we experience may differ materially from our estimates.

We describe our accounting methods and practices in more detail in our 2019 10-K. There have been no changes to the significant accounting policies, procedures, or general information described in our 2019 10-K that have had a material impact on our consolidated financial statements and related notes.

Fiscal Period, Policy [Policy Text Block]

Fiscal Reporting Periods

We report based on a 52 or 53-week fiscal year ending on the Saturday closest to December 31. Our fiscal 2020 will be a 53-week year and will end on January 2, 2021, and our fiscal 2019 was a 52-week year that ended December 28, 2019. Our first quarter of fiscal 2020 and first quarter of fiscal 2019 ended on March 28, 2020 and March 30, 2019, respectively. All references to quarterly financial results are references to the results for the relevant 13-week fiscal period.

Concentration Risk, Credit Risk, Policy [Policy Text Block]

Concentrations of Risk

Distributors have historically accounted for a significant portion of our total revenue. Revenue attributable to distributors as a percentage of total revenue was 78% and 79% for the first quarter of fiscal 2020 and 2019, respectively. In the periods covered by this report, no end customer accounted for more than 10% of total revenue.

Distributors also account for a substantial portion of our net accounts receivable. Our two largest distributors accounted for 38% and 36% of net accounts receivable at March 28, 2020 and 40% and 38% of net accounts receivable at December 28, 2019. No other distributor or end customer accounted for more than 10% of net accounts receivable at these dates.

New Accounting Pronouncements, Policy [Policy Text Block]

Recently Issued Accounting Standards

In December 2019, the FASB issued ASU 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes, which adds new guidance for accounting for tax law changes, year-to-date losses in interim periods, and determining how to apply the income tax guidance to franchise taxes that are partially based on income, as well as other changes to simplify accounting for income taxes. The ASU is effective for calendar year-end public business entities on January 1, 2021. Entities may early adopt the ASU in any interim period for which financial statements have not yet been issued (or made available for issuance). We are currently assessing the impact of ASU 2019-12 on our consolidated financial statements and related disclosures.