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Note 9 - Income Taxes (Details Textual) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2018 | Dec. 30, 2017 | Jul. 01, 2017 | Jun. 30, 2018 | Jul. 01, 2017 | Dec. 29, 2018 | Dec. 30, 2017 | Dec. 31, 2017
Effective Income Tax Rate Reconciliation, Percent, Total | 19.10% |  | 15.20% | 19.20% | 16.50% |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  |  |  |  |  |  | 35.00% |
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability |  | $ 47.0 |  |  |  |  |  |
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability, Toll Charge |  | 49.0 |  |  |  |  |  |
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability, Other Than Toll Charge |  | $ (2.0) |  |  |  |  |  |
Deferred Tax Liabilities, Undistributed Foreign Earnings |  |  |  |  |  |  |  | $ 12.0
Foreign Tax Authority [Member] |  |  |  |  |  |  |  |
Deferred Tax Liabilities, Undistributed Foreign Earnings |  |  |  |  |  |  |  | 11.8
Domestic Tax Authority [Member] |  |  |  |  |  |  |  |
Deferred Tax Liabilities, Undistributed Foreign Earnings |  |  |  |  |  |  |  | $ 0.2
Other Long-term Liabilities [Member] |  |  |  |  |  |  |  |
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability, Toll Charge, Noncurrent | $ 38.5 |  |  |  |  |  |  |
Accrued Income Taxes [Member] |  |  |  |  |  |  |  |
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability, Toll Charge, Current | $ 3.4 |  |  |  |  |  |  |
IXYS Corporation [Member] |  |  |  |  |  |  |  |
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability, Toll Charge |  |  |  | $ 10.0 |  |  |  |
Scenario, Forecast [Member] |  |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  |  |  |  |  | 21.00% |  |

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