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Note 13 - Taxes on Income (Details Textual) - USD ($) $ in Thousands | 12 Months Ended | 24 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 30, 2018 | Dec. 31, 2017 | Jan. 01, 2017 | Jan. 03, 2016 | Dec. 31, 2017 | Dec. 21, 2017 | Dec. 28, 2014
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  | 35.00% | 35.00% | 35.00% |  |  |
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount |  | $ 11,707 | $ 0 | $ 0 |  |  |
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability |  | 3,500 |  |  |  |  |
Deferred Tax Assets, Operating Loss Carryforwards, Foreign |  | 3,800 |  |  | $ 3,800 |  |
Operating Loss Carryforwards, Valuation Allowance |  | 1,186 | 2,500 |  | 1,186 |  |
Increase (Decrease) in Deferred Tax Assets |  | $ (3,300) | $ (5,000) |  |  |  |
Effective Income Tax Rate Reconciliation, Percent |  | 47.00% | 31.60% | 31.50% |  |  |
Deferred Tax Liabilities, Undistributed Foreign Earnings |  | $ 0 | $ 1,481 |  | 0 |  |
Unrecognized Tax Benefits |  | 29,221 | 27,888 | $ 28,271 | 29,221 |  | $ 27,301
Unrecognized Tax Benefits that Would Impact Effective Tax Rate |  | 29,200 |  |  | 29,200 |  |
Unrecognized Tax Benefits That Would Require To Settle Through Cash |  | 25,900 |  |  | 25,900 |  |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued |  | 1,600 |  |  | 1,600 |  |
Discontinued Operations [Member] |  |  |  |  |  |  |
Deferred Tax Assets, Operating Loss Carryforwards, State and Local |  | 57,300 |  |  | 57,300 |  |
Domestic Tax Authority [Member] |  |  |  |  |  |  |
Operating Loss Carryforwards, Share-based Compensation |  | 23,200 | $ 9,000 |  | 23,200 |  |
Income Tax Benefit, Share-based Payment Awards |  | 8,100 |  |  |  |  |
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net |  |  |  |  | 3,200 |  |
Adjustments to Additional Paid in Capital, Income Tax Deficiency from Share-based Compensation |  | $ 3,100 |  |  |  |  |
Domestic Tax Authority [Member] | Earliest Tax Year [Member] |  |  |  |  |  |  |
Open Tax Year |  | 2003 |  |  |  |  |
State and Local Jurisdiction [Member] |  |  |  |  |  |  |
Operating Loss Carryforwards, Share-based Compensation |  | $ 21,400 |  |  | 21,400 |  |
Income Tax Benefit, Share-based Payment Awards |  | 1,300 |  |  |  |  |
Operating Loss Carryforwards |  | 108,600 |  |  | 108,600 |  |
Operating Loss Carryforwards, Valuation Allowance |  | $ 18,500 |  |  | 18,500 |  |
State and Local Jurisdiction [Member] | Earliest Tax Year [Member] |  |  |  |  |  |  |
Open Tax Year |  | 2012 |  |  |  |  |
Foreign Tax Authority [Member] | Earliest Tax Year [Member] |  |  |  |  |  |  |
Open Tax Year |  | 2006 |  |  |  |  |
Foreign Tax Authority [Member] | Foreign Tax Authorities Excluding Canada [Member] |  |  |  |  |  |  |
Undistributed Earnings of Foreign Subsidiaries |  | $ 307,000 |  |  | 307,000 | $ 350,000 |
Repatriation Amount Previously Deemed Indefinitely Reinvested Earnings |  | 37,000 |  |  | 37,000 |  |
Provisional Estimate For Foreign Withholding and US State Taxes |  | 600 |  |  |  |  |
Foreign Tax Authority [Member] | Canada Revenue Agency [Member] |  |  |  |  |  |  |
Repatriation Amount Previously Deemed Indefinitely Reinvested Earnings |  | 6,000 |  |  | 6,000 |  |
Deferred Tax Liabilities, Undistributed Foreign Earnings |  | 2,000 |  |  | 2,000 |  |
Foreign Withholding Taxes Related to Undistributed Earnings Not Deemed Indefinitely Reinvested |  | 300 |  |  | $ 300 |  |
Deferred Income Taxes On Undistributed Earnings Not Deemed Indefinitely Reinvested, Reversal Amount |  | $ (2,000) |  |  |  |  |
Scenario, Forecast [Member] |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 21.00% |  |  |  |  |  |

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