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Note 1 - Summary of Significant Accounting Policies (Details Textual) - USD ($) shares in Thousands, $ in Thousands |  | 12 Months Ended
--- | --- | ---
Aug. 07, 2018 | Dec. 30, 2018 | Dec. 31, 2017 | Jan. 01, 2017
Percent of Revenue Due to Contracts With Customers |  | 100.00% |  |
Percent of Warranty Claims to Revenue |  | 0.30% |  |
Research and Development Expense, Total |  | $ 16,400 | $ 14,000 | $ 14,300
Cash Equivalents, at Carrying Value, Total |  | 0 | 0 |
Short-term Investments, Total |  | 0 | 0 |
Interest Paid, Excluding Capitalized Interest, Operating Activities |  | 13,800 | 6,300 | 5,500
Income Taxes Paid |  | 29,500 | 19,100 | 12,800
Proceeds from Income Tax Refunds |  | 800 | 100 | 200
Interest Costs Capitalized |  | 700 | 600 | 500
Depreciation, Total |  | 37,600 | 29,500 | 30,100
Finite-Lived Intangible Assets, Accumulated Amortization |  | 77,300 | 77,300 |
Goodwill, Impaired, Accumulated Impairment Loss |  | 212,600 | 212,600 |
Goodwill, Ending Balance |  | 245,815 | 68,754 |
Goodwill, Purchase Accounting Adjustments |  | $ 1,377 |  |
Number of Operating Segments |  | 3 |  |
Other Intangible Assets, Net |  | $ 97,700 | 600 |
Amortization of Intangible Assets, Total |  | 5,387 | 0 | 0
Goodwill, Impairment Loss |  | $ 0 | 0 | 0
Fair Value Estimates of Reporting Units, Threshold for No Goodwill Impairment, Percent of Decrease in Fair Value Estimates |  | 10.00% |  |
Workmanship Warranty Period |  | 1 year |  |
Standard Product Warranty Accrual, Ending Balance |  | $ 3,500 | 4,100 |
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent, Total |  | $ (22,544) | $ 31,579 | $ (19,011)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  | 0 | 0 | 0
Accrual for Environmental Loss Contingencies, Ending Balance |  | $ 0 | $ 0 |
Restructuring Charges [Member] |  |  |  |
Impairment of Intangible Assets (Excluding Goodwill), Total |  |  |  | $ 3,400
Nora [Member] |  |  |  |
Goodwill, Ending Balance | $ 184,725 | 184,700 |  |
Finite-Lived Intangible Assets, Net, Ending Balance | 103,300 | 97,700 |  |
Goodwill, Purchase Accounting Adjustments | 1,400 | 1,400 |  |
Business Acquisition, Goodwill, Expected Tax Deductible Amount | $ 0 | 0 |  |
Amortization of Intangible Assets, Total |  | $ 5,400 | $ 700 | $ 500
Building and Building Improvements [Member] | Minimum [Member] |  |  |  |
Property, Plant and Equipment, Useful Life |  | 10 years |  |
Building and Building Improvements [Member] | Maximum [Member] |  |  |  |
Property, Plant and Equipment, Useful Life |  | 40 years |  |
Furniture and Fixtures [Member] | Minimum [Member] |  |  |  |
Property, Plant and Equipment, Useful Life |  | 3 years |  |
Furniture and Fixtures [Member] | Maximum [Member] |  |  |  |
Property, Plant and Equipment, Useful Life |  | 12 years |  |
Carpet, Modular Resilient Flooring, and Related Products [Member] |  |  |  |
Percent of Revenue Due to Contracts With Customers |  | 97.00% |  |
Carpet Products [Member] | Minimum [Member] |  |  |  |
Product Warranty Period |  | 10 years |  |
Carpet Products [Member] | Maximum [Member] |  |  |  |
Product Warranty Period |  | 20 years |  |
Luxury Vinyl Tile Products [Member] | Minimum [Member] |  |  |  |
Product Warranty Period |  | 5 years |  |
Luxury Vinyl Tile Products [Member] | Maximum [Member] |  |  |  |
Product Warranty Period |  | 15 years |  |

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