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Note 1 - Summary of Significant Accounting Policies (Details Textual) - USD ($) shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Jan. 01, 2017 | Jan. 03, 2016 | Dec. 28, 2014
Research and Development Expense | $ 14,300 | $ 14,500 | $ 13,900
Accrual for Environmental Loss Contingencies | 0 | 0 |
Interest Paid | 5,500 | 4,800 | 21,000
Income Taxes Paid | 12,800 | 7,200 | 7,500
Proceeds from Income Tax Refunds | 200 | 3,100 | 5,000
Interest Costs Capitalized | 500 | 300 | 800
Depreciation | 30,100 | 30,400 | 30,300
Finite-Lived Intangible Assets, Accumulated Amortization | 77,300 | 77,300 |
Goodwill, Impaired, Accumulated Impairment Loss | 212,600 | 212,600 |
Goodwill | 61,218 | 63,890 |
Other Intangible Assets, Net | 900 | 4,800 |
Amortization of Intangible Assets | $ 500 | 300 | 300
Fair Value Estimates of Reporting Units, Threshold for No Goodwill Impairment, Percent of Decrease in Fair Value Estimates | 10.00% |  |
Product Warranty Period Lower Range | 10 years |  |
Product Warranty Period Upper Range | 20 years |  |
Workmanship Warranty Period | 1 year |  |
Warranty and Sales Allowances Payable, Current | $ 5,529 | 4,759 |
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax | (19,000) | (32,600) | (28,400)
Allowance for Doubtful Accounts Receivable | 3,800 | 4,500 |
Cash Equivalents, at Carrying Value | 0 | 0 |
Short-term Investments | 0 | 0 |
Goodwill, Impairment Loss | $ 0 | $ 0 | $ 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | 0 | 0 | 0
Restructuring and Asset Impairment Charges [Member] |  |  |
Capitalized Patent Defense Costs, Impairment | $ 3,400 |  |
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 Equipment [Member] | Minimum [Member] |  |  |
Property, Plant and Equipment, Useful Life | 3 years |  |
Furniture and Equipment [Member] | Maximum [Member] |  |  |
Property, Plant and Equipment, Useful Life | 12 years |  |

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