Note 1 - Summary of Significant Accounting Policies (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2017	Jan. 01, 2017	Jan. 03, 2016
Research and Development Expense	$ 14,000,000	$ 14,300,000	$ 14,500,000
Cash Equivalents, at Carrying Value	0	0
Interest Paid, Net	6,300,000	5,500,000	4,800,000
Income Taxes Paid	19,100,000	12,800,000	7,200,000
Proceeds from Income Tax Refunds	100,000	200,000	3,100,000
Interest Costs Capitalized	600,000	500,000	300,000
Depreciation	29,500,000	30,100,000	30,400,000
Finite-Lived Intangible Assets, Accumulated Amortization	77,300,000
Goodwill, Impaired, Accumulated Impairment Loss	212,600,000
Goodwill	68,754,000	61,218,000
Other Intangible Assets, Net	600,000	1,000,000
Amortization of Intangible Assets	700,000	500,000	300,000
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	$ 4,100,000	5,500,000
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax	$ 31,600,000	$ (19,000,000)	$ (32,600,000)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	0	0	0
Accrual for Environmental Loss Contingencies	$ 0	$ 0
Short-term Investments	$ 0	0
Luxury Vinyl Tile Products [Member]
Product Warranty Period	15 years
Restructuring Charges [Member]
Impairment of Intangible Assets (Excluding Goodwill)		$ 3,400,000
Minimum [Member] | Carpet Products [Member]
Product Warranty Period	10 years
Maximum [Member] | Carpet Products [Member]
Product Warranty Period	20 years
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