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Note 3 - Earnings Per Share (Details) - Distributed and Undistributed Earnings (USD $)
3 Months Ended 9 Months Ended
Sep. 29, 2013
Sep. 30, 2012
Sep. 29, 2013
Sep. 30, 2012
Basic Earnings Per Share from Continuing Operations:        
Basic earnings per share attributable to Interface, Inc. common shareholders $ 0.23 $ 0.17 $ 0.50 $ 0.24
Diluted Earnings Per Share from Continuing Operations:        
Diluted earnings per share attributable to Interface, Inc. common shareholders $ 0.23 $ 0.17 $ 0.50 $ 0.24
Earnings (Loss) Per Share        
Continuing Operations $ 0.23 $ 0.17 $ 0.50 $ 0.24
Discontinued Operations $ 0.00 $ (0.26) $ 0.00 $ (0.26)
Earnings (Loss) Per Share $ 0.23 $ (0.09) $ 0.50 $ (0.02)
Distributed Earnings [Member]
       
Basic Earnings Per Share from Continuing Operations:        
Basic earnings per share attributable to Interface, Inc. common shareholders $ 0.03 $ 0.03 $ 0.08 $ 0.07
Diluted Earnings Per Share from Continuing Operations:        
Diluted earnings per share attributable to Interface, Inc. common shareholders $ 0.03 $ 0.03 $ 0.08 $ 0.07
Undistributed Earnings [Member]
       
Basic Earnings Per Share from Continuing Operations:        
Basic earnings per share attributable to Interface, Inc. common shareholders $ 0.20 $ 0.14 $ 0.42 $ 0.17
Diluted Earnings Per Share from Continuing Operations:        
Diluted earnings per share attributable to Interface, Inc. common shareholders $ 0.20 $ 0.14 $ 0.42 $ 0.17