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Note 3 - Earnings Per Share (Details) - Distributed and Undistributed Earnings (USD $) | 3 Months Ended | 6 Months Ended
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Jun. 30, 2013 | Jul. 01, 2012 | Jun. 30, 2013 | Jul. 01, 2012
Basic Earnings Per Share Attributable to Common Stockholders: |  |  |  |
Basic earnings per share attributable to common stockholders | $ 0.17 | $ 0.16 | $ 0.27 | $ 0.07
Diluted Earnings Per Share Attributable to Common Stockholders: |  |  |  |
Diluted earnings per share attributable to common stockholders | $ 0.17 | $ 0.16 | $ 0.27 | $ 0.07
Basic earnings (loss) per share attributable to Interface, Inc. common shareholders |  |  |  |
Basic earnings per share attributable to Interface, Inc. common shareholders | $ 0.00 | $ 0.00 | $ 0.00 | $ 0.00
Diluted earnings (loss) per share attributable to Interface, Inc. common shareholders |  |  |  |
Diluted earnings per share attributable to Interface, Inc. common shareholders | $ 0.00 | $ 0.00 | $ 0.00 | $ 0.00
Basic earnings per share attributable to Interface, Inc. common shareholders | $ 0.17 | $ 0.16 | $ 0.27 | $ 0.07
Diluted earnings per share attributable to Interface, Inc. common shareholders | $ 0.17 | $ 0.16 | $ 0.27 | $ 0.07
Distributed Earnings [Member] |  |  |  |
Basic Earnings Per Share Attributable to Common Stockholders: |  |  |  |
Basic earnings per share attributable to common stockholders | $ 0.03 | $ 0.02 | $ 0.05 | $ 0.04
Diluted Earnings Per Share Attributable to Common Stockholders: |  |  |  |
Diluted earnings per share attributable to common stockholders | $ 0.03 | $ 0.02 | $ 0.05 | $ 0.04
Basic earnings (loss) per share attributable to Interface, Inc. common shareholders |  |  |  |
Basic earnings per share attributable to Interface, Inc. common shareholders | $ 0.00 | $ 0.00 | $ 0.00 | $ 0.00
Diluted earnings (loss) per share attributable to Interface, Inc. common shareholders |  |  |  |
Diluted earnings per share attributable to Interface, Inc. common shareholders | $ 0.00 | $ 0.00 | $ 0.00 | $ 0.00
Undistributed Earnings [Member] |  |  |  |
Basic Earnings Per Share Attributable to Common Stockholders: |  |  |  |
Basic earnings per share attributable to common stockholders | $ 0.14 | $ 0.14 | $ 0.22 | $ 0.03
Diluted Earnings Per Share Attributable to Common Stockholders: |  |  |  |
Diluted earnings per share attributable to common stockholders | $ 0.14 | $ 0.14 | $ 0.22 | $ 0.03
Basic earnings (loss) per share attributable to Interface, Inc. common shareholders |  |  |  |
Basic earnings per share attributable to Interface, Inc. common shareholders | $ 0.00 | $ 0.00 | $ 0.00 | $ 0.00
Diluted earnings (loss) per share attributable to Interface, Inc. common shareholders |  |  |  |
Diluted earnings per share attributable to Interface, Inc. common shareholders | $ 0.00 | $ 0.00 | $ 0.00 | $ 0.00

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