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Note 3 - Earnings Per Share (Tables) | 6 Months Ended
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Jun. 30, 2013
Earnings Per Share [Abstract] |
Distributed And Undistributed Earnings [Table Text Block] |
|  | Three Months Ended |  |  | Six Months Ended |
|  | June 30, 2013 |  |  | July 1, 2012 |  |  | June 30, 2013 |  |  | July 1, 2012 |
Earnings Per Share from Continuing Operations: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic Earnings Per Share Attributable to Common Stockholders: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributed Earnings |  | $ | 0.03 |  |  | $ | 0.02 |  |  | $ | 0.05 |  |  | $ | 0.04 |
Undistributed Earnings |  |  | 0.14 |  |  |  | 0.14 |  |  |  | 0.22 |  |  |  | 0.03 |
Total |  | $ | 0.17 |  |  | $ | 0.16 |  |  | $ | 0.27 |  |  | $ | 0.07 |
Diluted Earnings Per Share Attributable to Common Stockholders: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributed Earnings |  | $ | 0.03 |  |  | $ | 0.02 |  |  | $ | 0.05 |  |  | $ | 0.04 |
Undistributed Earnings |  |  | 0.14 |  |  |  | 0.14 |  |  |  | 0.22 |  |  |  | 0.03 |
Total |  | $ | 0.17 |  |  | $ | 0.16 |  |  | $ | 0.27 |  |  | $ | 0.07 |
Earnings (Loss) Per Share from Discontinued Operations: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic earnings (loss) per share attributable to Interface, Inc. common shareholders |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributed earnings |  | $ | 0.00 |  |  | $ | 0.00 |  |  | $ | 0.00 |  |  | $ | 0.00 |
Undistributed earnings |  |  | 0.00 |  |  |  | 0.00 |  |  |  | 0.00 |  |  |  | 0.00 |
|  | $ | 0.00 |  |  | $ | 0.00 |  |  | $ | 0.00 |  |  | $ | 0.00 |
Diluted earnings (loss) per share attributable to Interface, Inc. common shareholders |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributed earnings |  | $ | 0.00 |  |  | $ | 0.00 |  |  | $ | 0.00 |  |  | $ | 0.00 |
Undistributed earnings |  |  | 0.00 |  |  |  | 0.00 |  |  |  | 0.00 |  |  |  | 0.00 |
|  | $ | 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 |
Net Income Attributable To Company [Table Text Block] |
|  | Three Months Ended |  |  | Six Months Ended |
|  | June 30, 2013 |  |  | July 1, 2012 |  |  | June 30, 2013 |  |  | July 1, 2012 |
|  |  |  |  |  | (In millions) |  |  |  |  |
Net Income |  | $ | 0.3 |  |  | $ | 0.3 |  |  | $ | 0.5 |  |  | $ | 0.1 |
Schedule of Weighted Average Number of Shares [Table Text Block] |
|  | Three Months Ended |  |  | Six Months Ended |
|  | June 30, 2013 |  |  | July 1, 2012 |  |  | June 30, 2013 |  |  | July 1, 2012 |
|  |  |  |  |  | (In thousands) |  |  |  |  |
Weighted Average Shares Outstanding |  |  | 64,486 |  |  |  | 63,927 |  |  |  | 64,453 |  |  |  | 63,676 |
Participating Securities |  |  | 1,694 |  |  |  | 2,025 |  |  |  | 1,694 |  |  |  | 2,025 |
Shares for Basic Earnings Per Share |  |  | 66,180 |  |  |  | 65,952 |  |  |  | 66,148 |  |  |  | 65,701 |
Dilutive Effect of Stock Options |  |  | 149 |  |  |  | 176 |  |  |  | 149 |  |  |  | 167 |
Shares for Diluted Earnings Per Share |  |  | 66,329 |  |  |  | 66,128 |  |  |  | 66,297 |  |  |  | 65,868 |

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- Definition Tabular disclosure of the weighted average number of shares used in calculating basic net earnings per share (or unit) and diluted earnings per share (or unit). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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