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Note 14 - Discontinued Operations (Details) (USD $) | 12 Months Ended
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Dec. 28, 2014 | Dec. 29, 2013 | Dec. 30, 2012
Note 14 - Discontinued Operations (Details) [Line Items] |  |  |
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest | $ 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | $ 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | $ (16,956,000)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
Bentley Prince Street [Member] |  |  |
Note 14 - Discontinued Operations (Details) [Line Items] |  |  |
Gain (Loss) on Disposition of Business |  |  | (8,600,000)us-gaap_GainLossOnSaleOfBusiness / us-gaap_IncomeStatementLocationAxis = tile_BentleyPrinceStreetMember
Direct Cost to Sell Business Segment Included in Loss from Discontinued Operations |  |  | 5,900,000 tile_DirectCostToSellBusinessSegmentIncludedInLossFromDiscontinuedOperations / us-gaap_IncomeStatementLocationAxis = tile_BentleyPrinceStreetMember
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest |  |  | $ (2,500,000)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax / us-gaap_IncomeStatementLocationAxis = tile_BentleyPrinceStreetMember

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- Definition Direct cost to sell business segment included in loss from discontinued operations. + References No definition available. + Details
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- Definition Gain (loss) from sale or disposal of an organization or integrated set of activities (for example, but not limited to, a partnership or corporation) engaged in providing a product or service in a commercial, industrial, or professional environment. + References No definition available. + Details
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- Definition Amount of income (loss) from a disposal group, net of income tax before extraordinary items allocable to noncontrolling interests. Includes, net of tax, income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e957-107759 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.12) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 13 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.14) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Article 5 + Details
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