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Note 2 - Recent Accounting Pronouncements (Details) (USD $) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 30, 2014 | Dec. 29, 2013 | Dec. 28, 2014
Note 2 - Recent Accounting Pronouncements (Details) [Line Items] |  |  |
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent |  | $ 34,162,000 us-gaap_DeferredTaxAssetsNetNoncurrent | $ 33,138,000 us-gaap_DeferredTaxAssetsNetNoncurrent
Presentation of Unrecognized Tax Benefits [Member] |  |  |
Note 2 - Recent Accounting Pronouncements (Details) [Line Items] |  |  |
Increase (Decrease) in Other Noncurrent Liabilities | (21,800,000)us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities / us-gaap_AdjustmentsForNewAccountingPronouncementsAxis = tile_PresentationOfUnrecognizedTaxBenefitsMember | (21,800,000)us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities / us-gaap_AdjustmentsForNewAccountingPronouncementsAxis = tile_PresentationOfUnrecognizedTaxBenefitsMember |
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent | $ (21,800,000)us-gaap_DeferredTaxAssetsNetNoncurrent / us-gaap_AdjustmentsForNewAccountingPronouncementsAxis = tile_PresentationOfUnrecognizedTaxBenefitsMember | $ (21,800,000)us-gaap_DeferredTaxAssetsNetNoncurrent / us-gaap_AdjustmentsForNewAccountingPronouncementsAxis = tile_PresentationOfUnrecognizedTaxBenefitsMember |

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- Definition Amount after allocation of valuation allowances of noncurrent deferred tax asset attributable to deductible temporary differences and carryforwards. Noncurrent assets are expected to be realized or consumed after one year (or the normal operating cycle, if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=37586315&loc=d3e31917-109318 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=37586315&loc=d3e31931-109318 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=37586315&loc=d3e31928-109318 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=37586315&loc=d3e31958-109318 + Details
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