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Note 11 - Income (Loss) Per Share (Details) - Calculation of Income (Loss) Per Share (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 28, 2014 | Sep. 28, 2014 | Jun. 29, 2014 | Mar. 30, 2014 | Dec. 29, 2013 | Sep. 29, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 28, 2014 | Dec. 29, 2013 | Dec. 30, 2012
Note 11 - Income (Loss) Per Share (Details) - Calculation of Income (Loss) Per Share [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations (in Dollars) |  |  |  |  |  |  |  |  |  |  |  | $ 24,808 us-gaap_IncomeLossFromContinuingOperations | $ 48,255 us-gaap_IncomeLossFromContinuingOperations | $ 22,899 us-gaap_IncomeLossFromContinuingOperations
Net income (in Dollars) | 15,336 us-gaap_NetIncomeLoss | [1] | 14,957 us-gaap_NetIncomeLoss | 10,965 us-gaap_NetIncomeLoss | 6,997 us-gaap_NetIncomeLoss | 8,088 us-gaap_NetIncomeLoss | [2] | (376)us-gaap_NetIncomeLoss | [3] | 13,071 us-gaap_NetIncomeLoss | 4,025 us-gaap_NetIncomeLoss |  |  |
Shares for Basic Earnings Per Share |  |  |  |  |  |  |  |  |  |  |  | 66,389 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 66,194 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 65,767 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Dilutive Effect of Stock Options |  |  |  |  |  |  |  |  |  |  |  | 59 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements | 103 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements | 133 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Shares for Diluted Earnings Per Share |  |  |  |  |  |  |  |  |  |  |  | 66,448 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 66,297 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 65,900 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Participating Securities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note 11 - Income (Loss) Per Share (Details) - Calculation of Income (Loss) Per Share [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations (in Dollars) |  |  |  |  |  |  |  |  |  |  |  | 500 us-gaap_IncomeLossFromContinuingOperations / us-gaap_IncomeStatementLocationAxis = tile_ParticipatingSecuritiesMember | 1,200 us-gaap_IncomeLossFromContinuingOperations / us-gaap_IncomeStatementLocationAxis = tile_ParticipatingSecuritiesMember | 700 us-gaap_IncomeLossFromContinuingOperations / us-gaap_IncomeStatementLocationAxis = tile_ParticipatingSecuritiesMember
Net income (in Dollars) |  |  |  |  |  |  |  |  |  |  |  | $ 500 us-gaap_NetIncomeLoss / us-gaap_IncomeStatementLocationAxis = tile_ParticipatingSecuritiesMember | $ 1,200 us-gaap_NetIncomeLoss / us-gaap_IncomeStatementLocationAxis = tile_ParticipatingSecuritiesMember | $ 200 us-gaap_NetIncomeLoss / us-gaap_IncomeStatementLocationAxis = tile_ParticipatingSecuritiesMember
Weighted Average Shares Outstanding |  |  |  |  |  |  |  |  |  |  |  | 64,998 tile_WeightedAverageSharesOutstandingBasicExcludingParticipatingSecurities / us-gaap_IncomeStatementLocationAxis = tile_ParticipatingSecuritiesMember | 64,486 tile_WeightedAverageSharesOutstandingBasicExcludingParticipatingSecurities / us-gaap_IncomeStatementLocationAxis = tile_ParticipatingSecuritiesMember | 63,793 tile_WeightedAverageSharesOutstandingBasicExcludingParticipatingSecurities / us-gaap_IncomeStatementLocationAxis = tile_ParticipatingSecuritiesMember
Participating Securities |  |  |  |  |  |  |  |  |  |  |  | 1,391 tile_ParticipatingSecurities / us-gaap_IncomeStatementLocationAxis = tile_ParticipatingSecuritiesMember | 1,708 tile_ParticipatingSecurities / us-gaap_IncomeStatementLocationAxis = tile_ParticipatingSecuritiesMember | 1,974 tile_ParticipatingSecurities / us-gaap_IncomeStatementLocationAxis = tile_ParticipatingSecuritiesMember
[1] | The fourth quarter of 2013 includes a gain of $7.0 million related to final settlement of the Company's fire insurance claim in Australia. The fourth quarter of 2013 also includes $1.7 million of expenses related to debt retirement.
[2] | Results for the fourth quarter of 2014 include debt retirement expenses of $12.0 million.
[3] | Results for the third quarter of 2014 include restructuring and asset impairment charges of $12.4 million.

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