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Note 4 - Fair Value of Financial Instruments (Details Textual) $ in Millions | Jan. 01, 2017 USD ($)
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Company Owned Life Insurance Assets Fair Value Disclosure | $ 23.1

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- Definition Company Owned Life Insurance Assets Fair Value Disclosure + References No definition available. + Details
Name: | tile_CompanyOwnedLifeInsuranceAssetsFairValueDisclosure
Namespace Prefix: | tile_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant