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

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- Definition

Company Owned Life Insurance Assets Fair Value Disclosure

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No definition available.

+ Details

Name:	tile_CompanyOwnedLifeInsuranceAssetsFairValueDisclosure
Namespace Prefix:	tile_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant