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Note 6 - Property and Equipment (Details Textual) $ in Millions | Dec. 31, 2017 USD ($)
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Estimated Cost To Complete Approved Projects And Current Construction In Progress | $ 61.5

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- Definition Estimated Cost To Complete Approved Projects And Current Construction In Progress + References No definition available. + Details
Name: | tile_EstimatedCostToCompleteApprovedProjectsAndCurrentConstructionInProgress
Namespace Prefix: | tile_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant