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

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Estimated Cost To Complete Approved Projects And Current Construction In Progress

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