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Note 10 - Income Taxes (Details Textual) $ in Millions	3 Months Ended
	Apr. 02, 2017 USD ($)
Unrecognized Tax Benefits, Period Increase (Decrease)	$ 0.3
Unrecognized Tax Benefits	28.2
Increase (Decrease) in Deferred Tax Assets	$ (5.0)

X

- Definition

The increase (decrease) during the reporting period in the account that represents the deferred tax asset attributable to deductible temporary differences and carryforwards.

+ References

No definition available.

+ Details

Name:	tile_IncreaseDecreaseInDeferredTaxAssets
Namespace Prefix:	tile_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of unrecognized tax benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15A
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319

+ Details

Name:	us-gaap_UnrecognizedTaxBenefits
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of increase (decrease) in unrecognized tax benefits attributable to uncertain tax positions taken in tax returns.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15A
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319

+ Details

Name:	us-gaap_UnrecognizedTaxBenefitsPeriodIncreaseDecrease
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration