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Note 2 - Revenue Recognition - Disaggregation of Revenue (Details)	9 Months Ended
	Sep. 30, 2018
Americas [Member]
Percentage of net sales	58.70%
Europe [Member]
Percentage of net sales	26.20%
Asia Pacific [Member]
Percentage of net sales	15.10%

X

- Definition

The percent of revenue due to direct sales to customers.

+ References

No definition available.

+ Details

Name:	tile_PercentOfRevenueDueToSalesToCustomers
Namespace Prefix:	tile_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	srt_StatementGeographicalAxis=srt_AmericasMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementGeographicalAxis=srt_EuropeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementGeographicalAxis=srt_AsiaPacificMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: