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v3.19.2

Note 8 - Leases (Details Textual) | 6 Months Ended
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Jun. 30, 2019
Lessee, Lease, Renewal Term | 5 years
Minimum [Member] |
Lessee, Lease, Term of Contract | 1 year
Maximum [Member] |
Lessee, Lease, Term of Contract | 20 years

X
- Definition Term of lessee's operating and finance leases renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | tile_LesseeLeaseRenewalTerm
Namespace Prefix: | tile_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Term of lessee's operating and finance leases, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | tile_LesseeLeaseTermOfContract
Namespace Prefix: | tile_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |