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Note 3 - Revenue Recognition (Details Textual) | 12 Months Ended
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Dec. 30, 2018
Percent of Revenue Due to Contracts With Customers | 100.00%
Carpet, Modular Resilient Flooring, and Related Products [Member] |
Percent of Revenue Due to Contracts With Customers | 97.00%
Installation of Carpet and Other Flooring Related Material [Member] |
Percent of Revenue Due to Sales To Customers | 3.00%

X
- Definition The percentage of revenue that is derived from contracts with customers. + References No definition available. + Details
Name: | tile_PercentOfRevenueDueToContractsWithCustomers
Namespace Prefix: | tile_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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_ProductOrServiceAxis=tile_CarpetModularResilientFlooringAndRelatedProductsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=tile_InstallationOfCarpetAndOtherFlooringRelatedMaterialMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |