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v2.4.1.9

Note 9 - Preferred Stock (Details) (USD $) | 12 Months Ended |
--- | --- | ---
Dec. 28, 2014 | Dec. 29, 2013
Note 9 - Preferred Stock (Details) [Line Items] |  |
Preferred Stock, Shares Authorized | 5,000,000 us-gaap_PreferredStockSharesAuthorized |
Preferred Stock, Par or Stated Value Per Share | $ 1.00 us-gaap_PreferredStockParOrStatedValuePerShare |
Preferred Stock, Shares Issued | 0 us-gaap_PreferredStockSharesIssued | 0 us-gaap_PreferredStockSharesIssued
Number of Purchase Right | 1 tile_NumberOfPurchaseRight |
Percentage of Acquisition of Outstanding Common Stock Causing Dilution | 15.00%tile_PercentageOfAcquisitionOfOutstandingCommonStockCausingDilution |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ 90 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 |
Minimum Preferential Dividend per Share | $ 1.00 tile_MinimumPreferentialDividendPerShare |
Dividend Declared Rate Over per Common Stock | 100 tile_DividendDeclaredRateOverPerCommonStock |
Preferred Stock, Liquidation Preference Per Share | $ 1.00 us-gaap_PreferredStockLiquidationPreference |
Series B Preferred Stock [Member] |  |
Note 9 - Preferred Stock (Details) [Line Items] |  |
Number of Votes per share Entitled to Preferred Stock Holders | 100 tile_NumberOfVotesPerShareEntitledToPreferredStockHolders / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |

X
- Definition Represents the rate of a declared dividend on each share of Common Stock. + References No definition available. + Details
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Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the minimum amount of preferential dividend per share. + References No definition available. + Details
Name: | tile_MinimumPreferentialDividendPerShare
Namespace Prefix: | tile_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Details
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X
- Definition Represents the number of purchase rights. + References No definition available. + Details
Name: | tile_NumberOfPurchaseRight
Namespace Prefix: | tile_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of votes a holder of preferred stock is entitled to per held share. + References No definition available. + Details
Name: | tile_NumberOfVotesPerShareEntitledToPreferredStockHolders
Namespace Prefix: | tile_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the percentage of common stock acquired that causes dilution. + References No definition available. + Details
Name: | tile_PercentageOfAcquisitionOfOutstandingCommonStockCausingDilution
Namespace Prefix: | tile_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(4)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition The per share liquidation preference (or restrictions) of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21484-112644 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph d -Article 4 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(d)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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X
- Definition Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29 -Article 5 + Details
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Balance Type: | na
Period Type: | instant

X
- Definition The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29 -Article 5 + Details
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Period Type: | instant

X
- Definition Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29 -Article 5 + Details
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- Details
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