XML 52 R21.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Note 5 - Stock-Based Compensation (Tables) | 6 Months Ended
--- | ---
Jun. 29, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] |
|  | Shares |  |  | Weighted Average Exercise Price |
Outstanding at December 29, 2013 |  |  | 184,000 |  |  | $ | 8.18 |
Granted |  |  | 0 |  |  |  | 0 |
Exercised |  |  | 20,500 |  |  |  | 4.31 |
Forfeited or canceled |  |  | 2,500 |  |  |  | 1.49 |
Outstanding at June 29, 2014 |  |  | 161,000 |  |  | $ | 8.99 |
Exercisable at June 29, 2014 |  |  | 161,000 |  |  | $ | 8.99 |
Cash Proceeds and Intrinsic Value Related to Stock Options Exercised [Table Text Block] |
|  | Six Months Ended |
|  | June 29, 2014 |  |  | June 30, 2013 |
|  | (In thousands) |
Proceeds from stock options exercised |  | $ | 159 |  |  | $ | 1,256 |
Intrinsic value of stock options exercised |  |  | 299 |  |  |  | 741 |
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block] |
|  | Shares |  |  | Weighted Average Grant Date Fair Value |
Outstanding at December 29, 2013 |  |  | 1,707,500 |  |  | $ | 15.62 |
Granted |  |  | 490,000 |  |  |  | 21.28 |
Vested |  |  | 526,000 |  |  |  | 16.26 |
Forfeited or canceled |  |  | 211,000 |  |  |  | 17.08 |
Outstanding at June 29, 2014 |  |  | 1,460,500 |  |  | $ | 17.08 |

X
- Definition Cash proceeds and intrinsic value related to stock options exercised. + References No definition available. + Details
Name: | tile_CashProceedsAndIntrinsicValueRelatedToStockOptionsExercisedTableTextBlock
Namespace Prefix: | tile_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ScheduleOfShareBasedCompensationRestrictedStockUnitsAwardActivityTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration