XML 48 R32.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Note 11 - Income (Loss) Per Share (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2017
Notes Tables |
Distributed And Undistributed Earnings [Table Text Block] |
|  | Fiscal Year |
|  | 201 7 |  |  | 20 16 |  |  | 20 15 |
Earnings per share: |  |  |  |  |  |  |  |  |  |  |  |
Basic earnings per share |  |  |  |  |  |  |  |  |  |  |  |
Distributed earnings |  | $ | 0.25 |  |  | $ | 0.22 |  |  | $ | 0.18 |
Undistributed earnings |  |  | 0.61 |  |  |  | 0.61 |  |  |  | 0.92 |
|  | $ | 0.86 |  |  | $ | 0.83 |  |  | $ | 1.10 |
Diluted earnings per share |  |  |  |  |  |  |  |  |  |  |  |
Distributed earnings |  | $ | 0.25 |  |  | $ | 0.22 |  |  | $ | 0.18 |
Undistributed earnings |  |  | 0.61 |  |  |  | 0.61 |  |  |  | 0.92 |
|  | $ | 0.86 |  |  | $ | 0.83 |  |  | $ | 1.10 |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  | Fiscal Year |
|  | 20 17 |  |  | 201 6 |  |  | 201 5 |
|  | (in millions) |
Net income attributable to participating securities |  | $ | 0.4 |  |  | $ | 0.4 |  |  | $ | 1.6 |
|  | Fiscal Year |
|  | 201 7 |  |  | 201 6 |  |  | 20 15 |
|  | (in thousands) |
Weighted Average Shares Outstanding |  |  | 61,528 |  |  |  | 64,593 |  |  |  | 64,557 |
Participating Securities |  |  | 468 |  |  |  | 505 |  |  |  | 1,470 |
Shares for Basic Earnings Per Share |  |  | 61,996 |  |  |  | 65,098 |  |  |  | 66,027 |
Dilutive Effect of Stock Options |  |  | 44 |  |  |  | 38 |  |  |  | 48 |
Shares for Diluted Earnings Per Share |  |  | 62,040 |  |  |  | 65,136 |  |  |  | 66,075 |

X
- Definition Distributed and undistributed earnings. + References No definition available. + Details
Name: | tile_DistributedAndUndistributedEarningsTableTextBlock
Namespace Prefix: | tile_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
Name: | us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_TableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration