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Schedule II - Valuation and Qualifying Accounts and Reserves | 12 Months Ended
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Dec. 31, 2017
Notes to Financial Statements |
Schedule of Valuation and Qualifying Accounts Disclosure [Text Block] | I NTERFACE, INC. AND SUBSIDIARIES SCHEDULE II – VALUATION AND QUALIFYING ACCOUNTS AND RESERVES
|  | COLUMN A BALANCE, AT BEGINNING OF YEAR |  |  | COLUMN B CHARGED TO COSTS AND EXPENSES (A) |  |  | COLUMN C CHARGED TO OTHER ACCOUNTS |  |  | COLUMN D DEDUCTIONS (DESCRIBE) (B) |  |  | COLUMN E BALANCE, AT END OF YEAR |
|  | (in thousands) |
Allowance for Doubtful Accounts: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Year Ended: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
December 31, 2017 |  | $ | 3,780 |  |  | $ | 635 |  |  | $ | 0 |  |  | $ | 922 |  |  | $ | 3,493 |
January 1, 2017 |  |  | 4,479 |  |  |  | (243 | ) |  |  | 0 |  |  |  | 456 |  |  |  | 3,780 |
January 3, 2016 |  |  | 5,896 |  |  |  | 212 |  |  |  | 0 |  |  |  | 1,629 |  |  |  | 4,479 |
______________ (A) Includes changes in foreign currency exchange rates. (B) Wri te off of bad debt, and recovering of previously provided for amounts.
|  | COLUMN A BALANCE, AT BEGINNING OF YEAR |  |  | COLUMN B CHARGED TO COSTS AND EXPENSES (A) |  |  | COLUMN C CHARGED TO OTHER ACCOUNTS(B) |  |  | COLUMN D DEDUCTIONS (DESCRIBE) (C) |  |  | COLUMN E BALANCE, AT END OF YEAR |
|  | (in thousands) |
Restructuring Reserve: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Year Ended: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
December 31, 2017 |  | $ | 10,291 |  |  | $ | 3,999 |  |  | $ | 3,300 |  |  | $ | 3,724 |  |  | $ | 2,568 |
January 1, 2017 |  |  | 104 |  |  |  | 11,769 |  |  |  | 8,019 |  |  |  | 1,582 |  |  |  | 10,291 |
January 3, 2016 |  |  | 7,179 |  |  |  | (481 | ) |  |  | 0 |  |  |  | 6,594 |  |  |  | 104 |
______________ (A) Includes changes in foreign currency exchange rates. (B) Direct reduction of asset carrying value, not included in restructuring reserve. (C) Cash payments.
|  | COLUMN A BALANCE, AT BEGINNING OF YEAR |  |  | COLUMN B CHARGED TO COSTS AND EXPENSES (A) |  |  | COLUMN C CHARGED TO OTHER ACCOUNTS |  |  | COLUMN D DEDUCTIONS (DESCRIBE) (B) |  |  | COLUMN E BALANCE, AT END OF YEAR |
|  | (in thousands) |
Warranty and Sales Allowances Reserves : |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Year ended : |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
December 31, 2017 |  | $ | 5,529 |  |  | $ | 2,071 |  |  | $ | 0 |  |  | $ | 3,489 |  |  | $ | 4,111 |
January 1, 2017 |  |  | 4,759 |  |  |  | 3,149 |  |  |  | 0 |  |  |  | 2,379 |  |  |  | 5,529 |
January 3, 2016 |  |  | 3,954 |  |  |  | 2,584 |  |  |  | 0 |  |  |  | 1,779 |  |  |  | 4,759 |
______________ (A) Includes changes in foreign currency exchange rates. (B) Represents credits and costs applied against reserve and adjustments to reflect actual exposure. (All other Schedules for which provision is made in the applicable accounting requirements of the Securities and Exchange Commission are omitted because they are either not applicable or the required information is shown in the Company's Consolidated Financial Statements or the Notes thereto.)

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- References No definition available. + Details
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- Definition The entire disclosure for any allowance and reserve accounts (their beginning and ending balances, as well as a reconciliation by type of activity during the period). Alternatively, disclosure of the required information may be within the footnotes to the financial statements or a supplemental schedule to the financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -URI http://asc.fasb.org/topic&trid=2122369 + Details
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