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Schedule II - Valuation and Qualifying Accounts | 12 Months Ended
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Dec. 31, 2017
Notes to Financial Statements |
Schedule of Valuation and Qualifying Accounts Disclosure [Text Block] | Schedule II UFP TECHNOLOGIES, INC. Consolidated Financial Statement Schedule Valuation and Qualifying Accounts Years ended December 31, 2017, 2016 and 2015 Accounts receivable, allowance for doubtful accounts:
|  | 2017 |  | 2016 |  | 2015
Balance at beginning of year |  | $ | 567 |  |  | $ | 499 |  |  | $ | 502 |
Provision for bad debt |  |  | 116 |  |  |  | 126 |  |  |  | 16 |
Write-offs, net of recoveries |  |  | (31 | ) |  |  | (58 | ) |  |  | (19 | )
Balance at end of year |  | $ | 652 |  |  | $ | 567 |  |  | $ | 499 |

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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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