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Schedule II - Valuation and Qualifying Accounts | 12 Months Ended
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Dec. 31, 2018
Notes to Financial Statements |
SEC Schedule, 12-09, 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, 2018, 2017 and 2016 Accounts receivable, allowance for doubtful accounts:
|  | 2018 |  | 2017 |  | 2016
Balance at beginning of year |  | $ | 652 |  |  | $ | 567 |  |  | $ | 499 |
Provision for bad debt |  |  | (50 | ) |  |  | 116 |  |  |  | 126 |
Write-offs, net of recoveries |  |  | (38 | ) |  |  | (31 | ) |  |  | (58 | )
Balance at end of year |  | $ | 564 |  |  | $ | 652 |  |  | $ | 567 |

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- Definition The entire disclosure for valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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