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Schedule II - Valuation and Qualifying Accounts | 12 Months Ended
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Dec. 31, 2020
Notes to Financial Statements |
SEC Schedule, 12-09, Schedule of Valuation and Qualifying Accounts Disclosure [Text Block] | Schedule II NORTHWEST PIPE COMPANY VALUATION AND QUALIFYING ACCOUNTS (Dollars in thousands)
|  | Balance at Beginning of Period |  |  | Charged to Profit and Loss |  |  | Deduction from Reserves |  |  | Balance at End of Period |
Year Ended December 31, 2020: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | 801 |  |  |  | 430 |  |  |  | (464 | ) |  | $ | 767 |
Valuation allowance for deferred income tax assets |  |  | 6,126 |  |  |  | 240 |  |  |  | (138 | ) |  |  | 6,228 |
Year Ended December 31, 2019: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | 660 |  |  | $ | 312 |  |  | $ | (171 | ) |  | $ | 801 |
Valuation allowance for deferred income tax assets |  |  | 9,433 |  |  |  | 345 |  |  |  | (3,652 | ) |  |  | 6,126 |
Year Ended December 31, 2018: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | 477 |  |  | $ | 449 |  |  | $ | (266 | ) |  | $ | 660 |
Valuation allowance for deferred income tax assets |  |  | 10,413 |  |  |  | 1,785 |  |  |  | (2,765 | ) |  |  | 9,433 |

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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=120395691&loc=d3e24092-122690 + Details
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