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Schedule II - Valuations and Qualifying Accounts | 12 Months Ended
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Dec. 31, 2016
Notes to Financial Statements |
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, 2016: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | 751 |  |  | $ | 295 |  |  | $ | (531 | ) |  | $ | 515 |
Valuation allowance for deferred tax assets |  |  | 7,057 |  |  |  | 1,160 |  |  |  | - |  |  |  | 8,217 |
Year ended December 31, 2015: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | 755 |  |  | $ | 416 |  |  | $ | (420 | ) |  | $ | 751 |
Valuation allowance for deferred tax assets |  |  | 1,858 |  |  |  | 5,217 |  |  |  | (18 | ) |  |  | 7,057 |
Year ended December 31, 2014: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | 685 |  |  | $ | 411 |  |  | $ | (341 | ) |  | $ | 755 |
Valuation allowance for deferred tax assets |  |  | 1,894 |  |  |  | 26 |  |  |  | (62 | ) |  |  | 1,858 |

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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 -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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