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Valuation and Qualifying Accounts | 12 Months Ended
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Dec. 31, 2012
Valuation and Qualifying Accounts [Abstract] |
VALUATION AND QUALIFYING ACCOUNTS | VALUATION AND QUALIFYING ACCOUNTS 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, 2012: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | 1,650 |  |  | $ | 1,381 |  |  | $ | (1,283 | ) |  | $ | 1,748 |
Valuation allowance for deferred tax assets |  |  | 926 |  |  |  | 14 |  |  |  | — |  |  |  | 940 |
Year ended December 31, 2011: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | 2,151 |  |  | $ | 3,518 |  |  | $ | (4,019 | ) |  | $ | 1,650 |
Valuation allowance for deferred tax assets |  |  | 105 |  |  |  | 872 |  |  |  | (51 | ) |  |  | 926 |
Year ended December 31, 2010: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | 793 |  |  | $ | 3,118 |  |  | $ | (1,760 | ) |  | $ | 2,151 |
Valuation allowance for deferred tax assets |  |  | 470 |  |  |  | — |  |  |  | (365 | ) |  |  | 105 |

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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 SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e24092-122690 + Details
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