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Schedule II - Valuation and Qualifying Accounts | 12 Months Ended
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Dec. 31, 2024
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, 2024: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for credit losses |  | $ | 121 |  |  | $ | 625 |  |  | $ | (504 | ) |  | $ | 242 |
Valuation allowance for deferred income tax assets |  |  | 6,641 |  |  |  | (790 | ) |  |  | (142 | ) |  |  | 5,709 |
Year Ended December 31, 2023: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for credit losses |  | $ | 369 |  |  | $ | 189 |  |  | $ | (437 | ) |  | $ | 121 |
Valuation allowance for deferred income tax assets |  |  | 6,051 |  |  |  | 696 |  |  |  | (106 | ) |  |  | 6,641 |
Year Ended December 31, 2022: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for credit losses |  | $ | 503 |  |  | $ | 442 |  |  | $ | (576 | ) |  | $ | 369 |
Valuation allowance for deferred income tax assets |  |  | 5,899 |  |  |  | 254 |  |  |  | (102 | ) |  |  | 6,051 |

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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 -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 09 -Publisher SEC Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480678/235-10-S99-4 + Details
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