Document And Entity Information Eric Stokes [Member] Represents Eric Stokes. ecd_TrdArrIndTitle Trading Arrangement, Individual Title Statistical Measurement [Axis] us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount Richard Roman [MEmber] Represents Richard Roman. ecd_TrdArrIndName Trading Arrangement, Individual Name Note To Financial Statement Details Textual Michael Wray [Member] REpresents Michael Wray. Note 2 - Business Combination ecd_TrdArrAdoptionDate Trading Arrangement Adoption Date Note 3 - Inventories Income tax expense Fair Value Measurement Inputs and Valuation Techniques [Table] Pension Plan [Member] ecd_NonRule10b51ArrTrmntdFlag Non-Rule 10b5-1 Arrangement Terminated [Flag] Note 4 - Intangible Assets ecd_NonRule10b51ArrAdoptedFlag Non-Rule 10b5-1 Arrangement Adopted [Flag] Keith Larson Two [Member] Represents Keith Larson Two. Note 5 - Fair Value Measurements Transferred at Point in Time [Member] Trading Arrangements, by Individual [Table] Note 7 - Share-based Compensation Material Terms of Trading Arrangement [Text Block] Note 9 - Revenue Note 11 - Net Income Per Share Note 12 - Segment Information Note 2 - Business Combination - Recognized Assets Acquired and Liabilities Assumed (Details) Note 2 - Business Combination - Acquired Intangible Assets (Details) Minimum [Member] us-gaap_StockRepurchasedAndRetiredDuringPeriodShares Stock Repurchased and Retired During Period, Shares (in shares) Repurchase of common stock (in shares) Note 3 - Inventories - Components of Inventories (Details) Note 4 - Intangible Assets - Summary of Intangible Assets (Details) Statistical Measurement [Domain] Note 4 - Intangible Assets - Summary of Estimated Amortization Expense (Details) Maximum [Member] ecd_TrdArrSecuritiesAggAvailAmt Trading Arrangement, Securities Aggregate Available Amount Note 5 - Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) Share Repurchase Program [Axis] Note 7 - Share-based Compensation - Share-based Compensation Expense (Details) Share Repurchase Program [Domain] Note 7 - Share-based Compensation - RSU and PSA Activity (Details) Note 9 - Revenue - Disaggregation of Revenue (Details) Note 11 - Net Income per Share - Loss per Basic and Diluted Weighted Average Common Share Outstanding for Continuing and Discontinued Operations (Details) Retirement Plan Type [Domain] Note 12 - Segment Information - Information Related to the Operations of the Company's Operating Segments (Details) Notes To Financial Statements Notes To Financial Statements [Abstract] Retirement Plan Type [Axis] us-gaap_CostDepreciationAmortizationAndDepletion Cost, Depreciation, Amortization and Depletion Cash flows from operating activities: Supplies nwpx_PerformanceShareAwardTargetLevelPercentage Performance Share Award Target Level, Percentage Represents the target level percentage for performance share awards. Cash flows from investing activities: us-gaap_NetCashProvidedByUsedInOperatingActivities Net cash provided by operating activities Raw materials Cash flows from financing activities: Work-in-process us-gaap_NetCashProvidedByUsedInInvestingActivities Net cash used in investing activities Intangible Asset, Finite-Lived, and Capitalized Cost, Software to be Sold, Leased, or Marketed, Estimated Amortization Expense [Table Text Block] us-gaap_NetCashProvidedByUsedInFinancingActivities Net cash used in financing activities Finished goods Counterparty Name [Axis] us-gaap_EffectiveIncomeTaxRateContinuingOperations Effective Income Tax Rate Reconciliation, Percent us-gaap_AssetsFairValueDisclosure Total financial assets Trade and other receivables, net of allowance of $504 and $528 Operating Segments [Member] Accounting Policies [Abstract] Water Transmission Systems [Member] Represents the Water Transmission Systems. Performance Shares [Member] Segments [Domain] Accrued payment for repurchase of common stock Represents the total amount of payments accrued for the repurchase of common stock. us-gaap_DeferredCompensationPlanAssets Deferred compensation plan Accounting Standards Update and Change in Accounting Principle [Text Block] Segments [Axis] Income Statement [Abstract] Counterparty Name [Domain] us-gaap_IncreaseDecreaseInInventories Inventories us-gaap_SharesOutstanding Balances (in shares) Balances (in shares) us-gaap_NumberOfOperatingSegments Number of Operating Segments us-gaap_NumberOfReportableSegments Number of Reportable Segments Segment Reporting [Text Block] Award Type [Axis] Segment Reporting [Table Text Block] Net income Net income Adjustments to reconcile net income to net cash provided by operating activities: Share Repurchase Program [Member] Represents information regarding the share repurchase program. Preferred stock, $.01 par value, 10,000,000 shares authorized, none issued or outstanding us-gaap_Liabilities Total liabilities us-gaap_AmortizationOfIntangibleAssets Amortization of intangible assets Consolidation Items [Axis] us-gaap_LiabilitiesAndStockholdersEquity Total liabilities and stockholders’ equity us-gaap_AllocatedShareBasedCompensationExpense Total Title and Position [Axis] Segment Reporting [Table] us-gaap_OtherCommitment Other Commitment us-gaap_OtherNoncashIncomeExpense Other, net us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets Prepaid expenses and other assets Selling, General and Administrative Expense Depreciation and finance lease amortization The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives and amount of amortization expense attributable to right-of-use asset from finance lease. us-gaap_ShareBasedCompensation Share-based compensation expense Consolidation Items [Domain] Portland Harbor Superfund Site [Member] Represents the Portland Harbor Superfund Site. Income Tax Disclosure [Text Block] Aaron Wilkins [Member] Represents Aaron Wilkins. 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Statement [Table] Fair Value Hierarchy and NAV [Domain] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Measurement Frequency [Domain] Deferred Compensation Plan [Member] Represents deferred compensation plan. us-gaap_RepaymentsOfLongTermDebt Payments on other debt us-gaap_RepaymentsOfLinesOfCredit Repayments on line of credit Right-of-use assets obtained in exchange for operating lease liabilities Statement of Financial Position [Abstract] Right-of-use assets obtained in exchange for finance lease liabilities us-gaap_FinanceLeasePrincipalPayments Payments on finance lease liabilities Trademarks and Trade Names [Member] us-gaap_DerivativeLiabilities Derivative liabilities us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber Unvested RSUs and PSAs (in shares) Unvested RSUs and PSAs (in shares) us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue Unvested RSUs and PSAs, weighted average grant date fair value (in dollars per share) Unvested RSUs and PSAs, weighted average grant date fair value (in dollars per share) srt_StockRepurchaseProgramAuthorizedAmount1 Share Repurchase Program, Authorized, Amount RSUs and PSAs granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) RSUs and PSAs granted, weighted average grant date fair value (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) Environmental Remediation Site [Domain] us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod Unvested RSUs and PSAs canceled (in shares) Environmental Remediation Site [Axis] Borrowings on line of credit RSUs and PSAs vested, weighted average grant date fair value (in dollars per share) Fair Value, Recurring [Member] us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod RSUs and PSAs vested (in shares) Accrued liabilities nwpx_BusinessCombinationRecognizedLiabilityAssumedAccruedLiabilities Amount of accrued liabilities assumed in business combination and recognized at acquisition date. nwpx_IntangibleAssetFinitelivedEstimatedAmortizationExpenseAfterYearFour Thereafter Amount of amortization expense for finite-lived intangible asset expected to be recognized after fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). Excludes goodwill and capitalized cost for software to be sold, leased, or marketed. Other assets us-gaap_IncreaseDecreaseInAccountsAndOtherReceivables Trade and other receivables us-gaap_PaymentsForRepurchaseOfCommonStock Repurchase of common stock Document Type Document Information [Line Items] Document Quarterly Report Catch Basin Machine [Member] Represents a catch basin machine. Document Information [Table] Pipe Profiler Equipment [Member] Represents pipe profiler equipment. us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1 Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period (Year) nwpx_SharebasedPaymentArrangementExpenseCostOfSales Cost of sales Amount of expense for award under share-based payment arrangement included in cost of sales. nwpx_SharebasedPaymentArrangementExpenseSellingGeneralAndAdministrativeExpense Selling, general, and administrative expense Amount of expense for award under share-based payment arrangement included in selling, general, and administrative expense. us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) Effect of potentially dilutive common shares (in shares) Entity Interactive Data Current Measurement Frequency [Axis] Document Transition Report Commitments and Contingencies Disclosure [Text Block] us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding Diluted (in shares) Diluted weighted-average common shares outstanding (in shares) Statement [Line Items] Fair Value Hierarchy and NAV [Axis] Common stock, shares issued (in shares) Net income per share: Common stock, shares outstanding (in shares) Award Type [Domain] Common stock, shares authorized (in shares) us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1 Share Repurchase Program, Remaining Authorized, Amount Basic weighted-average common shares outstanding (in shares) Basic (in shares) Derivative Instrument [Axis] Basic (in dollars per share) Basic (in dollars per share) Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Earnings Per Share, Diluted, by Common Class, Including Two-Class Method [Table] Common stock, $.01 par value, 15,000,000 shares authorized, 9,640,002 and 9,587,990 shares issued and outstanding as of June 30, 2026 and December 31, 2025, respectively Effective Income Tax Rate Reconciliation [Table] us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo 2028 Title and Position [Domain] us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree 2029 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths 2027 Business Combination, Recognized Asset Acquired and Liability Assumed [Table Text Block] Accounts payable us-gaap_PolicyTextBlockAbstract Accounting Policies us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear Remainder of 2026 us-gaap_DisclosureTextBlockAbstract Notes to Financial Statements Share Repurchase Program Authorized December 11, 2025 [Member] Represents the share repurchase program authorized December 11, 2025. us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour 2030 us-gaap_TableTextBlock Notes Tables Share Repurchase Program Authorized October 10, 2023 [Member] Represents the share repurchase program authorized October 10, 2023. us-gaap_ProceedsFromLinesOfCredit Borrowings on line of credit Intangible assets, net Total amortization expense Document Fiscal Period Focus Intangible Assets, Gross Document Fiscal Year Focus us-gaap_ComprehensiveIncomeNetOfTax Comprehensive income Amendment Flag Common Stock [Member] Goodwill Accrued liabilities Document Period End Date Long-Lived Asset, Class [Domain] Legal Entity [Axis] Business Combination [Domain] Noncash operating lease expense Entity File Number us-gaap_RevenueRemainingPerformanceObligation Revenue, Remaining Performance Obligation, Amount Operating lease liabilities Entity Tax Identification Number Noncash investing and financing activities: Business Combination [Axis] Current portion of operating lease liabilities Transferred over Time [Member] Disaggregation of Revenue [Table Text Block] Disaggregation of Revenue [Table] Entity [Domain] Entity Central Index Key us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired Business Combination, Voting Equity Interest Acquired, Percentage Entity Registrant Name Entity Current Reporting Status Business Combination [Table] Entity Incorporation, State or Country Code Stock Awards [Member] Represents stock awards. Current portion of long-term debt Timing of Transfer of Good or Service [Axis] Timing of Transfer of Good or Service [Domain] Current Fiscal Year End Date Trade and other receivables us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables Inventories us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax Pension liability adjustment, tax expense/benefit Capitalization, Equity [Table] Cash and cash equivalents us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents us-gaap_ContractWithCustomerPerformanceObligationSatisfiedInPreviousPeriod Contract with Customer, Performance Obligation Satisfied in Previous Period Long-term debt Entity Filer Category us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets Total assets acquired Entity Shell Company us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities Total liabilities assumed Entity Emerging Growth Company Capital Addition Purchase Commitments [Member] Entity Small Business Boughton’s Precast, Inc. [Member] Represents Boughton’s Precast, Inc. us-gaap_OperatingIncomeLoss Operating income Intangible assets us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet Total purchase consideration Accounts payable us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable us-gaap_DerivativeAssets Derivative assets Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Property and equipment us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment Schedule Of Inventory Current And Non Current [Table Text Block] Tabular disclosure of the carrying amount as of the balance sheet date of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process. Includes current and non-current inventory balances. us-gaap_InterestExpense Interest expense us-gaap_ContractWithCustomerLiabilityRevenueRecognized Contract with Customer, Liability, Revenue Recognized us-gaap_BusinessCombinationConsiderationTransferred1 Business Combination, Consideration Transferred us-gaap_LossContingencyAccrualCarryingValueCurrent Loss Contingency, Accrual, Current Other comprehensive income (loss), net of tax: Entity Address, State or Province Statement of Stockholders' Equity [Abstract] Intangible Asset, Finite-Lived, Class [Axis] Inventory, Current [Table] Entity Address, City or Town nwpx_EstimatedCostOfEPASelectedRemedy Estimated Cost of EPA Selected Remedy The estimated cost of the remedy selected by EPA. nwpx_EstimatedTimeToCompleteSelectedEPARemedy Estimated Time to Complete Selected EPA Remedy (Year) The estimated amount of time to complete the selected EPA remedy. Loss Contingency Nature [Axis] Statement of Comprehensive Income [Abstract] Retained earnings Intangible Asset, Finite-Lived, Class [Domain] Entity Address, Address Line One Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] nwpx_NumberOfPotentiallyResponsibleParties Number Of Potentially Responsible Parties Number of potentially responsible parties for Portland Harbor Superfund site. Contract assets Statement of Cash Flows [Abstract] City Area Code us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual Business Combination, Acquiree's Revenue since Acquisition Date, Actual Portland Harbor Natural Resources Trustee Council [Member] The name or description of the loss contingency by its nature. us-gaap_RevenueRemainingPerformanceObligationPercentage Revenue, Remaining Performance Obligation, Percentage us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent Pension liability adjustment, net of tax expense of $0 Pension liability adjustment us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation Tax withholdings related to net share settlements of equity awards Local Phone Number nwpx_NumberOfActiveStockIncentivePlans Number Of Active Stock Incentive Plans The number of active stock incentive plans. Entity Address, Postal Zip Code Revenue from Contract with Customer [Text Block] nwpx_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumberAtTargetLevelOfPerformance Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number At Target Level Of Performance (in shares) The number of non-vested equity-based payment instruments at a target level of performance, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. nwpx_PerformanceAwardsIssuedMultiplier Performance Awards Issued Multiplier The percentage of the performance awards issued multiplier. us-gaap_IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities Accrued and other liabilities us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent Other comprehensive income (loss), net of tax Stockholders’ equity: Title of 12(b) Security Restricted Stock Units and Performance Stock Awards [Member] The type or description of the award. Equity Components [Axis] Security Exchange Name Trading Symbol us-gaap_IncreaseDecreaseInOperatingLeaseLiability Operating lease liabilities Class of Stock [Axis] Equity Component [Domain] Fair Value, Inputs, Level 2 [Member] nwpx_CommonStockCapitalSharesReservedForFutureIssuancePercentageVestingOfOutstandingPSAsAssumed Common Stock, Capital Shares Reserved for Future Issuance, Percentage Vesting of Outstanding PSAs Assumed Represents the vesting percentage of PSAs used as an assumption to determine the number of capital shares reserved for future issuance. Fair Value, Inputs, Level 3 [Member] Equity [Text Block] Fair Value, Inputs, Level 1 [Member] AOCI Attributable to Parent [Member] Entity Common Stock, Shares Outstanding Additional Paid-in Capital [Member] Retained Earnings [Member] Earnings Per Share [Text Block] Cost of sales Loss Contingency, Nature [Domain] Scott Montross [Member] Represents Scott Montross. Director [Member] Property and equipment, less accumulated depreciation and amortization of $159,559 and $153,364 Accrued property and equipment purchases us-gaap_BusinessCombinationAcquisitionRelatedCosts Business Combination, Acquisition-Related Cost, Expense Deferred income taxes Shares used in per share calculations: us-gaap_PaymentsForProceedsFromOtherInvestingActivities Other investing activities Common stock, par value (in dollars per share) Share-based compensation expense Intangible Asset and Goodwill [Text Block] Derivative Contract [Domain] Other income (expense) Other financing activities Long-Lived Asset, Class [Axis] us-gaap_Assets Total assets us-gaap_DeferredIncomeTaxLiabilitiesNet Deferred income taxes Cash and cash equivalents Fair Value Disclosures [Text Block] Intangible Asset, Finite-Lived, Acquired [Table Text Block] Current liabilities: Allowance for doubtful accounts us-gaap_LiabilitiesCurrent Total current liabilities Diluted (in dollars per share) Diluted (in dollars per share) us-gaap_LettersOfCreditOutstandingAmount Letters of Credit Outstanding, Amount Contract liabilities us-gaap_ProceedsFromLegalSettlements Proceeds from Legal Settlements Acquired intangible assets, fair value Interest income Interest Rate Swap [Member] Customer Relationships [Member] Inventory Disclosure [Text Block] Other Commitments [Table] Property and equipment, accumulated depreciation and amortization Individual [Axis] Intangible Asset, Finite-Lived [Table Text Block] Accumulated other comprehensive income (loss) Intangible Asset, Finite-Lived [Table] us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization Intangible Assets, Accumulated amortization Inventories Total inventories us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired Acquisition of business, net of cash acquired All Individuals [Member] Schedule of Unvested Restricted Stock Units and Performance Share Awards Activity [Table Text Block] Tabular disclosure of the change in restricted stock units (RSUs) and performance share awards (PSAs). Other Commitments [Axis] Other Commitments [Domain] us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest Income before income taxes Business Combination [Text Block] Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] Additional paid-in-capital us-gaap_StockholdersEquity Total stockholders’ equity Balances Balances Unvested RSUs and PSAs canceled, weighted average grant date fair value (in dollars per share) Lower Willamette Group [Member] Refers to information regarding the Lower Willamette Group. us-gaap_IncreaseDecreaseInContractWithCustomerAsset Contract assets, net Prepaid expenses and other us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1 Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) us-gaap_PaymentsToAcquirePropertyPlantAndEquipment Purchases of property and equipment Issuance of common stock under stock compensation plans, net of tax withholdings Patents [Member] us-gaap_StockRepurchasedAndRetiredDuringPeriodValue Stock Repurchased and Retired During Period, Value Repurchase of common stock Foreign Exchange Forward [Member] Consolidation, Less-than-Wholly-Owned Subsidiary, Parent Ownership Interest, Effect of Change [Table] Current assets: us-gaap_OperatingLeaseRightOfUseAsset Operating lease right-of-use assets us-gaap_AssetsCurrent Total current assets Other long-term liabilities Issuance of common stock under stock compensation plans, net of tax withholdings (in shares) ecd_Rule10b51ArrTrmntdFlag Rule 10b5-1 Arrangement Terminated [Flag] ecd_Rule10b51ArrAdoptedFlag Rule 10b5-1 Arrangement Adopted [Flag] Net sales Gross profit Gross profit Goodwill [Table] Commitments and contingencies (Note 8)