$NWPX
NORTHWEST PIPE CO Stock $nwpx

$nwpx Overview Financials Valuation SEC Filings Company Website

2021 Q4 Form 10-K Financial Statement

#000143774922006431 Filed on March 16, 2022

Income Statement

Concept	2021 Q4	2021 Q3	2021 Q2
Revenue	$102.5M	$84.64M	$73.81M
YoY Change	47.8%	9.03%	5.49%
Cost Of Revenue	$88.97M	$72.28M	$64.27M
YoY Change	56.09%	16.56%	12.74%
Gross Profit	$13.58M	$12.36M	$9.538M
YoY Change	9.83%	-20.85%	-26.39%
Gross Profit Margin	13.24%	14.61%	12.92%
Selling, General & Admin	$7.893M	$5.562M	$6.337M
YoY Change	36.09%	-1.66%	13.48%
% of Gross Profit	58.13%	44.99%	66.44%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$4.319M	$2.869M	$3.416M
YoY Change	19.64%	-21.83%	-11.04%
% of Gross Profit	31.81%	23.21%	35.81%
Operating Expenses	$7.893M	$5.562M	$6.337M
YoY Change	36.09%	-1.66%	13.48%
Operating Profit	$5.685M	$6.801M	$3.201M
YoY Change	-13.38%	-31.74%	-56.59%
Interest Expense	-$515.0K	$112.0K	$348.0K
YoY Change	157.5%	-52.94%	32.82%
% of Operating Profit	-9.06%	1.65%	10.87%
Other Income/Expense, Net	$68.00K	$171.0K	$30.00K
YoY Change	-32.0%	8.92%	-97.17%
Pretax Income	$2.638M	$6.860M	$2.883M
YoY Change	-59.42%	-30.69%	-64.76%
Income Tax	$367.0K	$1.914M	$752.0K
% Of Pretax Income	13.91%	27.9%	26.08%
Net Earnings	$2.271M	$4.946M	$2.131M
YoY Change	-56.5%	-31.94%	-64.47%
Net Earnings / Revenue	2.21%	5.84%	2.89%
Basic Earnings Per Share	$0.23	$0.50	$0.22
Diluted Earnings Per Share	$0.23	$0.50	$0.21
COMMON SHARES
Basic Shares Outstanding	9.871M	9.871M	9.861M
Diluted Shares Outstanding		9.921M	9.915M

Balance Sheet

Concept	2021 Q4	2021 Q3	2021 Q2
SHORT-TERM ASSETS
Cash & Short-Term Investments	$2.997M	$3.188M	$23.20M
YoY Change	-92.09%	-89.51%	20.82%
Cash & Equivalents	$2.997M	$3.188M	$23.20M
Short-Term Investments
Other Short-Term Assets	$5.744M	$1.915M	$4.035M
YoY Change	10.46%	-43.68%	6.18%
Inventory	$59.65M	$43.04M	$30.03M
Prepaid Expenses
Receivables	$159.8M	$150.1M	$124.3M
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$228.2M	$198.3M	$181.5M
YoY Change	18.89%	6.84%	5.21%
LONG-TERM ASSETS
Property, Plant & Equipment	$121.3M	$111.2M	$110.0M
YoY Change	10.06%	1.82%	1.12%
Goodwill	$53.68M	$22.99M	$22.99M
YoY Change	133.56%	0.0%	0.0%
Intangibles
YoY Change
Long-Term Investments
YoY Change
Other Assets	$6.620M	$6.216M	$6.164M
YoY Change	1.04%	-3.36%	-2.51%
Total Long-Term Assets	$319.5M	$182.7M	$182.6M
YoY Change	76.44%	0.8%	1.9%
TOTAL ASSETS
Total Short-Term Assets	$228.2M	$198.3M	$181.5M
Total Long-Term Assets	$319.5M	$182.7M	$182.6M
Total Assets	$547.7M	$381.0M	$364.1M
YoY Change	46.82%	3.86%	3.52%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$32.27M	$20.15M	$15.46M
YoY Change	148.34%	47.04%	18.8%
Accrued Expenses	$24.50M	$17.41M	$14.99M
YoY Change	45.7%	23.92%	26.2%
Deferred Revenue	$2.623M	$5.388M	$2.722M
YoY Change	-57.62%	18.68%	-42.46%
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due	$0.00	$0.00	$0.00
YoY Change	-100.0%	-100.0%	-100.0%
Total Short-Term Liabilities	$64.09M	$45.34M	$35.58M
YoY Change	39.63%	20.2%	1.37%
LONG-TERM LIABILITIES
Long-Term Debt	$86.76M	$2.153M	$0.00
YoY Change	1373.52%	-80.85%	-100.0%
Other Long-Term Liabilities	$8.734M	$10.77M	$10.64M
YoY Change	-22.07%	-3.06%	1.86%
Total Long-Term Liabilities	$8.734M	$10.77M	$10.64M
YoY Change	-48.91%	-51.83%	-52.66%
TOTAL LIABILITIES
Total Short-Term Liabilities	$64.09M	$45.34M	$35.58M
Total Long-Term Liabilities	$8.734M	$10.77M	$10.64M
Total Liabilities	$264.3M	$100.7M	$89.40M
YoY Change	155.63%	-2.4%	-7.08%
SHAREHOLDERS EQUITY
Retained Earnings	$159.9M	$157.6M	$152.7M
YoY Change	7.77%	10.11%	12.36%
Common Stock	$125.2M	$124.4M	$123.8M
YoY Change	1.67%	1.68%	1.92%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$283.4M	$280.3M	$274.7M
YoY Change
Total Liabilities & Shareholders Equity	$547.7M	$381.0M	$364.1M
YoY Change	46.82%	3.86%	3.52%

Cashflow Statement

Concept	2021 Q4	2021 Q3	2021 Q2
OPERATING ACTIVITIES
Net Income	$2.271M	$4.946M	$2.131M
YoY Change	-56.5%	-31.94%	-64.47%
Depreciation, Depletion And Amortization	$4.319M	$2.869M	$3.416M
YoY Change	19.64%	-21.83%	-11.04%
Cash From Operating Activities	$7.814M	-$18.70M	$5.662M
YoY Change	-38.47%	-228.06%	-58.82%
INVESTING ACTIVITIES
Capital Expenditures	-$5.136M	-$3.348M	-$2.918M
YoY Change	21.42%	-7.51%	-17.8%
Acquisitions
YoY Change
Other Investing Activities	-$87.19M	$203.0K	$1.000K
YoY Change		-81.2%	-99.82%
Cash From Investing Activities	-$92.33M	-$3.145M	-$2.917M
YoY Change	2087.91%	23.82%	-3.09%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	84.33M	1.832M	-9.434M
YoY Change	-9469.44%	-301.32%	686.17%
NET CHANGE
Cash From Operating Activities	7.814M	-18.70M	5.662M
Cash From Investing Activities	-92.33M	-3.145M	-2.917M
Cash From Financing Activities	84.33M	1.832M	-9.434M
Net Change In Cash	-191.0K	-20.01M	-6.689M
YoY Change	-102.52%	-279.46%	-170.12%
FREE CASH FLOW
Cash From Operating Activities	$7.814M	-$18.70M	$5.662M
Capital Expenditures	-$5.136M	-$3.348M	-$2.918M
Free Cash Flow	$12.95M	-$15.35M	$8.580M
YoY Change	-23.51%	-184.24%	-50.4%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2021	dei	Auditor Firm AuditorFirmId	659
CY2021Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	503000	USD
CY2020Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	767000	USD
CY2021Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2020Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2021Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2020Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2021Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	10000000
CY2020Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	10000000
CY2021Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0
CY2021Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0
CY2020Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0
CY2020Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0
CY2021Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2020Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2021Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	15000000
CY2020Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	15000000
CY2021Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	9870567
CY2021Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	9870567
CY2020Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	9805437
CY2019	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-39000	USD
CY2021	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-100152000	USD
CY2020Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	9805437
CY2019	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	5000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTaxParent	20000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	8000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTaxParent	9000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	102000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTaxParent	41000	USD
CY2021	us-gaap	Proceeds From Income Tax Refunds ProceedsFromIncomeTaxRefunds	79000	USD
CY2020	us-gaap	Proceeds From Income Tax Refunds ProceedsFromIncomeTaxRefunds	153000	USD
CY2019	us-gaap	Proceeds From Income Tax Refunds ProceedsFromIncomeTaxRefunds	286000	USD
CY2021Q4	us-gaap	Workers Compensation Liability Current And Noncurrent WorkersCompensationLiabilityCurrentAndNoncurrent	1700000	USD
CY2021	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	0
CY2019	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	0
CY2021	nwpx	Number Of Active Stock Incentive Plans NumberOfActiveStockIncentivePlans	1	pure
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod	0
CY2021	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod	0
CY2021	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	0
CY2021Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	0
CY2021Q4	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1	P1Y
CY2021Q4	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1	P1Y
CY2020Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAccrued	0	USD
CY2021	nwpx	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Tax Expense Benefit AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansTaxExpenseBenefit	577000	USD
CY2020	nwpx	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Tax Expense Benefit AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansTaxExpenseBenefit	679000	USD
CY2021	nwpx	Accumulated Other Comprehensive Income Loss Cumulative Change In Net Gain Loss From Cash Flow Hedge Effect Tax AccumulatedOtherComprehensiveIncomeLossCumulativeChangeInNetGainLossFromCashFlowHedgeEffectTax	61000	USD
CY2020	nwpx	Accumulated Other Comprehensive Income Loss Cumulative Change In Net Gain Loss From Cash Flow Hedge Effect Tax AccumulatedOtherComprehensiveIncomeLossCumulativeChangeInNetGainLossFromCashFlowHedgeEffectTax	20000	USD
CY2021	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	333313000	USD
CY2020	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	285907000	USD
CY2019	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	279317000	USD
CY2021	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	289059000	USD
CY2020	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	235388000	USD
CY2019	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	232133000	USD
CY2021	us-gaap	Gross Profit GrossProfit	44254000	USD
CY2020	us-gaap	Gross Profit GrossProfit	50519000	USD
CY2019	us-gaap	Gross Profit GrossProfit	47184000	USD
CY2021	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	28222000	USD
CY2020	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	24954000	USD
CY2019	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	18495000	USD
CY2021	us-gaap	Operating Income Loss OperatingIncomeLoss	16032000	USD
CY2020	us-gaap	Operating Income Loss OperatingIncomeLoss	25565000	USD
CY2019	us-gaap	Operating Income Loss OperatingIncomeLoss	28689000	USD
CY2021	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	328000	USD
CY2020	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	953000	USD
CY2019	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	4383000	USD
CY2021	us-gaap	Investment Income Interest And Dividend InvestmentIncomeInterestAndDividend	0	USD
CY2020	us-gaap	Investment Income Interest And Dividend InvestmentIncomeInterestAndDividend	49000	USD
CY2019	us-gaap	Investment Income Interest And Dividend InvestmentIncomeInterestAndDividend	40000	USD
CY2021	us-gaap	Interest Expense InterestExpense	1202000	USD
CY2020	us-gaap	Interest Expense InterestExpense	933000	USD
CY2019	us-gaap	Interest Expense InterestExpense	472000	USD
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	15158000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	25634000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	32640000	USD
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	3635000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	6584000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	4738000	USD
CY2021	us-gaap	Net Income Loss NetIncomeLoss	11523000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	19050000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	27902000	USD
CY2021	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.17
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.95
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.86
CY2021	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.16
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.93
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.85
CY2021	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	9854000
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	9788000
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	9741000
CY2021	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	9928000
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	9873000
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	9779000
CY2021	us-gaap	Net Income Loss NetIncomeLoss	11523000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	19050000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	27902000	USD
CY2021	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	-308000	USD
CY2020	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	25000	USD
CY2019	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	-16000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent	-124000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent	-27000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent	-59000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	184000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-52000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-43000	USD
CY2021	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	11707000	USD
CY2020	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	18998000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	27859000	USD
CY2021Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	2997000	USD
CY2020Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	37927000	USD
CY2021Q4	us-gaap	Receivables Net Current ReceivablesNetCurrent	52664000	USD
CY2020Q4	us-gaap	Receivables Net Current ReceivablesNetCurrent	42680000	USD
CY2021Q4	us-gaap	Contract With Customer Asset Net Current ContractWithCustomerAssetNetCurrent	107170000	USD
CY2020Q4	us-gaap	Contract With Customer Asset Net Current ContractWithCustomerAssetNetCurrent	76985000	USD
CY2021Q4	us-gaap	Inventory Net InventoryNet	59651000	USD
CY2020Q4	us-gaap	Inventory Net InventoryNet	29177000	USD
CY2021Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	5744000	USD
CY2020Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	5194000	USD
CY2021Q4	us-gaap	Assets Current AssetsCurrent	228226000	USD
CY2020Q4	us-gaap	Assets Current AssetsCurrent	191963000	USD
CY2021Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	121266000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	110184000	USD
CY2021Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	98507000	USD
CY2020Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	30813000	USD
CY2021Q4	us-gaap	Goodwill Goodwill	53684000	USD
CY2020Q4	us-gaap	Goodwill Goodwill	22985000	USD
CY2021Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	39376000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	10518000	USD
CY2021Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	6620000	USD
CY2020Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	6552000	USD
CY2021Q4	us-gaap	Assets Assets	547679000	USD
CY2020Q4	us-gaap	Assets Assets	373015000	USD
CY2021Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	0	USD
CY2020Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	7701000	USD
CY2021Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	32267000	USD
CY2020Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	12993000	USD
CY2021Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	24498000	USD
CY2020Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	16814000	USD
CY2021Q4	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	2623000	USD
CY2019	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	1709000	USD
CY2020Q4	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	6189000	USD
CY2021Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	4704000	USD
CY2020Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	2204000	USD
CY2021Q4	us-gaap	Liabilities Current LiabilitiesCurrent	64092000	USD
CY2020Q4	us-gaap	Liabilities Current LiabilitiesCurrent	45901000	USD
CY2021Q4	us-gaap	Long Term Line Of Credit LongTermLineOfCredit	86761000	USD
CY2020Q4	us-gaap	Long Term Line Of Credit LongTermLineOfCredit	0	USD
CY2021Q4	us-gaap	Secured Long Term Debt SecuredLongTermDebt	0	USD
CY2020Q4	us-gaap	Secured Long Term Debt SecuredLongTermDebt	5888000	USD
CY2021Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	93725000	USD
CY2020Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	27911000	USD
CY2021Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	10984000	USD
CY2020Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	12481000	USD
CY2021Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	8734000	USD
CY2020Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	11208000	USD
CY2021Q4	us-gaap	Liabilities Liabilities	264296000	USD
CY2020Q4	us-gaap	Liabilities Liabilities	103389000	USD
CY2021Q4	us-gaap	Preferred Stock Value PreferredStockValue	0	USD
CY2020Q4	us-gaap	Preferred Stock Value PreferredStockValue	0	USD
CY2021Q4	us-gaap	Common Stock Value CommonStockValue	99000	USD
CY2020Q4	us-gaap	Common Stock Value CommonStockValue	98000	USD
CY2021Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	125062000	USD
CY2020Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	123013000	USD
CY2021Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	159904000	USD
CY2020Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	148381000	USD
CY2021Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-1682000	USD
CY2020Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-1866000	USD
CY2021Q4	us-gaap	Stockholders Equity StockholdersEquity	283383000	USD
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	269626000	USD
CY2021Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	547679000	USD
CY2020Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	373015000	USD
CY2018Q4	us-gaap	Stockholders Equity StockholdersEquity	218590000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	27902000	USD
CY2019	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	-16000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent	-59000	USD
CY2019	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	-0	USD
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	248158000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	19050000	USD
CY2020	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	25000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent	-27000	USD
CY2020	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	618000	USD
CY2020	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	3088000	USD
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	269626000	USD
CY2021	us-gaap	Net Income Loss NetIncomeLoss	11523000	USD
CY2021	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	-308000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent	-124000	USD
CY2021	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	1166000	USD
CY2021	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	3216000	USD
CY2021Q4	us-gaap	Stockholders Equity StockholdersEquity	283383000	USD
CY2021	us-gaap	Net Income Loss NetIncomeLoss	11523000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	19050000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	27902000	USD
CY2021	us-gaap	Increase Decrease In Accrued Liabilities And Other Operating Liabilities IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities	-7047000	USD
CY2020	us-gaap	Increase Decrease In Accrued Liabilities And Other Operating Liabilities IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities	-90000	USD
CY2019	us-gaap	Increase Decrease In Accrued Liabilities And Other Operating Liabilities IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities	2564000	USD
CY2021	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	-5811000	USD
CY2020	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	56087000	USD
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	42886000	USD
CY2021	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	87215000	USD
CY2020	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	48728000	USD
CY2021	nwpx	Depreciation And Finance Lease Right Of Use Asset Amortization DepreciationAndFinanceLeaseRightOfUseAssetAmortization	11482000	USD
CY2020	nwpx	Depreciation And Finance Lease Right Of Use Asset Amortization DepreciationAndFinanceLeaseRightOfUseAssetAmortization	12344000	USD
CY2019	nwpx	Depreciation And Finance Lease Right Of Use Asset Amortization DepreciationAndFinanceLeaseRightOfUseAssetAmortization	12391000	USD
CY2021	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	2142000	USD
CY2020	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	2207000	USD
CY2019	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	322000	USD
CY2021	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	180000	USD
CY2020	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	2908000	USD
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	4169000	USD
CY2021	nwpx	Gain On Insurance Proceeds GainOnInsuranceProceeds	-0	USD
CY2020	nwpx	Gain On Insurance Proceeds GainOnInsuranceProceeds	1147000	USD
CY2019	nwpx	Gain On Insurance Proceeds GainOnInsuranceProceeds	1641000	USD
CY2021	us-gaap	Share Based Compensation ShareBasedCompensation	3216000	USD
CY2020	us-gaap	Share Based Compensation ShareBasedCompensation	3088000	USD
CY2019	us-gaap	Share Based Compensation ShareBasedCompensation	1709000	USD
CY2021	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-193000	USD
CY2020	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-1889000	USD
CY2019	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-856000	USD
CY2021	us-gaap	Increase Decrease In Accounts And Other Receivables IncreaseDecreaseInAccountsAndOtherReceivables	-392000	USD
CY2020	us-gaap	Increase Decrease In Accounts And Other Receivables IncreaseDecreaseInAccountsAndOtherReceivables	-1563000	USD
CY2019	us-gaap	Increase Decrease In Accounts And Other Receivables IncreaseDecreaseInAccountsAndOtherReceivables	3435000	USD
CY2021	us-gaap	Increase Decrease In Contract With Customer Asset IncreaseDecreaseInContractWithCustomerAsset	33752000	USD
CY2020	us-gaap	Increase Decrease In Contract With Customer Asset IncreaseDecreaseInContractWithCustomerAsset	-8109000	USD
CY2019	us-gaap	Increase Decrease In Contract With Customer Asset IncreaseDecreaseInContractWithCustomerAsset	8379000	USD
CY2021	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	17650000	USD
CY2020	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-7153000	USD
CY2019	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-8649000	USD
CY2021	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	-6727000	USD
CY2020	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	-2514000	USD
CY2019	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	-2454000	USD
CY2021	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	16783000	USD
CY2020	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-3501000	USD
CY2019	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-4675000	USD
CY2019	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	-0	USD
CY2021	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	13262000	USD
CY2020	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	14013000	USD
CY2019	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	8585000	USD
CY2021	us-gaap	Payments To Acquire Intangible Assets PaymentsToAcquireIntangibleAssets	-0	USD
CY2020	us-gaap	Payments To Acquire Intangible Assets PaymentsToAcquireIntangibleAssets	329000	USD
CY2019	us-gaap	Payments To Acquire Intangible Assets PaymentsToAcquireIntangibleAssets	-0	USD
CY2021	us-gaap	Proceeds From Insurance Settlement Investing Activities ProceedsFromInsuranceSettlementInvestingActivities	0	USD
CY2020	us-gaap	Proceeds From Insurance Settlement Investing Activities ProceedsFromInsuranceSettlementInvestingActivities	1637000	USD
CY2019	us-gaap	Proceeds From Insurance Settlement Investing Activities ProceedsFromInsuranceSettlementInvestingActivities	2123000	USD
CY2021	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-325000	USD
CY2020	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-0	USD
CY2020	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-61433000	USD
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-6423000	USD
CY2021	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	122272000	USD
CY2020	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	41377000	USD
CY2019	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	41744000	USD
CY2021	us-gaap	Repayments Of Lines Of Credit RepaymentsOfLinesOfCredit	35511000	USD
CY2020	us-gaap	Repayments Of Lines Of Credit RepaymentsOfLinesOfCredit	41377000	USD
CY2019	us-gaap	Repayments Of Lines Of Credit RepaymentsOfLinesOfCredit	53208000	USD
CY2021	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	0	USD
CY2020	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	15879000	USD
CY2019	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	0	USD
CY2021	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	13762000	USD
CY2020	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	2117000	USD
CY2019	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	-0	USD
CY2021	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	415000	USD
CY2020	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	420000	USD
CY2019	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	434000	USD
CY2021	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	385000	USD
CY2020	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	465000	USD
CY2019	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	228000	USD
CY2021	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	1166000	USD
CY2020	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	618000	USD
CY2019	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	-0	USD
CY2021	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	71033000	USD
CY2020	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	12259000	USD
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-12126000	USD
CY2021	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-34930000	USD
CY2020	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	6913000	USD
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	24337000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	37927000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	31014000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	6677000	USD
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	2997000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	37927000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	31014000	USD
CY2021	us-gaap	Interest Paid Net InterestPaidNet	339000	USD
CY2020	us-gaap	Interest Paid Net InterestPaidNet	599000	USD
CY2019	us-gaap	Interest Paid Net InterestPaidNet	369000	USD
CY2021	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	2481000	USD
CY2020	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	1397000	USD
CY2019	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	-55000	USD
CY2021	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	788000	USD
CY2020	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	325000	USD
CY2019	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	719000	USD
CY2021	nwpx	Noncash Or Part Noncash Acquisition Value Of Consideration Accrued NoncashOrPartNoncashAcquisitionValueOfConsiderationAccrued	911000	USD
CY2020	nwpx	Noncash Or Part Noncash Acquisition Value Of Consideration Accrued NoncashOrPartNoncashAcquisitionValueOfConsiderationAccrued	0	USD
CY2019	nwpx	Noncash Or Part Noncash Acquisition Value Of Consideration Accrued NoncashOrPartNoncashAcquisitionValueOfConsiderationAccrued	0	USD
CY2021	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	16043000	USD
CY2020	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	4471000	USD
CY2019	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	1335000	USD
CY2021	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	853000	USD
CY2020	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	507000	USD
CY2019	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	819000	USD
CY2021	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	2	pure
CY2021	nwpx	Number Of Manufacturing Facilities NumberOfManufacturingFacilities	13	pure
CY2021	us-gaap	Prior Period Reclassification Adjustment Description PriorPeriodReclassificationAdjustmentDescription	<p style="font-family: "Times New Roman"; font-size: 10pt; font-variant: normal; margin: 0pt;"><b>Immaterial Correction of Error</b></p> <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"> </p> <p style="font-family: "Times New Roman"; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt;">The Company recorded revenue of $1.2 million during the <em style="font: inherit;">three</em> and <em style="font: inherit;">twelve</em> months ended <em style="font: inherit;"> December </em><em style="font: inherit;">31,</em> <em style="font: inherit;">2018,</em> which should have been recorded in the <em style="font: inherit;">three</em> months ended <em style="font: inherit;"> March </em><em style="font: inherit;">31,</em> <em style="font: inherit;">2019.</em> The misstatement in the timing of revenue recognition was due to an error in the measurement of costs incurred to date relative to estimated total direct costs at an acquired Ameron Water Transmission Group, LLC facility. Management concluded that this out of period adjustment was <em style="font: inherit;">not</em> material to the consolidated financial results for the year ended <em style="font: inherit;"> December </em><em style="font: inherit;">31,</em> <em style="font: inherit;">2019.</em></p> <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"> </p>
CY2021	us-gaap	Use Of Estimates UseOfEstimates	<p style="font-family: "Times New Roman"; font-size: 10pt; font-variant: normal; margin: 0pt;"><b>Use of Estimates</b></p> <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"> </p> <p style="font-family: "Times New Roman"; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt;">The preparation of the Consolidated Financial Statements in conformity with accounting principles generally accepted in the United States of America (“U.S. GAAP”) requires management to make estimates and judgments that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities as of the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. The Company bases its estimates on historical experience and on various other assumptions that are believed to be reasonable under the circumstances. On an ongoing basis, the Company evaluates all of its estimates, including those related to business combinations, allowance for doubtful accounts, inventories, property and equipment (including depreciation and valuation), goodwill, intangible assets, revenue recognition, share-based compensation, income taxes, and litigation and other contingencies. Actual results <em style="font: inherit;"> may </em>differ from these estimates under different assumptions or conditions.</p> <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"> </p>
CY2021Q4	nwpx	Book Overdrafts BookOverdrafts	4100000	USD
CY2020Q4	nwpx	Book Overdrafts BookOverdrafts	0	USD
CY2020Q4	us-gaap	Workers Compensation Liability Current And Noncurrent WorkersCompensationLiabilityCurrentAndNoncurrent	1700000	USD
CY2021Q4	us-gaap	Accrued Bonuses Current AccruedBonusesCurrent	3716000	USD
CY2020Q4	us-gaap	Accrued Bonuses Current AccruedBonusesCurrent	3747000	USD
CY2021Q4	us-gaap	Accrued Vacation Current AccruedVacationCurrent	2900000	USD
CY2021	us-gaap	Foreign Currency Transaction Gain Loss Realized ForeignCurrencyTransactionGainLossRealized	-500000	USD
CY2020	us-gaap	Foreign Currency Transaction Gain Loss Realized ForeignCurrencyTransactionGainLossRealized	-1100000	USD
CY2019	us-gaap	Foreign Currency Transaction Gain Loss Realized ForeignCurrencyTransactionGainLossRealized	500000	USD
CY2020Q4	us-gaap	Accrued Vacation Current AccruedVacationCurrent	2328000	USD
CY2021Q4	us-gaap	Derivative Liabilities Current DerivativeLiabilitiesCurrent	661000	USD
CY2020Q4	us-gaap	Derivative Liabilities Current DerivativeLiabilitiesCurrent	1150000	USD
CY2021Q4	us-gaap	Workers Compensation Liability Current WorkersCompensationLiabilityCurrent	366000	USD
CY2020Q4	us-gaap	Workers Compensation Liability Current WorkersCompensationLiabilityCurrent	237000	USD
CY2021Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	16380000	USD
CY2020Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	8977000	USD
CY2021Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	24498000	USD
CY2020Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	16814000	USD
CY2021	us-gaap	Net Income Loss NetIncomeLoss	11523000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	19050000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	27902000	USD
CY2021	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	9854000
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	9788000
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	9741000
CY2021	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	74000
CY2020	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	85000
CY2019	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	38000
CY2021	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	9928000
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	9873000
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	9779000
CY2021	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.17
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.95
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.86
CY2021	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.16
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.93
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.85
CY2020	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	0
CY2021	us-gaap	Concentration Risk Credit Risk ConcentrationRiskCreditRisk	<p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"><b>Concentrations of Credit Risk</b></p> <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"> </p> <p style="font-family: "Times New Roman"; font-size: 10pt; font-variant: normal; text-align: justify; margin: 0pt;">Financial instruments, which potentially subject the Company to concentrations of credit risk, consist principally of trade receivables, foreign currency forward contracts, and deferred compensation plan assets. Trade receivables generally represent a large number of customers, including municipalities, manufacturers, distributors, and contractors, dispersed across a wide geographic base. As of <em style="font: inherit;"> December </em><em style="font: inherit;">31,</em> <em style="font: inherit;">2021,</em> no customer had a balance in excess of <em style="font: inherit;">10%</em> of total accounts receivable, and one SPP customer had a balance in excess of <em style="font: inherit;">10%</em> of total accounts receivable as of <em style="font: inherit;"> December </em><em style="font: inherit;">31,</em> <em style="font: inherit;">2020.</em> Foreign currency forward contracts are with a high quality financial institution. The Company’s deferred compensation plan assets, included in Other assets, are invested in a diversified portfolio of stock and bond mutual funds.</p> <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"> </p>
CY2021	nwpx	Number Of Customers With Receivable Balance In Excess Of Ten Percent Of Receivables NumberOfCustomersWithReceivableBalanceInExcessOfTenPercentOfReceivables	0	pure
CY2020	nwpx	Number Of Customers With Receivable Balance In Excess Of Ten Percent Of Receivables NumberOfCustomersWithReceivableBalanceInExcessOfTenPercentOfReceivables	1	pure
CY2021Q4	us-gaap	Inventory Raw Materials Net Of Reserves InventoryRawMaterialsNetOfReserves	44697000	USD
CY2020Q4	us-gaap	Inventory Raw Materials Net Of Reserves InventoryRawMaterialsNetOfReserves	20631000	USD
CY2021Q4	us-gaap	Inventory Work In Process Net Of Reserves InventoryWorkInProcessNetOfReserves	3018000	USD
CY2020Q4	us-gaap	Goodwill Goodwill	22985000	USD
CY2021Q4	us-gaap	Goodwill Goodwill	53684000	USD
CY2020Q4	us-gaap	Inventory Work In Process Net Of Reserves InventoryWorkInProcessNetOfReserves	1416000	USD
CY2021Q4	us-gaap	Inventory Finished Goods Net Of Reserves InventoryFinishedGoodsNetOfReserves	10096000	USD
CY2020Q4	us-gaap	Inventory Finished Goods Net Of Reserves InventoryFinishedGoodsNetOfReserves	5489000	USD
CY2021Q4	us-gaap	Inventory Supplies Net Of Reserves InventorySuppliesNetOfReserves	1840000	USD
CY2020Q4	us-gaap	Inventory Supplies Net Of Reserves InventorySuppliesNetOfReserves	1641000	USD
CY2021Q4	us-gaap	Inventory Net InventoryNet	59651000	USD
CY2020Q4	us-gaap	Inventory Net InventoryNet	29177000	USD
CY2021Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	218181000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	200704000	USD
CY2021Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	106957000	USD
CY2020Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	96684000	USD
CY2021Q4	nwpx	Property Plant And Equipment Net Excluding Construction In Progress PropertyPlantAndEquipmentNetExcludingConstructionInProgress	111224000	USD
CY2020Q4	nwpx	Property Plant And Equipment Net Excluding Construction In Progress PropertyPlantAndEquipmentNetExcludingConstructionInProgress	104020000	USD
CY2021Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	121266000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	110184000	USD
CY2021Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	43963000	USD
CY2021Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	4587000	USD
CY2021Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	39376000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	12963000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	2445000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	10518000	USD
CY2021Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	4436000	USD
CY2021Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	4173000	USD
CY2021Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	4017000	USD
CY2021Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	4017000	USD
CY2021Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	4017000	USD
CY2021Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense After Year Five FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive	18716000	USD
CY2021Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	39376000	USD
CY2021	nwpx	Interest Expense Debt And Finance Leases Net Of Amounts Capitalized InterestExpenseDebtAndFinanceLeasesNetOfAmountsCapitalized	1200000	USD
CY2021	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	100000	USD
CY2020	nwpx	Interest Expense Debt And Finance Leases Net Of Amounts Capitalized InterestExpenseDebtAndFinanceLeasesNetOfAmountsCapitalized	900000	USD
CY2020	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	100000	USD
CY2019	nwpx	Interest Expense Debt And Finance Leases Net Of Amounts Capitalized InterestExpenseDebtAndFinanceLeasesNetOfAmountsCapitalized	500000	USD
CY2021Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	98507000	USD
CY2020Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	30813000	USD
CY2021Q4	nwpx	Lease Right Of Use Asset LeaseRightOfUseAsset	100237000	USD
CY2020Q4	nwpx	Lease Right Of Use Asset LeaseRightOfUseAsset	32101000	USD
CY2021Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	2169000	USD
CY2020Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	1729000	USD
CY2021Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	98429000	USD
CY2020Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	30115000	USD
CY2021Q4	nwpx	Lease Liability LeaseLiability	100598000	USD
CY2020Q4	nwpx	Lease Liability LeaseLiability	31844000	USD
CY2021Q4	us-gaap	Finance Lease Right Of Use Asset Accumulated Amortization FinanceLeaseRightOfUseAssetAccumulatedAmortization	1100000	USD
CY2020Q4	us-gaap	Finance Lease Right Of Use Asset Accumulated Amortization FinanceLeaseRightOfUseAssetAccumulatedAmortization	1300000	USD
CY2021	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	413000	USD
CY2020	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	422000	USD
CY2019	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	435000	USD
CY2021	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	90000	USD
CY2020	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	79000	USD
CY2019	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	57000	USD
CY2021	us-gaap	Operating Lease Cost OperatingLeaseCost	4627000	USD
CY2020	us-gaap	Operating Lease Cost OperatingLeaseCost	3647000	USD
CY2019	us-gaap	Operating Lease Cost OperatingLeaseCost	1934000	USD
CY2021	us-gaap	Short Term Lease Cost ShortTermLeaseCost	993000	USD
CY2020	us-gaap	Short Term Lease Cost ShortTermLeaseCost	745000	USD
CY2019	us-gaap	Short Term Lease Cost ShortTermLeaseCost	1442000	USD
CY2021	us-gaap	Variable Lease Cost VariableLeaseCost	158000	USD
CY2020	us-gaap	Variable Lease Cost VariableLeaseCost	199000	USD
CY2019	us-gaap	Variable Lease Cost VariableLeaseCost	141000	USD
CY2021	us-gaap	Lease Cost LeaseCost	6281000	USD
CY2020	us-gaap	Lease Cost LeaseCost	5092000	USD
CY2019	us-gaap	Lease Cost LeaseCost	4009000	USD
CY2021Q4	us-gaap	Finance Lease Liability Payments Due Next Twelve Months FinanceLeaseLiabilityPaymentsDueNextTwelveMonths	574000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	6802000	USD
CY2021Q4	us-gaap	Finance Lease Liability Payments Due Year Two FinanceLeaseLiabilityPaymentsDueYearTwo	378000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	6669000	USD
CY2021Q4	us-gaap	Finance Lease Liability Payments Due Year Three FinanceLeaseLiabilityPaymentsDueYearThree	692000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	6499000	USD
CY2021Q4	us-gaap	Finance Lease Liability Payments Due Year Four FinanceLeaseLiabilityPaymentsDueYearFour	449000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	6529000	USD
CY2021Q4	us-gaap	Finance Lease Liability Payments Due Year Five FinanceLeaseLiabilityPaymentsDueYearFive	360000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	6431000	USD
CY2021Q4	us-gaap	Finance Lease Liability Payments Due After Year Five FinanceLeaseLiabilityPaymentsDueAfterYearFive	0	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	88557000	USD
CY2021Q4	us-gaap	Finance Lease Liability Payments Due FinanceLeaseLiabilityPaymentsDue	2453000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	121487000	USD
CY2021Q4	us-gaap	Finance Lease Liability Undiscounted Excess Amount FinanceLeaseLiabilityUndiscountedExcessAmount	284000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	23058000	USD
CY2021Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	2169000	USD
CY2021Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	98429000	USD
CY2021Q4	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	475000	USD
CY2021Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	4704000	USD
CY2021Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	93725000	USD
CY2021Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P3Y6M21D
CY2020Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P3Y8M1D
CY2021Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P18Y5M1D
CY2020Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P18Y2M15D
CY2021Q4	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.0510	pure
CY2020Q4	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.0522	pure
CY2021Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0218	pure
CY2020Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0336	pure
CY2021	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	90000	USD
CY2020	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	79000	USD
CY2019	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	57000	USD
CY2021	us-gaap	Operating Lease Payments OperatingLeasePayments	4142000	USD
CY2020	us-gaap	Operating Lease Payments OperatingLeasePayments	3481000	USD
CY2019	us-gaap	Operating Lease Payments OperatingLeasePayments	1909000	USD
CY2021	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	415000	USD
CY2020	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	420000	USD
CY2019	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	434000	USD
CY2021	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	853000	USD
CY2020	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	507000	USD
CY2019	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	819000	USD
CY2021	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	16043000	USD
CY2020	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	4471000	USD
CY2019	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	1335000	USD
CY2021Q4	us-gaap	Deferred Compensation Plan Assets DeferredCompensationPlanAssets	4321000	USD
CY2021Q4	us-gaap	Derivative Assets DerivativeAssets	17000	USD
CY2021Q4	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	4338000	USD
CY2021Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	661000	USD
CY2020Q4	us-gaap	Deferred Compensation Plan Assets DeferredCompensationPlanAssets	4717000	USD
CY2020Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	1150	USD
CY2021	nwpx	Retirement Plan Expense RetirementPlanExpense	1800000	USD
CY2020	nwpx	Retirement Plan Expense RetirementPlanExpense	1600000	USD
CY2019	nwpx	Retirement Plan Expense RetirementPlanExpense	1200000	USD
CY2021	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	3216000	USD
CY2020	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	3088000	USD
CY2019	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	1709000	USD
CY2021Q4	us-gaap	Common Stock Capital Shares Reserved For Future Issuance CommonStockCapitalSharesReservedForFutureIssuance	222022
CY2021Q4	nwpx	Common Stock Capital Shares Reserved For Future Issuance Percentage Vesting Of Outstanding Ps As Assumed CommonStockCapitalSharesReservedForFutureIssuancePercentageVestingOfOutstandingPSAsAssumed	1	pure
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod	0
CY2020	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	24000
CY2020	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	24.15
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	100000	USD
CY2019	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	0
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	0
CY2021Q4	nwpx	Other Commitment Amount Paid For Equipment Purchased Yet Not Received OtherCommitmentAmountPaidForEquipmentPurchasedYetNotReceived	10000000	USD
CY2021Q4	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	1600000	USD
CY2021	nwpx	Increase Decrease In Revenue From Contract With Customers Including Assessed Tax IncreaseDecreaseInRevenueFromContractWithCustomersIncludingAssessedTax	2000000.0	USD
CY2020	nwpx	Increase Decrease In Revenue From Contract With Customers Including Assessed Tax IncreaseDecreaseInRevenueFromContractWithCustomersIncludingAssessedTax	2200000	USD
CY2019	nwpx	Increase Decrease In Revenue From Contract With Customers Including Assessed Tax IncreaseDecreaseInRevenueFromContractWithCustomersIncludingAssessedTax	-1200000	USD
CY2021	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	333313000	USD
CY2020	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	285907000	USD
CY2019	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	279317000	USD
CY2021	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	333313000	USD
CY2020	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	285907000	USD
CY2019	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	279317000	USD
CY2021	us-gaap	Contract With Customer Liability Revenue Recognized ContractWithCustomerLiabilityRevenueRecognized	6200000	USD
CY2020	us-gaap	Contract With Customer Liability Revenue Recognized ContractWithCustomerLiabilityRevenueRecognized	12300000	USD
CY2019	us-gaap	Contract With Customer Liability Revenue Recognized ContractWithCustomerLiabilityRevenueRecognized	3700000	USD
CY2021Q4	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	183000000	USD
CY2021Q4	us-gaap	Revenue Remaining Performance Obligation Percentage RevenueRemainingPerformanceObligationPercentage	0.82	pure
CY2021Q4	us-gaap	Revenue Remaining Performance Obligation Percentage RevenueRemainingPerformanceObligationPercentage	0.18	pure
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	14000000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	24768000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	32244000	USD
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	1158000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	866000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	396000	USD
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	15158000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	25634000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	32640000	USD
CY2021	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	2256000	USD
CY2020	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	958000	USD
CY2019	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	174000	USD
CY2021	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	1064000	USD
CY2020	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	1342000	USD
CY2019	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	-16000	USD
CY2021	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	213000	USD
CY2020	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	243000	USD
CY2019	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	439000	USD
CY2021	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	3533000	USD
CY2020	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	2543000	USD
CY2019	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	597000	USD
CY2021	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	573000	USD
CY2020	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	4380000	USD
CY2019	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	3597000	USD
CY2021	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-464000	USD
CY2020	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-386000	USD
CY2019	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	561000	USD
CY2021	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-7000	USD
CY2020	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	47000	USD
CY2019	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-17000	USD
CY2021	nwpx	Deferred Federal State And Local And Foreign Income Tax Expense Benefit DeferredFederalStateAndLocalAndForeignIncomeTaxExpenseBenefit	102000	USD
CY2020	nwpx	Deferred Federal State And Local And Foreign Income Tax Expense Benefit DeferredFederalStateAndLocalAndForeignIncomeTaxExpenseBenefit	4041000	USD
CY2019	nwpx	Deferred Federal State And Local And Foreign Income Tax Expense Benefit DeferredFederalStateAndLocalAndForeignIncomeTaxExpenseBenefit	4141000	USD
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	3635000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	6584000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	4738000	USD
CY2021	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	3183000	USD
CY2020	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	5383000	USD
CY2019	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	6854000	USD
CY2021	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	547000	USD
CY2020	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	953000	USD
CY2019	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	1261000	USD
CY2021	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	-247000	USD
CY2020	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	-181000	USD
CY2019	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	-3564000	USD
CY2021	us-gaap	Income Tax Reconciliation Nondeductible Expense IncomeTaxReconciliationNondeductibleExpense	-31000	USD
CY2020	us-gaap	Income Tax Reconciliation Nondeductible Expense IncomeTaxReconciliationNondeductibleExpense	447000	USD
CY2019	us-gaap	Income Tax Reconciliation Nondeductible Expense IncomeTaxReconciliationNondeductibleExpense	-24000	USD
CY2021	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	104000	USD
CY2020	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	78000	USD
CY2019	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	36000	USD
CY2021	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	79000	USD
CY2020	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-96000	USD
CY2019	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	175000	USD
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	3635000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	6584000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	4738000	USD
CY2021	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.240	pure
CY2020	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.257	pure
CY2019	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.145	pure
CY2021Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits	3125000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits	3525000	USD
CY2021Q4	us-gaap	Deferred Tax Assets Inventory DeferredTaxAssetsInventory	30000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Inventory DeferredTaxAssetsInventory	73000	USD
CY2021Q4	nwpx	Deferred Tax Asset Trade Receivable Net DeferredTaxAssetTradeReceivableNet	833000	USD
CY2020Q4	nwpx	Deferred Tax Asset Trade Receivable Net DeferredTaxAssetTradeReceivableNet	958000	USD
CY2021Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	3099000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	3231000	USD
CY2021Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	2888000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	2699000	USD
CY2021Q4	nwpx	Deferred Tax Asset Contract Assets Net DeferredTaxAssetContractAssetsNet	313000	USD
CY2020Q4	nwpx	Deferred Tax Asset Contract Assets Net DeferredTaxAssetContractAssetsNet	0	USD
CY2021Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	984000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	389000	USD
CY2021Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	11272000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	10875000	USD
CY2021Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	5899000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	6228000	USD
CY2021Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	5373000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	4647000	USD
CY2021Q4	nwpx	Deferred Tax Liabilities Contract Assets Net DeferredTaxLiabilitiesContractAssetsNet	-0	USD
CY2020Q4	nwpx	Deferred Tax Liabilities Contract Assets Net DeferredTaxLiabilitiesContractAssetsNet	1366000	USD
CY2021Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	12937000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	12029000	USD
CY2021Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	1902000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	2737000	USD
CY2021Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Goodwill DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsGoodwill	129000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Goodwill DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsGoodwill	-0	USD
CY2021Q4	us-gaap	Deferred Tax Liabilities Prepaid Expenses DeferredTaxLiabilitiesPrepaidExpenses	1005000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Prepaid Expenses DeferredTaxLiabilitiesPrepaidExpenses	889000	USD
CY2021Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	15973000	USD
CY2020Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	17021000	USD
CY2021Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	10600000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	12374000	USD
CY2021Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	10984000	USD
CY2020Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	12481000	USD
CY2021Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	10600000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	12374000	USD
CY2020Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	4350000	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	4350000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	4350000	USD
CY2021	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	16000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	0	USD
CY2019	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	0	USD
CY2021Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	4366000	USD
CY2020Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	4350000	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	4350000	USD
CY2021Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAccrued	0	USD
CY2017	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35	pure
CY2021	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.21	pure
CY2019Q1	us-gaap	Tax Cuts And Jobs Act Of2017 Reclassification From Aoci To Retained Earnings Tax Effect TaxCutsAndJobsActOf2017ReclassificationFromAociToRetainedEarningsTaxEffect	200000	USD
CY2021Q4	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	1487000	USD
CY2020Q4	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	1795000	USD
CY2021Q4	us-gaap	Aoci Loss Cash Flow Hedge Cumulative Gain Loss After Tax AociLossCashFlowHedgeCumulativeGainLossAfterTax	-195000	USD
CY2020Q4	us-gaap	Aoci Loss Cash Flow Hedge Cumulative Gain Loss After Tax AociLossCashFlowHedgeCumulativeGainLossAfterTax	-71000	USD
CY2021Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-1682000	USD
CY2020Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-1866000	USD
CY2021	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	333313000	USD
CY2020	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	285907000	USD
CY2019	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	279317000	USD
CY2021	us-gaap	Gross Profit GrossProfit	44254000	USD
CY2020	us-gaap	Gross Profit GrossProfit	50519000	USD
CY2019	us-gaap	Gross Profit GrossProfit	47184000	USD
CY2021	us-gaap	Depreciation And Amortization DepreciationAndAmortization	13624000	USD
CY2020	us-gaap	Depreciation And Amortization DepreciationAndAmortization	14551000	USD
CY2019	us-gaap	Depreciation And Amortization DepreciationAndAmortization	12713000	USD
CY2021	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	13262000	USD
CY2020	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	14013000	USD
CY2019	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	8585000	USD
CY2021Q4	us-gaap	Assets Assets	547679000	USD
CY2020Q4	us-gaap	Assets Assets	373015000	USD
CY2021Q1	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	72311000	USD
CY2021Q2	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	73812000	USD
CY2021Q3	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	84643000	USD
CY2021Q4	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	102547000	USD
CY2021	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	333313000	USD
CY2021Q1	us-gaap	Gross Profit GrossProfit	8775000	USD
CY2021Q2	us-gaap	Gross Profit GrossProfit	9538000	USD
CY2021Q3	us-gaap	Gross Profit GrossProfit	12363000	USD
CY2021Q4	us-gaap	Gross Profit GrossProfit	13578000	USD
CY2021	us-gaap	Gross Profit GrossProfit	44254000	USD
CY2021Q1	us-gaap	Net Income Loss NetIncomeLoss	2175000	USD
CY2021Q2	us-gaap	Net Income Loss NetIncomeLoss	2131000	USD
CY2021Q3	us-gaap	Net Income Loss NetIncomeLoss	4946000	USD
CY2021Q4	us-gaap	Net Income Loss NetIncomeLoss	2271000	USD
CY2021	us-gaap	Net Income Loss NetIncomeLoss	11523000	USD
CY2021Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.22
CY2021Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.22
CY2021Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.50
CY2021Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.23
CY2021	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.17
CY2021Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.22
CY2021Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.21
CY2020Q4	us-gaap	Net Income Loss NetIncomeLoss	5221000	USD
CY2020Q4	us-gaap	Gross Profit GrossProfit	12363000	USD
CY2020	us-gaap	Gross Profit GrossProfit	50519000	USD
CY2020Q1	us-gaap	Net Income Loss NetIncomeLoss	564000	USD
CY2020Q2	us-gaap	Net Income Loss NetIncomeLoss	5998000	USD
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	7267000	USD
CY2021Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.50
CY2021Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.23
CY2021	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.16
CY2020Q1	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	68923000	USD
CY2020Q2	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	69971000	USD
CY2020Q3	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	77632000	USD
CY2020Q4	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	69381000	USD
CY2020	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	285907000	USD
CY2020Q1	us-gaap	Gross Profit GrossProfit	9579000	USD
CY2020Q2	us-gaap	Gross Profit GrossProfit	12958000	USD
CY2020Q3	us-gaap	Gross Profit GrossProfit	15619000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	19050000	USD
CY2020Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.06
CY2020Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.61
CY2020Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.74
CY2020Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.54
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.95
CY2020Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.06
CY2020Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.61
CY2020Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.73
CY2020Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.53
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.93

Files In Submission

Name	View Source	Status
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0001437749-22-006431-index.html	Edgar Link	pending
0001437749-22-006431.txt	Edgar Link	pending
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nwpx-20211231.xsd	Edgar Link	pending
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$NWPX
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2021 Q4 Form 10-K Financial Statement

#000143774922006431 Filed on March 16, 2022

Income Statement

Balance Sheet

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Facts In Submission

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$NWPX NORTHWEST PIPE CO Stock $nwpx

2021 Q4 Form 10-K Financial Statement

#000143774922006431 Filed on March 16, 2022

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$NWPX
NORTHWEST PIPE CO Stock $nwpx