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Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net sales	$ 403,298us-gaap_SalesRevenueNet	$ 359,445us-gaap_SalesRevenueNet	$ 388,902us-gaap_SalesRevenueNet
Cost of sales	362,722us-gaap_CostOfRevenue	299,209us-gaap_CostOfRevenue	329,794us-gaap_CostOfRevenue
Gross profit	40,576us-gaap_GrossProfit	60,236us-gaap_GrossProfit	59,108us-gaap_GrossProfit
Selling, general and administrative expense	24,316us-gaap_SellingGeneralAndAdministrativeExpense	22,701us-gaap_SellingGeneralAndAdministrativeExpense	27,822us-gaap_SellingGeneralAndAdministrativeExpense
Impairment of Tubular Products goodwill	16,066us-gaap_GoodwillImpairmentLoss
Operating income	194us-gaap_OperatingIncomeLoss	37,535us-gaap_OperatingIncomeLoss	31,286us-gaap_OperatingIncomeLoss
Other income (expense)	108us-gaap_OtherNonoperatingIncomeExpense	(289)us-gaap_OtherNonoperatingIncomeExpense	(339)us-gaap_OtherNonoperatingIncomeExpense
Interest income	466us-gaap_OtherInterestAndDividendIncome	409us-gaap_OtherInterestAndDividendIncome	147us-gaap_OtherInterestAndDividendIncome
Interest expense	(2,290)us-gaap_InterestExpense	(3,621)us-gaap_InterestExpense	(5,205)us-gaap_InterestExpense
Income (loss) before income taxes	(1,522)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	34,034us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	25,889us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income tax expense	4,651us-gaap_IncomeTaxExpenseBenefit	12,358us-gaap_IncomeTaxExpenseBenefit	8,388us-gaap_IncomeTaxExpenseBenefit
Income (loss) from continuing operations	(6,173)us-gaap_IncomeLossFromContinuingOperations	21,676us-gaap_IncomeLossFromContinuingOperations	17,501us-gaap_IncomeLossFromContinuingOperations
Discontinued operations:
Loss from operations of discontinued business	(2,151)nwpx_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeTax	(9,583)nwpx_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeTax	(4,124)nwpx_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeTax
Impairment of fixed assets		(27,500)us-gaap_TangibleAssetImpairmentCharges
Loss on sale of business	(13,497)us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax
Income tax benefit	(3,934)us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation	(14,484)us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation	(2,867)us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation
Loss on discontinued operations	(11,714)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax	(22,599)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax	(1,257)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
Net Income (loss)	(17,887)us-gaap_NetIncomeLoss	(923)us-gaap_NetIncomeLoss	16,244us-gaap_NetIncomeLoss
Basic earnings (loss) per share
Continuing operations	$ (0.65)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare	$ 2.29us-gaap_IncomeLossFromContinuingOperationsPerBasicShare	$ 1.87us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
Discontinued operations	$ (1.23)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare	$ (2.39)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare	$ (0.14)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare
Net Income (loss) per share	$ (1.88)us-gaap_EarningsPerShareBasic	$ (0.10)us-gaap_EarningsPerShareBasic	$ 1.73us-gaap_EarningsPerShareBasic
Diluted earnings (loss) per share
Continuing operations	$ (0.65)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare	$ 2.27us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare	$ 1.85us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare
Discontinued operations	$ (1.23)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare	$ (2.37)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare	$ (0.13)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare
Net Income (loss) per share assuming dilution	$ (1.88)us-gaap_EarningsPerShareDiluted	$ (0.10)us-gaap_EarningsPerShareDiluted	$ 1.72us-gaap_EarningsPerShareDiluted
Shares used in per share calculations:
Basic	9,515us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	9,445us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	9,377us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted	9,515us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	9,534us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	9,445us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Tubular Products [Member]
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