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Note 4 - Derivative Instruments and Hedging Activities (Details Textual) $ in Thousands, € in Millions, $ in Millions	Apr. 03, 2023 USD ($)	Mar. 31, 2023 USD ($)	Mar. 31, 2023 CAD ($)	Mar. 31, 2023 EUR (€)	Dec. 31, 2022 USD ($)	Dec. 31, 2022 CAD ($)	Dec. 31, 2022 EUR (€)
Foreign Currency Cash Flow Hedge Gain (Loss)		$ 800
Reclassified to Net Sales [Member]
Foreign Currency Cash Flow Hedge Gain (Loss)		200
Reclassified to Property and Equipment [Member]
Foreign Currency Cash Flow Hedge Gain (Loss)		0
Reclassified to Interest Expense [Member]
Foreign Currency Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months		600
Interest Rate Swap [Member]
Derivative, Notional Amount		$ 21,700			$ 26,700
Derivative, Fixed Interest Rate		1.941%	1.941%	1.941%	1.941%	1.941%	1.941%
Interest Rate Swap [Member] | Forecast [Member]
Derivative, Notional Amount	$ 15,000
Derivative, Fixed Interest Rate	2.96%
Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member]
Derivative, Notional Amount		$ 14,400	$ 19.5		$ 17,100	$ 23.2
Designated as Hedging Instrument [Member] | Foreign Exchange Forward 1 [Member]
Derivative, Notional Amount		1,100		€ 1.1	1,100		€ 1.1
Not Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member]
Derivative, Notional Amount		$ 300	$ 0.4		$ 300	$ 0.4

X

- Definition

Represents gain (loss) for foreign currency cash flow hedge.

+ References

No definition available.

+ Details

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Namespace Prefix:	nwpx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Fixed interest rate related to the interest rate derivative.

+ References

No definition available.

+ Details

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X

- Definition

Nominal or face amount used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480434/815-10-50-1B

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1A
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480434/815-10-50-1A

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X

- Definition

The estimated net amount of unrealized gains or losses on foreign currency cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 815
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480870/815-30-50-1

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