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Note 8 - Stockholders' Equity (Details Textual) - USD ($)	Sep. 30, 2022	Sep. 02, 2022	Dec. 31, 2021
Common Stock, Par or Stated Value Per Share (in dollars per share)	$ 0.01	$ 0.01	$ 0.01
At-the-Market Offering [Member]
Equity Offering, Maximum Offering Amount		$ 50,000,000
Equity Offering, Commission, Percentage of Gross Proceeds		3.00%

X

- Definition

Represents the cash commission percentage of gross proceeds

+ References

No definition available.

+ Details

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Namespace Prefix:	nwpx_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Maximum value of company's equity authorized for issuance under equity offering.

+ References

No definition available.

+ Details

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

X

- Definition

Face amount or stated value per share of common stock.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=nwpx_AtthemarketOfferingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: