XML 65 R51.htm IDEA: XBRL DOCUMENT v3.24.0.1

Note 2 - Business Combinations - Intangible Assets Acquired (Details) - Park Environmental Equipment, LLC [Member] $ in Millions	Oct. 05, 2021 USD ($)
Intangible Asset Acquired, Useful Life (Year)	10 years 4 months 24 days
Intangible Asset Acquired, Fair Value	$ 31.0
Customer Relationships [Member]
Intangible Asset Acquired, Useful Life (Year)	10 years
Intangible Asset Acquired, Fair Value	$ 19.8
Trademarks and Trade Names [Member]
Intangible Asset Acquired, Useful Life (Year)	10 years
Intangible Asset Acquired, Fair Value	$ 9.6
Patents [Member]
Intangible Asset Acquired, Useful Life (Year)	21 years
Intangible Asset Acquired, Fair Value	$ 1.3
Backlog [Member]
Intangible Asset Acquired, Useful Life (Year)	7 months 6 days
Intangible Asset Acquired, Fair Value	$ 0.3

X

- Definition

Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 350
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)(3)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482665/350-30-50-1

+ Details

Name:	us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 350
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482665/350-30-50-1

+ Details

Name:	us-gaap_FinitelivedIntangibleAssetsAcquired1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=nwpx_ParkEnvironmentalEquipmentLlcMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_CustomerRelationshipsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_TrademarksAndTradeNamesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_PatentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=nwpx_BacklogMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: