XML 64 R50.htm IDEA: XBRL DOCUMENT
v3.22.0.1

Note 3 - Business Combinations - Intangible Assets Acquired (Details) - USD ($) $ in Thousands | Oct. 05, 2021 | Jan. 31, 2020
--- | --- | ---
Park Environmental Equipment, LLC [Member] |  |
Intangible Asset Acquired, Useful Life (Year) | 10 years 4 months 24 days |
Park Environmental Equipment, LLC [Member] | Customer Relationships [Member] |  |
Intangible Asset Acquired, Useful Life (Year) | 10 years |
Intangible Asset Acquired, Fair Value | $ 19,800 |
Park Environmental Equipment, LLC [Member] | Trademarks and Trade Names [Member] |  |
Intangible Asset Acquired, Useful Life (Year) | 10 years |
Intangible Asset Acquired, Fair Value | $ 9,600 |
Park Environmental Equipment, LLC [Member] | Patents [Member] |  |
Intangible Asset Acquired, Useful Life (Year) | 21 years |
Intangible Asset Acquired, Fair Value | $ 1,300 |
Park Environmental Equipment, LLC [Member] | Backlog [Member] |  |
Intangible Asset Acquired, Useful Life (Year) | 7 months 6 days |
Intangible Asset Acquired, Fair Value | $ 300 |
Geneva Pipe Company, Inc. [Member] |  |
Intangible Asset Acquired, Useful Life (Year) |  | 9 years 10 months 24 days
Intangible Asset Acquired, Fair Value | $ 31,000 | $ 11,165
Geneva Pipe Company, Inc. [Member] | Customer Relationships [Member] |  |
Intangible Asset Acquired, Useful Life (Year) |  | 11 years
Intangible Asset Acquired, Fair Value |  | $ 8,031
Geneva Pipe Company, Inc. [Member] | Trade Names [Member] |  |
Intangible Asset Acquired, Useful Life (Year) |  | 10 years
Intangible Asset Acquired, Fair Value |  | $ 2,093
Geneva Pipe Company, Inc. [Member] | Backlog [Member] |  |
Intangible Asset Acquired, Useful Life (Year) |  | 10 months 24 days
Intangible Asset Acquired, Fair Value |  | $ 1,041

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 -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + 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: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=nwpx_GenevaPipeCompanyIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_TradeNamesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |