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Note 8 - Revenue - Contract With Customer Assets and Liabilities (Details) - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2025 | Jun. 30, 2024
Balance, Contract Assets | $ 103,422 | $ 120,516
Balance, Contract Liability | (11,197) | (21,450)
Balance, Net Contract Assets | 92,225 | 99,066
Revenue recognized, Contract Assets | 133,903 | 156,976
Revenue recognized, Contract Liability | 29,131 | 12,554
Revenue recognized, Net Contract Assets | 163,034 | 169,530
Contract With Customer, Asset, Billings | (133,871) | (139,827)
Contract With Customer, Liability, Billings | (23,010) | (28,214)
Billings, Net Contract Assets | (156,881) | (168,041)
Contract With Customer, Asset, Other | (578) | 1,816
Contract With Customer, Liability, Other | 858 | 5
Other, Net Contract Assets | 280 | 1,821
Balance, Contract Assets | 102,876 | 139,481
Balance, Contract Liability | (4,218) | (37,105)
Balance, Net Contract Assets | $ 98,658 | $ 102,376

X
- Definition Represents billings portion of the contract with customer, asset. + References No definition available. + Details
Name: | nwpx_ContractWithCustomerAssetBillings
Namespace Prefix: | nwpx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the other portion of contract with customer, asset. + References No definition available. + Details
Name: | nwpx_ContractWithCustomerAssetOther
Namespace Prefix: | nwpx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the revenue recognized in contract with customer, asset. + References No definition available. + Details
Name: | nwpx_ContractWithCustomerAssetRevenueRecognized
Namespace Prefix: | nwpx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the billings portion of the contract with customer liability. + References No definition available. + Details
Name: | nwpx_ContractWithCustomerLiabilityBillings
Namespace Prefix: | nwpx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the other portion of contract with customer, liabilities. + References No definition available. + Details
Name: | nwpx_ContractWithCustomerLiabiltiesOther
Namespace Prefix: | nwpx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the revenue recognized for the net contract assets. + References No definition available. + Details
Name: | nwpx_ContractWithCustomerNetContractAssetRevenueRecognized
Namespace Prefix: | nwpx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The net amount of contract with customer, assets after the reduction of contract liabilties. + References No definition available. + Details
Name: | nwpx_ContractWithCustomerNetContractAssets
Namespace Prefix: | nwpx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The net contract assets from the contract with customer. + References No definition available. + Details
Name: | nwpx_ContractWithCustomerNetContractAssetsBillings
Namespace Prefix: | nwpx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the other portion of contract with customer net contract asset. + References No definition available. + Details
Name: | nwpx_ContractWithCustomerNetContractAssetsOther
Namespace Prefix: | nwpx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due. + References No definition available. + Details
Name: | nwpx_ContractWithCustomersLiabilityRevenueRecognized
Namespace Prefix: | nwpx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-11 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479837/606-10-45-3 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479837/606-10-45-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-8 + Details
Name: | us-gaap_ContractWithCustomerAssetNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-11 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479837/606-10-45-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-8 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479837/606-10-45-2 + Details
Name: | us-gaap_ContractWithCustomerLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant