XML 43 R28.htm IDEA: XBRL DOCUMENT
v3.23.2

Commitments and Contingencies (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2023 | Dec. 31, 2022
Commitments and Contingencies (Details) [Line Items] |  |
Additional units purchased | 4,500,000 | 4,500,000
Affiliated unit | 1,010,000 | 1,010,000
Underwriting discount | $ 0.2 | $ 0.2
Additional unit | $ 0.35 | $ 0.35
Deferred underwriting commissions | $ 11.7 | $ 11.7
IPO [Member] |  |
Commitments and Contingencies (Details) [Line Items] |  |
Aggregate paid amount | $ 6.7 | $ 6.7

X
- Definition Number of additional Units Purchased. + References No definition available. + Details
Name: | npwr_AdditionalUnitsPurchased
Namespace Prefix: | npwr_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Total units issued during the year due to the affiliated units. All partners include general, limited and preferred partners. + References No definition available. + Details
Name: | npwr_AffiliatedUnits
Namespace Prefix: | npwr_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Aggregate paid amount. + References No definition available. + Details
Name: | npwr_AggregatePaidAmount
Namespace Prefix: | npwr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | npwr_CommitmentsandContingenciesDetailsLineItems
Namespace Prefix: | npwr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Underwriting discount per unit. + References No definition available. + Details
Name: | npwr_UnderwritingDiscount
Namespace Prefix: | npwr_
Data Type: | dtr:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Costs incurred during the period, such as those relating to general administration and policy maintenance that do not vary with and are not primarily related to the acquisition or renewal of insurance contracts. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(7)(b)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483586/944-220-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 944 -SubTopic 720 -Section 25 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479448/944-720-25-2 + Details
Name: | us-gaap_OtherUnderwritingExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Price of a single share of a number of saleable stocks of a company. + References No definition available. + Details
Name: | us-gaap_SharePrice
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_SubsidiarySaleOfStockAxis=us-gaap_IPOMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |