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v3.23.3

Note 3 - Class A Convertible Preferred Units and Warrants - Warrants Activity (Details) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2023 USD ($) shares
Balance (in shares) | shares | 3,002,500
Balance | $ | $ 47,964
Warrant settlement (in shares) | shares | (812,500)
Warrant settlement | $ | $ (15,121)
Balance (in shares) | shares | 2,190,000
Balance | $ | $ 32,843

X
- Definition Amount of settlement of warrant and rights outstanding. + References No definition available. + Details
Name: | nrp_WarrantsAndRightsOutstandingSettlement
Namespace Prefix: | nrp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of warrants exercised in period + References No definition available. + Details
Name: | nrp_WarrantsExercisedInPeriod
Namespace Prefix: | nrp_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of warrants or rights outstanding. + References No definition available. + Details
Name: | us-gaap_ClassOfWarrantOrRightOutstanding
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Value of outstanding derivative securities that permit the holder the right to purchase securities (usually equity) from the issuer at a specified price. + References No definition available. + Details
Name: | us-gaap_WarrantsAndRightsOutstanding
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant