<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.26.1</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>149</ContextCount>
  <ElementCount>217</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>true</FootnotesReported>
  <SegmentCount>58</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>4</UnitCount>
  <MyReports>
    <Report instance="nrp20260331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>000 - Document - Document And Entity Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://nrplp.com/20260331/role/statement-document-and-entity-information</Role>
      <ShortName>Document And Entity Information</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="nrp20260331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>001 - Statement - Consolidated Balance Sheets (Current Period Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://nrplp.com/20260331/role/statement-consolidated-balance-sheets-current-period-unaudited</Role>
      <ShortName>Consolidated Balance Sheets (Current Period Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="nrp20260331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>002 - Statement - Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://nrplp.com/20260331/role/statement-consolidated-balance-sheets-current-period-unaudited-parentheticals</Role>
      <ShortName>Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="nrp20260331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>003 - Statement - Consolidated Statements of Comprehensive Income (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://nrplp.com/20260331/role/statement-consolidated-statements-of-comprehensive-income-unaudited</Role>
      <ShortName>Consolidated Statements of Comprehensive Income (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="nrp20260331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>004 - Statement - Consolidated Statements of Partners' Capital (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://nrplp.com/20260331/role/statement-consolidated-statements-of-partners-capital-unaudited</Role>
      <ShortName>Consolidated Statements of Partners' Capital (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="nrp20260331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>005 - Statement - Consolidated Statements of Cash Flows (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://nrplp.com/20260331/role/statement-consolidated-statements-of-cash-flows-unaudited</Role>
      <ShortName>Consolidated Statements of Cash Flows (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="nrp20260331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>006 - Disclosure - Note 1 - Basis of Presentation</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://nrplp.com/20260331/role/statement-note-1-basis-of-presentation</Role>
      <ShortName>Note 1 - Basis of Presentation</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="nrp20260331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>007 - Disclosure - Note 2 - Revenues from Contracts with Customers</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://nrplp.com/20260331/role/statement-note-2-revenues-from-contracts-with-customers</Role>
      <ShortName>Note 2 - Revenues from Contracts with Customers</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="nrp20260331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>008 - Disclosure - Note 3 - Common Unit Distributions</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://nrplp.com/20260331/role/statement-note-3-common-unit-distributions</Role>
      <ShortName>Note 3 - Common Unit Distributions</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="nrp20260331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>009 - Disclosure - Note 4 - Net Income Per Common Unit</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://nrplp.com/20260331/role/statement-note-4-net-income-per-common-unit</Role>
      <ShortName>Note 4 - Net Income Per Common Unit</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="nrp20260331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>010 - Disclosure - Note 5 - Segment Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://nrplp.com/20260331/role/statement-note-5-segment-information</Role>
      <ShortName>Note 5 - Segment Information</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="nrp20260331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>011 - Disclosure - Note 6 - Equity Investment</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://nrplp.com/20260331/role/statement-note-6-equity-investment-</Role>
      <ShortName>Note 6 - Equity Investment</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="nrp20260331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>012 - Disclosure - Note 7 - Mineral Rights, Net</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://nrplp.com/20260331/role/statement-note-7-mineral-rights-net</Role>
      <ShortName>Note 7 - Mineral Rights, Net</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="nrp20260331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>013 - Disclosure - Note 8 - Debt, Net</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://nrplp.com/20260331/role/statement-note-8-debt-net</Role>
      <ShortName>Note 8 - Debt, Net</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="nrp20260331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>014 - Disclosure - Note 9 - Fair Value Measurements</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://nrplp.com/20260331/role/statement-note-9-fair-value-measurements-</Role>
      <ShortName>Note 9 - Fair Value Measurements</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="nrp20260331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>015 - Disclosure - Note 10 - Related Party Transactions</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://nrplp.com/20260331/role/statement-note-10-related-party-transactions</Role>
      <ShortName>Note 10 - Related Party Transactions</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="nrp20260331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>016 - Disclosure - Note 11 - Major Customers</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://nrplp.com/20260331/role/statement-note-11-major-customers</Role>
      <ShortName>Note 11 - Major Customers</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="nrp20260331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>017 - Disclosure - Note 12 - Commitments and Contingencies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://nrplp.com/20260331/role/statement-note-12-commitments-and-contingencies</Role>
      <ShortName>Note 12 - Commitments and Contingencies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="nrp20260331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>018 - Disclosure - Note 13 - Unit-Based Compensation</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://nrplp.com/20260331/role/statement-note-13-unitbased-compensation</Role>
      <ShortName>Note 13 - Unit-Based Compensation</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="nrp20260331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>019 - Disclosure - Note 14 - Credit Losses</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://nrplp.com/20260331/role/statement-note-14-credit-losses</Role>
      <ShortName>Note 14 - Credit Losses</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="nrp20260331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>020 - Disclosure - Note 15 - Subsequent Events</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://nrplp.com/20260331/role/statement-note-15-subsequent-events</Role>
      <ShortName>Note 15 - Subsequent Events</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="nrp20260331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>995445 - Disclosure - Insider Trading Arrangements</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/ecd/role/InsiderTradingArrangements</Role>
      <ShortName>Insider Trading Arrangements</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>22</Position>
    </Report>
    <Report instance="nrp20260331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>995467 - Disclosure - Note 2 - Revenues from Contracts with Customers (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://nrplp.com/20260331/role/statement-note-2-revenues-from-contracts-with-customers-tables</Role>
      <ShortName>Note 2 - Revenues from Contracts with Customers (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://nrplp.com/20260331/role/statement-note-2-revenues-from-contracts-with-customers</ParentRole>
      <Position>23</Position>
    </Report>
    <Report instance="nrp20260331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>995468 - Disclosure - Note 3 - Common Unit Distributions (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://nrplp.com/20260331/role/statement-note-3-common-unit-distributions-tables</Role>
      <ShortName>Note 3 - Common Unit Distributions (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://nrplp.com/20260331/role/statement-note-3-common-unit-distributions</ParentRole>
      <Position>24</Position>
    </Report>
    <Report instance="nrp20260331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>995469 - Disclosure - Note 4 - Net Income Per Common Unit (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://nrplp.com/20260331/role/statement-note-4-net-income-per-common-unit-tables</Role>
      <ShortName>Note 4 - Net Income Per Common Unit (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://nrplp.com/20260331/role/statement-note-4-net-income-per-common-unit</ParentRole>
      <Position>25</Position>
    </Report>
    <Report instance="nrp20260331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>995470 - Disclosure - Note 5 - Segment Information (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://nrplp.com/20260331/role/statement-note-5-segment-information-tables</Role>
      <ShortName>Note 5 - Segment Information (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://nrplp.com/20260331/role/statement-note-5-segment-information</ParentRole>
      <Position>26</Position>
    </Report>
    <Report instance="nrp20260331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>995471 - Disclosure - Note 6 - Equity Investment (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://nrplp.com/20260331/role/statement-note-6-equity-investment-tables</Role>
      <ShortName>Note 6 - Equity Investment (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://nrplp.com/20260331/role/statement-note-6-equity-investment-</ParentRole>
      <Position>27</Position>
    </Report>
    <Report instance="nrp20260331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>995472 - Disclosure - Note 7 - Mineral Rights, Net (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://nrplp.com/20260331/role/statement-note-7-mineral-rights-net-tables</Role>
      <ShortName>Note 7 - Mineral Rights, Net (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://nrplp.com/20260331/role/statement-note-7-mineral-rights-net</ParentRole>
      <Position>28</Position>
    </Report>
    <Report instance="nrp20260331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>995473 - Disclosure - Note 8 - Debt, Net (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://nrplp.com/20260331/role/statement-note-8-debt-net-tables</Role>
      <ShortName>Note 8 - Debt, Net (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://nrplp.com/20260331/role/statement-note-8-debt-net</ParentRole>
      <Position>29</Position>
    </Report>
    <Report instance="nrp20260331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>995474 - Disclosure - Note 9 - Fair Value Measurements (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://nrplp.com/20260331/role/statement-note-9-fair-value-measurements-tables</Role>
      <ShortName>Note 9 - Fair Value Measurements (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://nrplp.com/20260331/role/statement-note-9-fair-value-measurements-</ParentRole>
      <Position>30</Position>
    </Report>
    <Report instance="nrp20260331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>995475 - Disclosure - Note 10 - Related Party Transactions (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://nrplp.com/20260331/role/statement-note-10-related-party-transactions-tables</Role>
      <ShortName>Note 10 - Related Party Transactions (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://nrplp.com/20260331/role/statement-note-10-related-party-transactions</ParentRole>
      <Position>31</Position>
    </Report>
    <Report instance="nrp20260331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>995476 - Disclosure - Note 11 - Major Customers (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://nrplp.com/20260331/role/statement-note-11-major-customers-tables</Role>
      <ShortName>Note 11 - Major Customers (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://nrplp.com/20260331/role/statement-note-11-major-customers</ParentRole>
      <Position>32</Position>
    </Report>
    <Report instance="nrp20260331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>995477 - Disclosure - Note 13 - Unit-Based Compensation (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://nrplp.com/20260331/role/statement-note-13-unitbased-compensation-tables</Role>
      <ShortName>Note 13 - Unit-Based Compensation (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://nrplp.com/20260331/role/statement-note-13-unitbased-compensation</ParentRole>
      <Position>33</Position>
    </Report>
    <Report instance="nrp20260331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>995478 - Disclosure - Note 14 - Credit Losses (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://nrplp.com/20260331/role/statement-note-14-credit-losses-tables</Role>
      <ShortName>Note 14 - Credit Losses (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://nrplp.com/20260331/role/statement-note-14-credit-losses</ParentRole>
      <Position>34</Position>
    </Report>
    <Report instance="nrp20260331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>995479 - Disclosure - Note 1 - Basis of Presentation (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://nrplp.com/20260331/role/statement-note-1-basis-of-presentation-details-textual</Role>
      <ShortName>Note 1 - Basis of Presentation (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://nrplp.com/20260331/role/statement-note-1-basis-of-presentation</ParentRole>
      <Position>35</Position>
    </Report>
    <Report instance="nrp20260331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>995480 - Disclosure - Note 2 - Revenues from Contracts with Customers - Disaggregation of Revenue (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://nrplp.com/20260331/role/statement-note-2-revenues-from-contracts-with-customers-disaggregation-of-revenue-details</Role>
      <ShortName>Note 2 - Revenues from Contracts with Customers - Disaggregation of Revenue (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>36</Position>
    </Report>
    <Report instance="nrp20260331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>995481 - Disclosure - Note 2 - Revenues from Contracts with Customers - Assets and Liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://nrplp.com/20260331/role/statement-note-2-revenues-from-contracts-with-customers-assets-and-liabilities-details</Role>
      <ShortName>Note 2 - Revenues from Contracts with Customers - Assets and Liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>37</Position>
    </Report>
    <Report instance="nrp20260331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>995482 - Disclosure - Note 2 - Revenues from Contracts with Customers - Operating Lease Payments Receivable (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://nrplp.com/20260331/role/statement-note-2-revenues-from-contracts-with-customers-operating-lease-payments-receivable-details</Role>
      <ShortName>Note 2 - Revenues from Contracts with Customers - Operating Lease Payments Receivable (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>38</Position>
    </Report>
    <Report instance="nrp20260331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>995483 - Disclosure - Note 3 - Common Unit Distributions (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://nrplp.com/20260331/role/statement-note-3-common-unit-distributions-details-textual</Role>
      <ShortName>Note 3 - Common Unit Distributions (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://nrplp.com/20260331/role/statement-note-3-common-unit-distributions-tables</ParentRole>
      <Position>39</Position>
    </Report>
    <Report instance="nrp20260331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>995484 - Disclosure - Note 3 - Common Unit Distributions - Distributions Made to Partners (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://nrplp.com/20260331/role/statement-note-3-common-unit-distributions-distributions-made-to-partners-details</Role>
      <ShortName>Note 3 - Common Unit Distributions - Distributions Made to Partners (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>40</Position>
    </Report>
    <Report instance="nrp20260331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>995485 - Disclosure - Note 4 - Net Income Per Common Unit - Schedule of Earnings Per Share (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://nrplp.com/20260331/role/statement-note-4-net-income-per-common-unit-schedule-of-earnings-per-share-details</Role>
      <ShortName>Note 4 - Net Income Per Common Unit - Schedule of Earnings Per Share (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>41</Position>
    </Report>
    <Report instance="nrp20260331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>995486 - Disclosure - Note 5 - Segment Information (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://nrplp.com/20260331/role/statement-note-5-segment-information-details-textual</Role>
      <ShortName>Note 5 - Segment Information (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://nrplp.com/20260331/role/statement-note-5-segment-information-tables</ParentRole>
      <Position>42</Position>
    </Report>
    <Report instance="nrp20260331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>995487 - Disclosure - Note 5 - Segment Information - Information By Segment (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://nrplp.com/20260331/role/statement-note-5-segment-information-information-by-segment-details</Role>
      <ShortName>Note 5 - Segment Information - Information By Segment (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>43</Position>
    </Report>
    <Report instance="nrp20260331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>995488 - Disclosure - Note 6 - Equity Investment (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://nrplp.com/20260331/role/statement-note-6-equity-investment-details-textual</Role>
      <ShortName>Note 6 - Equity Investment (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://nrplp.com/20260331/role/statement-note-6-equity-investment-tables</ParentRole>
      <Position>44</Position>
    </Report>
    <Report instance="nrp20260331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>995489 - Disclosure - Note 6 - Equity Investment - Investment Activity (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://nrplp.com/20260331/role/statement-note-6-equity-investment-investment-activity-details</Role>
      <ShortName>Note 6 - Equity Investment - Investment Activity (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>45</Position>
    </Report>
    <Report instance="nrp20260331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>995490 - Disclosure - Note 7 - Mineral Rights, Net (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://nrplp.com/20260331/role/statement-note-7-mineral-rights-net-details-textual</Role>
      <ShortName>Note 7 - Mineral Rights, Net (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://nrplp.com/20260331/role/statement-note-7-mineral-rights-net-tables</ParentRole>
      <Position>46</Position>
    </Report>
    <Report instance="nrp20260331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>995491 - Disclosure - Note 7 - Mineral Rights, Net - Composition of Mineral Rights (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://nrplp.com/20260331/role/statement-note-7-mineral-rights-net-composition-of-mineral-rights-details</Role>
      <ShortName>Note 7 - Mineral Rights, Net - Composition of Mineral Rights (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>47</Position>
    </Report>
    <Report instance="nrp20260331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>995492 - Disclosure - Note 8 - Debt, Net (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://nrplp.com/20260331/role/statement-note-8-debt-net-details-textual</Role>
      <ShortName>Note 8 - Debt, Net (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://nrplp.com/20260331/role/statement-note-8-debt-net-tables</ParentRole>
      <Position>48</Position>
    </Report>
    <Report instance="nrp20260331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>995493 - Disclosure - Note 8 - Debt, Net - Schedule of Long-term Debt (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://nrplp.com/20260331/role/statement-note-8-debt-net-schedule-of-longterm-debt-details</Role>
      <ShortName>Note 8 - Debt, Net - Schedule of Long-term Debt (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>49</Position>
    </Report>
    <Report instance="nrp20260331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>995495 - Disclosure - Note 9 - Fair Value Measurements (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://nrplp.com/20260331/role/statement-note-9-fair-value-measurements-details-textual</Role>
      <ShortName>Note 9 - Fair Value Measurements (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://nrplp.com/20260331/role/statement-note-9-fair-value-measurements-tables</ParentRole>
      <Position>50</Position>
    </Report>
    <Report instance="nrp20260331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>995496 - Disclosure - Note 9 - Fair Value Measurements - Fair Value of Financial Assets and Liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://nrplp.com/20260331/role/statement-note-9-fair-value-measurements-fair-value-of-financial-assets-and-liabilities-details</Role>
      <ShortName>Note 9 - Fair Value Measurements - Fair Value of Financial Assets and Liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>51</Position>
    </Report>
    <Report instance="nrp20260331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>995497 - Disclosure - Note 10 - Related Party Transactions (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://nrplp.com/20260331/role/statement-note-10-related-party-transactions-details-textual</Role>
      <ShortName>Note 10 - Related Party Transactions (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://nrplp.com/20260331/role/statement-note-10-related-party-transactions-tables</ParentRole>
      <Position>52</Position>
    </Report>
    <Report instance="nrp20260331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>995498 - Disclosure - Note 10 - Related Party Transactions - General Partner Affiliates (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://nrplp.com/20260331/role/statement-note-10-related-party-transactions-general-partner-affiliates-details</Role>
      <ShortName>Note 10 - Related Party Transactions - General Partner Affiliates (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>53</Position>
    </Report>
    <Report instance="nrp20260331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>995499 - Disclosure - Note 11 - Major Customers - Concentration Risk (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://nrplp.com/20260331/role/statement-note-11-major-customers-concentration-risk-details</Role>
      <ShortName>Note 11 - Major Customers - Concentration Risk (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>54</Position>
    </Report>
    <Report instance="nrp20260331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>995500 - Disclosure - Note 13 - Unit-Based Compensation (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://nrplp.com/20260331/role/statement-note-13-unitbased-compensation-details-textual</Role>
      <ShortName>Note 13 - Unit-Based Compensation (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://nrplp.com/20260331/role/statement-note-13-unitbased-compensation-tables</ParentRole>
      <Position>55</Position>
    </Report>
    <Report instance="nrp20260331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>995501 - Disclosure - Note 13 - Unit-Based Compensation - Share-based Compensation Activity (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://nrplp.com/20260331/role/statement-note-13-unitbased-compensation-sharebased-compensation-activity-details</Role>
      <ShortName>Note 13 - Unit-Based Compensation - Share-based Compensation Activity (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>56</Position>
    </Report>
    <Report instance="nrp20260331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>995502 - Disclosure - Note 14 - Credit Losses (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://nrplp.com/20260331/role/statement-note-14-credit-losses-details-textual</Role>
      <ShortName>Note 14 - Credit Losses (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://nrplp.com/20260331/role/statement-note-14-credit-losses-tables</ParentRole>
      <Position>57</Position>
    </Report>
    <Report instance="nrp20260331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>995503 - Disclosure - Note 14 - Credit Losses - Allowance for Credit Losses (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://nrplp.com/20260331/role/statement-note-14-credit-losses-allowance-for-credit-losses-details</Role>
      <ShortName>Note 14 - Credit Losses - Allowance for Credit Losses (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>58</Position>
    </Report>
    <Report instance="nrp20260331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>995504 - Disclosure - Note 15 - Subsequent Events (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://nrplp.com/20260331/role/statement-note-15-subsequent-events-details-textual</Role>
      <ShortName>Note 15 - Subsequent Events (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://nrplp.com/20260331/role/statement-note-15-subsequent-events</ParentRole>
      <Position>59</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <InputFiles>
    <File>nrp-20260331.xsd</File>
    <File>nrp-20260331_cal.xml</File>
    <File>nrp-20260331_def.xml</File>
    <File>nrp-20260331_lab.xml</File>
    <File>nrp-20260331_pre.xml</File>
    <File doctype="10-Q" isDefinitelyFs="true" isUsgaap="true" original="nrp20260331_10q.htm">nrp20260331_10q.htm</File>
  </InputFiles>
  <SupplementalFiles>
    <File>logo.jpg</File>
  </SupplementalFiles>
  <BaseTaxonomies>
    <BaseTaxonomy items="576">http://fasb.org/us-gaap/2026</BaseTaxonomy>
    <BaseTaxonomy items="29">http://xbrl.sec.gov/dei/2026</BaseTaxonomy>
    <BaseTaxonomy items="5">http://xbrl.sec.gov/ecd/2026</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
