<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.26.1</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>330</ContextCount>
  <ElementCount>295</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>true</FootnotesReported>
  <SegmentCount>92</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>4</UnitCount>
  <MyReports>
    <Report instance="rvph20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>000 - Document - Document And Entity Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://revivapharma.com/20251231/role/statement-document-and-entity-information</Role>
      <ShortName>Document And Entity Information</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="rvph20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>001 - Statement - Consolidated Balance Sheets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://revivapharma.com/20251231/role/statement-consolidated-balance-sheets</Role>
      <ShortName>Consolidated Balance Sheets</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="rvph20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>002 - Statement - Consolidated Balance Sheets (Parentheticals)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://revivapharma.com/20251231/role/statement-consolidated-balance-sheets-parentheticals</Role>
      <ShortName>Consolidated Balance Sheets (Parentheticals)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="rvph20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>003 - Statement - Consolidated Statements of Operations</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://revivapharma.com/20251231/role/statement-consolidated-statements-of-operations</Role>
      <ShortName>Consolidated Statements of Operations</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="rvph20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>004 - Statement - Consolidated Statement of Stockholders' Equity</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://revivapharma.com/20251231/role/statement-consolidated-statement-of-stockholders-equity</Role>
      <ShortName>Consolidated Statement of Stockholders' Equity</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="rvph20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>005 - Statement - Consolidated Statements of Cash Flows</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://revivapharma.com/20251231/role/statement-consolidated-statements-of-cash-flows</Role>
      <ShortName>Consolidated Statements of Cash Flows</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="rvph20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>995443 - Disclosure - Award Timing Disclosure</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/ecd/role/AwardTimingDisclosure</Role>
      <ShortName>Award Timing Disclosure</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="rvph20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.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>8</Position>
    </Report>
    <Report instance="rvph20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>995447 - Disclosure - Insider Trading Policies and Procedures</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/ecd/role/InsiderTradingPoliciesProc</Role>
      <ShortName>Insider Trading Policies and Procedures</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="rvph20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>995550 - Disclosure - Cybersecurity Risk Management and Strategy Disclosure</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/cyd/role/CybersecurityRiskManagementAndStrategyDisclosure</Role>
      <ShortName>Cybersecurity Risk Management and Strategy Disclosure</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="rvph20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>995550 - Disclosure - Note 1 - Organization and Nature of Operations</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://revivapharma.com/20251231/role/statement-note-1-organization-and-nature-of-operations</Role>
      <ShortName>Note 1 - Organization and Nature of Operations</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="rvph20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>995551 - Disclosure - Note 2 - Summary of Significant Accounting Policies and Basis of Presentation</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://revivapharma.com/20251231/role/statement-note-2-summary-of-significant-accounting-policies-and-basis-of-presentation</Role>
      <ShortName>Note 2 - Summary of Significant Accounting Policies and Basis of Presentation</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="rvph20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>995552 - Disclosure - Note 3 - Net Loss Per Share</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://revivapharma.com/20251231/role/statement-note-3-net-loss-per-share</Role>
      <ShortName>Note 3 - Net Loss Per Share</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="rvph20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>995553 - Disclosure - Note 4 - Warrants</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://revivapharma.com/20251231/role/statement-note-4-warrants-</Role>
      <ShortName>Note 4 - Warrants</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="rvph20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>995554 - Disclosure - Note 5 - Stockholders' Equity, Equity Incentive Plans, And Stock-Based Compensation</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://revivapharma.com/20251231/role/statement-note-5-stockholders-equity-equity-incentive-plans-and-stockbased-compensation</Role>
      <ShortName>Note 5 - Stockholders' Equity, Equity Incentive Plans, And Stock-Based Compensation</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="rvph20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>995555 - Disclosure - Note 6 - Commitments and Contingencies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://revivapharma.com/20251231/role/statement-note-6-commitments-and-contingencies</Role>
      <ShortName>Note 6 - Commitments and Contingencies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="rvph20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>995556 - Disclosure - Note 7 - Fair Value Measurements</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://revivapharma.com/20251231/role/statement-note-7-fair-value-measurements</Role>
      <ShortName>Note 7 - Fair Value Measurements</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="rvph20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>995557 - Disclosure - Note 8 - Income Taxes</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://revivapharma.com/20251231/role/statement-note-8-income-taxes</Role>
      <ShortName>Note 8 - Income Taxes</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="rvph20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>995558 - Disclosure - Note 9 - Segment Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://revivapharma.com/20251231/role/statement-note-9-segment-information</Role>
      <ShortName>Note 9 - Segment Information</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="rvph20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>995559 - Disclosure - Note 10 - Subsequent Events</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://revivapharma.com/20251231/role/statement-note-10-subsequent-events</Role>
      <ShortName>Note 10 - Subsequent Events</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="rvph20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>995560 - Disclosure - Significant Accounting Policies (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://revivapharma.com/20251231/role/statement-significant-accounting-policies-policies</Role>
      <ShortName>Significant Accounting Policies (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <ParentRole>http://revivapharma.com/20251231/role/statement-note-2-summary-of-significant-accounting-policies-and-basis-of-presentation</ParentRole>
      <Position>21</Position>
    </Report>
    <Report instance="rvph20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>995561 - Disclosure - Note 2 - Summary of Significant Accounting Policies and Basis of Presentation (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://revivapharma.com/20251231/role/statement-note-2-summary-of-significant-accounting-policies-and-basis-of-presentation-tables</Role>
      <ShortName>Note 2 - Summary of Significant Accounting Policies and Basis of Presentation (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://revivapharma.com/20251231/role/statement-note-2-summary-of-significant-accounting-policies-and-basis-of-presentation</ParentRole>
      <Position>22</Position>
    </Report>
    <Report instance="rvph20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>995562 - Disclosure - Note 3 - Net Loss Per Share (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://revivapharma.com/20251231/role/statement-note-3-net-loss-per-share-tables</Role>
      <ShortName>Note 3 - Net Loss Per Share (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://revivapharma.com/20251231/role/statement-note-3-net-loss-per-share</ParentRole>
      <Position>23</Position>
    </Report>
    <Report instance="rvph20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>995563 - Disclosure - Note 4 - Warrants (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://revivapharma.com/20251231/role/statement-note-4-warrants-tables</Role>
      <ShortName>Note 4 - Warrants (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://revivapharma.com/20251231/role/statement-note-4-warrants-</ParentRole>
      <Position>24</Position>
    </Report>
    <Report instance="rvph20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>995564 - Disclosure - Note 5 - Stockholders' Equity, Equity Incentive Plans, And Stock-Based Compensation (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://revivapharma.com/20251231/role/statement-note-5-stockholders-equity-equity-incentive-plans-and-stockbased-compensation-tables</Role>
      <ShortName>Note 5 - Stockholders' Equity, Equity Incentive Plans, And Stock-Based Compensation (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://revivapharma.com/20251231/role/statement-note-5-stockholders-equity-equity-incentive-plans-and-stockbased-compensation</ParentRole>
      <Position>25</Position>
    </Report>
    <Report instance="rvph20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>995565 - Disclosure - Note 7 - Fair Value Measurements (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://revivapharma.com/20251231/role/statement-note-7-fair-value-measurements-tables</Role>
      <ShortName>Note 7 - Fair Value Measurements (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://revivapharma.com/20251231/role/statement-note-7-fair-value-measurements</ParentRole>
      <Position>26</Position>
    </Report>
    <Report instance="rvph20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>995566 - Disclosure - Note 8 - Income Taxes (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://revivapharma.com/20251231/role/statement-note-8-income-taxes-tables</Role>
      <ShortName>Note 8 - Income Taxes (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://revivapharma.com/20251231/role/statement-note-8-income-taxes</ParentRole>
      <Position>27</Position>
    </Report>
    <Report instance="rvph20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>995567 - Disclosure - Note 1 - Organization and Nature of Operations (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://revivapharma.com/20251231/role/statement-note-1-organization-and-nature-of-operations-details-textual</Role>
      <ShortName>Note 1 - Organization and Nature of Operations (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://revivapharma.com/20251231/role/statement-note-1-organization-and-nature-of-operations</ParentRole>
      <Position>28</Position>
    </Report>
    <Report instance="rvph20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>995568 - Disclosure - Note 2 - Summary of Significant Accounting Policies and Basis of Presentation (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://revivapharma.com/20251231/role/statement-note-2-summary-of-significant-accounting-policies-and-basis-of-presentation-details-textual</Role>
      <ShortName>Note 2 - Summary of Significant Accounting Policies and Basis of Presentation (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://revivapharma.com/20251231/role/statement-note-2-summary-of-significant-accounting-policies-and-basis-of-presentation-tables</ParentRole>
      <Position>29</Position>
    </Report>
    <Report instance="rvph20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>995569 - Disclosure - Note 2 - Summary of Significant Accounting Policies and Basis of Presentation - Components of Cash and Cash Equivalents (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://revivapharma.com/20251231/role/statement-note-2-summary-of-significant-accounting-policies-and-basis-of-presentation-components-of-cash-and-cash-equivalents-details</Role>
      <ShortName>Note 2 - Summary of Significant Accounting Policies and Basis of Presentation - Components of Cash and Cash Equivalents (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>30</Position>
    </Report>
    <Report instance="rvph20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>995570 - Disclosure - Note 3 - Net Loss Per Share (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://revivapharma.com/20251231/role/statement-note-3-net-loss-per-share-details-textual</Role>
      <ShortName>Note 3 - Net Loss Per Share (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://revivapharma.com/20251231/role/statement-note-3-net-loss-per-share-tables</ParentRole>
      <Position>31</Position>
    </Report>
    <Report instance="rvph20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>995571 - Disclosure - Note 3 - Net Loss Per Share - Schedule of Earnings Per Share (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://revivapharma.com/20251231/role/statement-note-3-net-loss-per-share-schedule-of-earnings-per-share-details</Role>
      <ShortName>Note 3 - Net Loss Per Share - Schedule of Earnings Per Share (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>32</Position>
    </Report>
    <Report instance="rvph20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>995572 - Disclosure - Note 3 - Net Loss Per Share - Antidilutive Securities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://revivapharma.com/20251231/role/statement-note-3-net-loss-per-share-antidilutive-securities-details</Role>
      <ShortName>Note 3 - Net Loss Per Share - Antidilutive Securities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>33</Position>
    </Report>
    <Report instance="rvph20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>995573 - Disclosure - Note 3 - Net Loss Per Share - Antidilutive Securities (Details) (Parentheticals)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://revivapharma.com/20251231/role/statement-note-3-net-loss-per-share-antidilutive-securities-details-parentheticals</Role>
      <ShortName>Note 3 - Net Loss Per Share - Antidilutive Securities (Details) (Parentheticals)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>34</Position>
    </Report>
    <Report instance="rvph20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>995574 - Disclosure - Note 4 - Warrants (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://revivapharma.com/20251231/role/statement-note-4-warrants-details-textual</Role>
      <ShortName>Note 4 - Warrants (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://revivapharma.com/20251231/role/statement-note-4-warrants-tables</ParentRole>
      <Position>35</Position>
    </Report>
    <Report instance="rvph20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>995575 - Disclosure - Note 4 - Warrants - Warrants Outstanding (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://revivapharma.com/20251231/role/statement-note-4-warrants-warrants-outstanding-details</Role>
      <ShortName>Note 4 - Warrants - Warrants Outstanding (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>36</Position>
    </Report>
    <Report instance="rvph20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>995576 - Disclosure - Note 4 - Warrants - Summary of Valuation Assumption (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://revivapharma.com/20251231/role/statement-note-4-warrants-summary-of-valuation-assumption-details</Role>
      <ShortName>Note 4 - Warrants - Summary of Valuation Assumption (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>37</Position>
    </Report>
    <Report instance="rvph20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>995577 - Disclosure - Note 5 - Stockholders' Equity, Equity Incentive Plans, And Stock-Based Compensation (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://revivapharma.com/20251231/role/statement-note-5-stockholders-equity-equity-incentive-plans-and-stockbased-compensation-details-textual</Role>
      <ShortName>Note 5 - Stockholders' Equity, Equity Incentive Plans, And Stock-Based Compensation (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://revivapharma.com/20251231/role/statement-note-5-stockholders-equity-equity-incentive-plans-and-stockbased-compensation-tables</ParentRole>
      <Position>38</Position>
    </Report>
    <Report instance="rvph20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>995578 - Disclosure - Note 5 - Stockholders' Equity, Equity Incentive Plans, And Stock-Based Compensation - Summary of Common Stock Reserved for Future Issuance (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://revivapharma.com/20251231/role/statement-note-5-stockholders-equity-equity-incentive-plans-and-stockbased-compensation-summary-of-common-stock-reserved-for-future-issuance-details</Role>
      <ShortName>Note 5 - Stockholders' Equity, Equity Incentive Plans, And Stock-Based Compensation - Summary of Common Stock Reserved for Future Issuance (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>39</Position>
    </Report>
    <Report instance="rvph20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>995579 - Disclosure - Note 5 - Stockholders' Equity, Equity Incentive Plans, And Stock-Based Compensation - Valuation Assumptions (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://revivapharma.com/20251231/role/statement-note-5-stockholders-equity-equity-incentive-plans-and-stockbased-compensation-valuation-assumptions-details</Role>
      <ShortName>Note 5 - Stockholders' Equity, Equity Incentive Plans, And Stock-Based Compensation - Valuation Assumptions (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>40</Position>
    </Report>
    <Report instance="rvph20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>995580 - Disclosure - Note 5 - Stockholders' Equity, Equity Incentive Plans, And Stock-Based Compensation - Stock Option Activity (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://revivapharma.com/20251231/role/statement-note-5-stockholders-equity-equity-incentive-plans-and-stockbased-compensation-stock-option-activity-details</Role>
      <ShortName>Note 5 - Stockholders' Equity, Equity Incentive Plans, And Stock-Based Compensation - Stock Option Activity (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>41</Position>
    </Report>
    <Report instance="rvph20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>995581 - Disclosure - Note 5 - Stockholders' Equity, Equity Incentive Plans, And Stock-Based Compensation - Stock-based Compensation Expense (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://revivapharma.com/20251231/role/statement-note-5-stockholders-equity-equity-incentive-plans-and-stockbased-compensation-stockbased-compensation-expense-details</Role>
      <ShortName>Note 5 - Stockholders' Equity, Equity Incentive Plans, And Stock-Based Compensation - Stock-based Compensation Expense (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>42</Position>
    </Report>
    <Report instance="rvph20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>995582 - Disclosure - Note 6 - Commitments and Contingencies (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://revivapharma.com/20251231/role/statement-note-6-commitments-and-contingencies-details-textual</Role>
      <ShortName>Note 6 - Commitments and Contingencies (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://revivapharma.com/20251231/role/statement-note-6-commitments-and-contingencies</ParentRole>
      <Position>43</Position>
    </Report>
    <Report instance="rvph20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>995583 - Disclosure - Note 7 - Fair Value Measurements (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://revivapharma.com/20251231/role/statement-note-7-fair-value-measurements-details-textual</Role>
      <ShortName>Note 7 - Fair Value Measurements (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://revivapharma.com/20251231/role/statement-note-7-fair-value-measurements-tables</ParentRole>
      <Position>44</Position>
    </Report>
    <Report instance="rvph20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>995584 - Disclosure - Note 7 - Fair Value Measurements - Fair Value on Recurring Basis (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://revivapharma.com/20251231/role/statement-note-7-fair-value-measurements-fair-value-on-recurring-basis-details</Role>
      <ShortName>Note 7 - Fair Value Measurements - Fair Value on Recurring Basis (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>45</Position>
    </Report>
    <Report instance="rvph20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>995585 - Disclosure - Note 7 - Fair Value Measurements - Fair Value on Recurring Basis Unobservable Input Reconciliation (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://revivapharma.com/20251231/role/statement-note-7-fair-value-measurements-fair-value-on-recurring-basis-unobservable-input-reconciliation-details</Role>
      <ShortName>Note 7 - Fair Value Measurements - Fair Value on Recurring Basis Unobservable Input Reconciliation (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>46</Position>
    </Report>
    <Report instance="rvph20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>995586 - Disclosure - Note 7 - Fair Value Measurements - Fair Value on Recurring Basis Unobservable Input Reconciliation (Details) (Parentheticals)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://revivapharma.com/20251231/role/statement-note-7-fair-value-measurements-fair-value-on-recurring-basis-unobservable-input-reconciliation-details-parentheticals</Role>
      <ShortName>Note 7 - Fair Value Measurements - Fair Value on Recurring Basis Unobservable Input Reconciliation (Details) (Parentheticals)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>47</Position>
    </Report>
    <Report instance="rvph20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>995587 - Disclosure - Note 7 - Fair Value Measurements - Key Inputs (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://revivapharma.com/20251231/role/statement-note-7-fair-value-measurements-key-inputs-details</Role>
      <ShortName>Note 7 - Fair Value Measurements - Key Inputs (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>48</Position>
    </Report>
    <Report instance="rvph20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>995588 - Disclosure - Note 8 - Income Taxes (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://revivapharma.com/20251231/role/statement-note-8-income-taxes-details-textual</Role>
      <ShortName>Note 8 - Income Taxes (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://revivapharma.com/20251231/role/statement-note-8-income-taxes-tables</ParentRole>
      <Position>49</Position>
    </Report>
    <Report instance="rvph20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>995589 - Disclosure - Note 8 - Income Taxes - Domestic and International Pre-tax Income (Loss) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://revivapharma.com/20251231/role/statement-note-8-income-taxes-domestic-and-international-pretax-income-loss-details</Role>
      <ShortName>Note 8 - Income Taxes - Domestic and International Pre-tax Income (Loss) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>50</Position>
    </Report>
    <Report instance="rvph20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>995590 - Disclosure - Note 8 - Income Taxes - Income Tax Expense Attributable to Operations (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://revivapharma.com/20251231/role/statement-note-8-income-taxes-income-tax-expense-attributable-to-operations-details</Role>
      <ShortName>Note 8 - Income Taxes - Income Tax Expense Attributable to Operations (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>51</Position>
    </Report>
    <Report instance="rvph20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>995591 - Disclosure - Note 8 - Income Taxes - Provision for Income Taxes (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://revivapharma.com/20251231/role/statement-note-8-income-taxes-provision-for-income-taxes-details</Role>
      <ShortName>Note 8 - Income Taxes - Provision for Income Taxes (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>52</Position>
    </Report>
    <Report instance="rvph20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>995592 - Disclosure - Note 8 - Income Taxes - Deferred Tax Assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://revivapharma.com/20251231/role/statement-note-8-income-taxes-deferred-tax-assets-details</Role>
      <ShortName>Note 8 - Income Taxes - Deferred Tax Assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>53</Position>
    </Report>
    <Report instance="rvph20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>995593 - Disclosure - Note 8 - Income Taxes - Schedule of Unrecognized Tax Benefits (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://revivapharma.com/20251231/role/statement-note-8-income-taxes-schedule-of-unrecognized-tax-benefits-details</Role>
      <ShortName>Note 8 - Income Taxes - Schedule of Unrecognized Tax Benefits (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>54</Position>
    </Report>
    <Report instance="rvph20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>995594 - Disclosure - Note 9 - Segment Information (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://revivapharma.com/20251231/role/statement-note-9-segment-information-details-textual</Role>
      <ShortName>Note 9 - Segment Information (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://revivapharma.com/20251231/role/statement-note-9-segment-information</ParentRole>
      <Position>55</Position>
    </Report>
    <Report instance="rvph20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>995595 - Disclosure - Note 10 - Subsequent Events (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://revivapharma.com/20251231/role/statement-note-10-subsequent-events-details-textual</Role>
      <ShortName>Note 10 - Subsequent Events (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://revivapharma.com/20251231/role/statement-note-10-subsequent-events</ParentRole>
      <Position>56</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <InputFiles>
    <File>rvph-20251231.xsd</File>
    <File>rvph-20251231_cal.xml</File>
    <File>rvph-20251231_def.xml</File>
    <File>rvph-20251231_lab.xml</File>
    <File>rvph-20251231_pre.xml</File>
    <File doctype="10-K" isDefinitelyFs="true" isUsgaap="true" original="rvph20251231_10k.htm">rvph20251231_10k.htm</File>
  </InputFiles>
  <SupplementalFiles>
    <File>fig02.jpg</File>
    <File>fig03.jpg</File>
    <File>fig04.jpg</File>
    <File>fig05a.jpg</File>
    <File>fig05b.jpg</File>
    <File>fig05c.jpg</File>
    <File>fig05d.jpg</File>
    <File>fig06.jpg</File>
    <File>fig07a.jpg</File>
    <File>fig07b.jpg</File>
    <File>fig07c.jpg</File>
    <File>fig08.jpg</File>
    <File>fig09.jpg</File>
    <File>fig10.jpg</File>
    <File>fig11.jpg</File>
    <File>fig12.jpg</File>
    <File>fig14.jpg</File>
    <File>fig15.jpg</File>
    <File>figure_13.jpg</File>
    <File>reviva.jpg</File>
    <File>table03.jpg</File>
    <File>table04.jpg</File>
  </SupplementalFiles>
  <BaseTaxonomies>
    <BaseTaxonomy items="703">http://fasb.org/us-gaap/2025</BaseTaxonomy>
    <BaseTaxonomy items="13">http://xbrl.sec.gov/cyd/2025</BaseTaxonomy>
    <BaseTaxonomy items="37">http://xbrl.sec.gov/dei/2025</BaseTaxonomy>
    <BaseTaxonomy items="8">http://xbrl.sec.gov/ecd/2025</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
