<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.26.1</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>217</ContextCount>
  <ElementCount>358</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>false</FootnotesReported>
  <SegmentCount>77</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>4</UnitCount>
  <MyReports>
    <Report instance="awx20251231_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://avalonholdings.com/20251231/role/statement-document-and-entity-information</Role>
      <ShortName>Document And Entity Information</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="awx20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>001 - Statement - Condensed Consolidated Balance Sheets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://avalonholdings.com/20251231/role/statement-condensed-consolidated-balance-sheets</Role>
      <ShortName>Condensed Consolidated Balance Sheets</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="awx20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>002 - Statement - Condensed Consolidated Balance Sheets (Parentheticals)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://avalonholdings.com/20251231/role/statement-condensed-consolidated-balance-sheets-parentheticals</Role>
      <ShortName>Condensed Consolidated Balance Sheets (Parentheticals)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="awx20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>003 - Statement - Condensed Consolidated Statements of Operations</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://avalonholdings.com/20251231/role/statement-condensed-consolidated-statements-of-operations</Role>
      <ShortName>Condensed Consolidated Statements of Operations</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="awx20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>004 - Statement - Condensed Consolidated Statements of Cash Flows</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://avalonholdings.com/20251231/role/statement-condensed-consolidated-statements-of-cash-flows</Role>
      <ShortName>Condensed Consolidated Statements of Cash Flows</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="awx20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>005 - Statement - Condensed Consolidated Statement of Shareholders' Equity (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://avalonholdings.com/20251231/role/statement-condensed-consolidated-statement-of-shareholders-equity-unaudited-</Role>
      <ShortName>Condensed Consolidated Statement of Shareholders' Equity (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="awx20251231_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="awx20251231_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="awx20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.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>9</Position>
    </Report>
    <Report instance="awx20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>995552 - Disclosure - Note 1 - Description of Business</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://avalonholdings.com/20251231/role/statement-note-1-description-of-business</Role>
      <ShortName>Note 1 - Description of Business</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="awx20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>995553 - Disclosure - Note 2 - Summary of Significant Accounting Policies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://avalonholdings.com/20251231/role/statement-note-2-summary-of-significant-accounting-policies</Role>
      <ShortName>Note 2 - Summary of Significant Accounting Policies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="awx20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>995554 - Disclosure - Note 3 - Recent Accounting Pronouncements</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://avalonholdings.com/20251231/role/statement-note-3-recent-accounting-pronouncements</Role>
      <ShortName>Note 3 - Recent Accounting Pronouncements</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="awx20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>995555 - Disclosure - Note 4 - Cash, Cash Equivalents and Restricted Cash</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://avalonholdings.com/20251231/role/statement-note-4-cash-cash-equivalents-and-restricted-cash</Role>
      <ShortName>Note 4 - Cash, Cash Equivalents and Restricted Cash</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="awx20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>995556 - Disclosure - Note 5 - Revenues</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://avalonholdings.com/20251231/role/statement-note-5-revenues</Role>
      <ShortName>Note 5 - Revenues</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="awx20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>995557 - Disclosure - Note 6 - Property and Equipment</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://avalonholdings.com/20251231/role/statement-note-6-property-and-equipment</Role>
      <ShortName>Note 6 - Property and Equipment</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="awx20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>995558 - Disclosure - Note 7 - Leases</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://avalonholdings.com/20251231/role/statement-note-7-leases</Role>
      <ShortName>Note 7 - Leases</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="awx20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>995559 - Disclosure - Note 8 - Basic Net Income Per Share</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://avalonholdings.com/20251231/role/statement-note-8-basic-net-income-per-share</Role>
      <ShortName>Note 8 - Basic Net Income Per Share</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="awx20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>995560 - Disclosure - Note 9 - Term Loans and Line of Credit Agreements</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://avalonholdings.com/20251231/role/statement-note-9-term-loans-and-line-of-credit-agreements</Role>
      <ShortName>Note 9 - Term Loans and Line of Credit Agreements</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="awx20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>995561 - Disclosure - Note 10 - Income Taxes</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://avalonholdings.com/20251231/role/statement-note-10-income-taxes</Role>
      <ShortName>Note 10 - Income Taxes</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="awx20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>995562 - Disclosure - Note 11 - Retirement Benefits</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://avalonholdings.com/20251231/role/statement-note-11-retirement-benefits-</Role>
      <ShortName>Note 11 - Retirement Benefits</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="awx20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>995563 - Disclosure - Note 1 - Long-term Incentive Plan</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://avalonholdings.com/20251231/role/statement-note-1-longterm-incentive-plan</Role>
      <ShortName>Note 1 - Long-term Incentive Plan</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="awx20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>995564 - Disclosure - Note 13 - Shareholders' Equity</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://avalonholdings.com/20251231/role/statement-note-13-shareholders-equity-</Role>
      <ShortName>Note 13 - Shareholders' Equity</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>22</Position>
    </Report>
    <Report instance="awx20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>995565 - Disclosure - Note 14 - Legal Matters</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://avalonholdings.com/20251231/role/statement-note-14-legal-matters</Role>
      <ShortName>Note 14 - Legal Matters</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>23</Position>
    </Report>
    <Report instance="awx20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>995566 - Disclosure - Note 15 - Business Segment Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://avalonholdings.com/20251231/role/statement-note-15-business-segment-information</Role>
      <ShortName>Note 15 - Business Segment Information</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>24</Position>
    </Report>
    <Report instance="awx20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>995567 - Disclosure - Note 16 - Certain Relationships and Related Transactions</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://avalonholdings.com/20251231/role/statement-note-16-certain-relationships-and-related-transactions</Role>
      <ShortName>Note 16 - Certain Relationships and Related Transactions</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>25</Position>
    </Report>
    <Report instance="awx20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>995568 - Disclosure - Note 17 - Injection Wells Suspension</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://avalonholdings.com/20251231/role/statement-note-17-injection-wells-suspension</Role>
      <ShortName>Note 17 - Injection Wells Suspension</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>26</Position>
    </Report>
    <Report instance="awx20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>995569 - Disclosure - Significant Accounting Policies (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://avalonholdings.com/20251231/role/statement-significant-accounting-policies-policies</Role>
      <ShortName>Significant Accounting Policies (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <ParentRole>http://avalonholdings.com/20251231/role/statement-note-2-summary-of-significant-accounting-policies</ParentRole>
      <Position>27</Position>
    </Report>
    <Report instance="awx20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>995570 - Disclosure - Note 4 - Cash, Cash Equivalents and Restricted Cash (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://avalonholdings.com/20251231/role/statement-note-4-cash-cash-equivalents-and-restricted-cash-tables</Role>
      <ShortName>Note 4 - Cash, Cash Equivalents and Restricted Cash (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://avalonholdings.com/20251231/role/statement-note-4-cash-cash-equivalents-and-restricted-cash</ParentRole>
      <Position>28</Position>
    </Report>
    <Report instance="awx20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>995571 - Disclosure - Note 5 - Revenues (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://avalonholdings.com/20251231/role/statement-note-5-revenues-tables</Role>
      <ShortName>Note 5 - Revenues (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://avalonholdings.com/20251231/role/statement-note-5-revenues</ParentRole>
      <Position>29</Position>
    </Report>
    <Report instance="awx20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>995572 - Disclosure - Note 6 - Property and Equipment (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://avalonholdings.com/20251231/role/statement-note-6-property-and-equipment-tables</Role>
      <ShortName>Note 6 - Property and Equipment (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://avalonholdings.com/20251231/role/statement-note-6-property-and-equipment</ParentRole>
      <Position>30</Position>
    </Report>
    <Report instance="awx20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>995573 - Disclosure - Note 7 - Leases (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://avalonholdings.com/20251231/role/statement-note-7-leases-tables</Role>
      <ShortName>Note 7 - Leases (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://avalonholdings.com/20251231/role/statement-note-7-leases</ParentRole>
      <Position>31</Position>
    </Report>
    <Report instance="awx20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>995574 - Disclosure - Note 9 - Term Loans and Line of Credit Agreements (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://avalonholdings.com/20251231/role/statement-note-9-term-loans-and-line-of-credit-agreements-tables</Role>
      <ShortName>Note 9 - Term Loans and Line of Credit Agreements (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://avalonholdings.com/20251231/role/statement-note-9-term-loans-and-line-of-credit-agreements</ParentRole>
      <Position>32</Position>
    </Report>
    <Report instance="awx20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>995575 - Disclosure - Note 10 - Income Taxes (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://avalonholdings.com/20251231/role/statement-note-10-income-taxes-tables</Role>
      <ShortName>Note 10 - Income Taxes (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://avalonholdings.com/20251231/role/statement-note-10-income-taxes</ParentRole>
      <Position>33</Position>
    </Report>
    <Report instance="awx20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>995576 - Disclosure - Note 1 - Long-term Incentive Plan (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://avalonholdings.com/20251231/role/statement-note-1-longterm-incentive-plan-tables</Role>
      <ShortName>Note 1 - Long-term Incentive Plan (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://avalonholdings.com/20251231/role/statement-note-1-longterm-incentive-plan</ParentRole>
      <Position>34</Position>
    </Report>
    <Report instance="awx20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>995577 - Disclosure - Note 15 - Business Segment Information (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://avalonholdings.com/20251231/role/statement-note-15-business-segment-information-tables</Role>
      <ShortName>Note 15 - Business Segment Information (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://avalonholdings.com/20251231/role/statement-note-15-business-segment-information</ParentRole>
      <Position>35</Position>
    </Report>
    <Report instance="awx20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>995578 - Disclosure - Note 2 - Summary of Significant Accounting Policies (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://avalonholdings.com/20251231/role/statement-note-2-summary-of-significant-accounting-policies-details-textual</Role>
      <ShortName>Note 2 - Summary of Significant Accounting Policies (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>36</Position>
    </Report>
    <Report instance="awx20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>995579 - Disclosure - Note 4 - Cash, Cash Equivalents and Restricted Cash - Cash, Cash Equivalents and Restricted Cash (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://avalonholdings.com/20251231/role/statement-note-4-cash-cash-equivalents-and-restricted-cash-cash-cash-equivalents-and-restricted-cash-details</Role>
      <ShortName>Note 4 - Cash, Cash Equivalents and Restricted Cash - Cash, Cash Equivalents and Restricted Cash (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>37</Position>
    </Report>
    <Report instance="awx20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>995580 - Disclosure - Note 5 - Revenues (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://avalonholdings.com/20251231/role/statement-note-5-revenues-details-textual</Role>
      <ShortName>Note 5 - Revenues (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://avalonholdings.com/20251231/role/statement-note-5-revenues-tables</ParentRole>
      <Position>38</Position>
    </Report>
    <Report instance="awx20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>995581 - Disclosure - Note 5 - Revenues - Disaggregation of Revenue (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://avalonholdings.com/20251231/role/statement-note-5-revenues-disaggregation-of-revenue-details</Role>
      <ShortName>Note 5 - Revenues - Disaggregation of Revenue (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>39</Position>
    </Report>
    <Report instance="awx20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>995582 - Disclosure - Note 5 - Revenues - Allowance for Doubtful Accounts (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://avalonholdings.com/20251231/role/statement-note-5-revenues-allowance-for-doubtful-accounts-details</Role>
      <ShortName>Note 5 - Revenues - Allowance for Doubtful Accounts (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>40</Position>
    </Report>
    <Report instance="awx20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>995583 - Disclosure - Note 5 - Revenues - Contract Assets and Liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://avalonholdings.com/20251231/role/statement-note-5-revenues-contract-assets-and-liabilities-details</Role>
      <ShortName>Note 5 - Revenues - Contract Assets and Liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>41</Position>
    </Report>
    <Report instance="awx20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>995584 - Disclosure - Note 6 - Property and Equipment (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://avalonholdings.com/20251231/role/statement-note-6-property-and-equipment-details-textual</Role>
      <ShortName>Note 6 - Property and Equipment (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://avalonholdings.com/20251231/role/statement-note-6-property-and-equipment-tables</ParentRole>
      <Position>42</Position>
    </Report>
    <Report instance="awx20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>995585 - Disclosure - Note 6 - Property and Equipment - Summary of Property and Equipment (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://avalonholdings.com/20251231/role/statement-note-6-property-and-equipment-summary-of-property-and-equipment-details</Role>
      <ShortName>Note 6 - Property and Equipment - Summary of Property and Equipment (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>43</Position>
    </Report>
    <Report instance="awx20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>995586 - Disclosure - Note 7 - Leases (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://avalonholdings.com/20251231/role/statement-note-7-leases-details-textual</Role>
      <ShortName>Note 7 - Leases (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://avalonholdings.com/20251231/role/statement-note-7-leases-tables</ParentRole>
      <Position>44</Position>
    </Report>
    <Report instance="awx20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>995587 - Disclosure - Note 7 - Leases - Operating Leases Assets and Liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://avalonholdings.com/20251231/role/statement-note-7-leases-operating-leases-assets-and-liabilities-details</Role>
      <ShortName>Note 7 - Leases - Operating Leases Assets and Liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>45</Position>
    </Report>
    <Report instance="awx20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>995588 - Disclosure - Note 7 - Leases - Lease Cost (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://avalonholdings.com/20251231/role/statement-note-7-leases-lease-cost-details</Role>
      <ShortName>Note 7 - Leases - Lease Cost (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>46</Position>
    </Report>
    <Report instance="awx20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>995589 - Disclosure - Note 7 - Leases - Future Commitments Under Long-term Leases (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://avalonholdings.com/20251231/role/statement-note-7-leases-future-commitments-under-longterm-leases-details</Role>
      <ShortName>Note 7 - Leases - Future Commitments Under Long-term Leases (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>47</Position>
    </Report>
    <Report instance="awx20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>995590 - Disclosure - Note 8 - Basic Net Income Per Share (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://avalonholdings.com/20251231/role/statement-note-8-basic-net-income-per-share-details-textual</Role>
      <ShortName>Note 8 - Basic Net Income Per Share (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://avalonholdings.com/20251231/role/statement-note-8-basic-net-income-per-share</ParentRole>
      <Position>48</Position>
    </Report>
    <Report instance="awx20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>995591 - Disclosure - Note 9 - Term Loans and Line of Credit Agreements (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://avalonholdings.com/20251231/role/statement-note-9-term-loans-and-line-of-credit-agreements-details-textual</Role>
      <ShortName>Note 9 - Term Loans and Line of Credit Agreements (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://avalonholdings.com/20251231/role/statement-note-9-term-loans-and-line-of-credit-agreements-tables</ParentRole>
      <Position>49</Position>
    </Report>
    <Report instance="awx20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>995592 - Disclosure - Note 9 - Term Loans and Line of Credit Agreements - Summary of Term Loan and Line of Credit Agreements (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://avalonholdings.com/20251231/role/statement-note-9-term-loans-and-line-of-credit-agreements-summary-of-term-loan-and-line-of-credit-agreements-details</Role>
      <ShortName>Note 9 - Term Loans and Line of Credit Agreements - Summary of Term Loan and Line of Credit Agreements (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>50</Position>
    </Report>
    <Report instance="awx20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>995593 - Disclosure - Note 9 - Term Loans and Line of Credit Agreements - Future Maturities of Long-term Debt (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://avalonholdings.com/20251231/role/statement-note-9-term-loans-and-line-of-credit-agreements-future-maturities-of-longterm-debt-details</Role>
      <ShortName>Note 9 - Term Loans and Line of Credit Agreements - Future Maturities of Long-term Debt (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>51</Position>
    </Report>
    <Report instance="awx20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>995594 - Disclosure - Note 10 - Income Taxes (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://avalonholdings.com/20251231/role/statement-note-10-income-taxes-details-textual</Role>
      <ShortName>Note 10 - Income Taxes (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://avalonholdings.com/20251231/role/statement-note-10-income-taxes-tables</ParentRole>
      <Position>52</Position>
    </Report>
    <Report instance="awx20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>995595 - Disclosure - Note 10 - Income Taxes - Provision For Income Taxes (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://avalonholdings.com/20251231/role/statement-note-10-income-taxes-provision-for-income-taxes-details</Role>
      <ShortName>Note 10 - Income Taxes - Provision For Income Taxes (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>53</Position>
    </Report>
    <Report instance="awx20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>995596 - Disclosure - Note 10 - Income Taxes - Schedule of Effective Income Taxes (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://avalonholdings.com/20251231/role/statement-note-10-income-taxes-schedule-of-effective-income-taxes-details</Role>
      <ShortName>Note 10 - Income Taxes - Schedule of Effective Income Taxes (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>54</Position>
    </Report>
    <Report instance="awx20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>995597 - Disclosure - Noe 10 - Income Taxes - Schedule of Income Taxes Paid (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://avalonholdings.com/20251231/role/statement-noe-10-income-taxes-schedule-of-income-taxes-paid-details</Role>
      <ShortName>Noe 10 - Income Taxes - Schedule of Income Taxes Paid (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>55</Position>
    </Report>
    <Report instance="awx20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>995598 - Disclosure - Note 10 - Income Taxes - Deferred Tax Assets and liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://avalonholdings.com/20251231/role/statement-note-10-income-taxes-deferred-tax-assets-and-liabilities-details</Role>
      <ShortName>Note 10 - Income Taxes - Deferred Tax Assets and liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>56</Position>
    </Report>
    <Report instance="awx20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>995599 - Disclosure - Note 11 - Retirement Benefits (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://avalonholdings.com/20251231/role/statement-note-11-retirement-benefits-details-textual</Role>
      <ShortName>Note 11 - Retirement Benefits (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://avalonholdings.com/20251231/role/statement-note-11-retirement-benefits-</ParentRole>
      <Position>57</Position>
    </Report>
    <Report instance="awx20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>995600 - Disclosure - Note 1 - Long-term Incentive Plan (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://avalonholdings.com/20251231/role/statement-note-1-longterm-incentive-plan-details-textual</Role>
      <ShortName>Note 1 - Long-term Incentive Plan (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://avalonholdings.com/20251231/role/statement-note-1-longterm-incentive-plan-tables</ParentRole>
      <Position>58</Position>
    </Report>
    <Report instance="awx20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>995601 - Disclosure - Note 12 - Long-term Incentive Plan - Period and Predetermined Stock Price Needed for Vesting (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://avalonholdings.com/20251231/role/statement-note-12-longterm-incentive-plan-period-and-predetermined-stock-price-needed-for-vesting-details</Role>
      <ShortName>Note 12 - Long-term Incentive Plan - Period and Predetermined Stock Price Needed for Vesting (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>59</Position>
    </Report>
    <Report instance="awx20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>995602 - Disclosure - Note 13 - Shareholders' Equity (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://avalonholdings.com/20251231/role/statement-note-13-shareholders-equity-details-textual</Role>
      <ShortName>Note 13 - Shareholders' Equity (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://avalonholdings.com/20251231/role/statement-note-13-shareholders-equity-</ParentRole>
      <Position>60</Position>
    </Report>
    <Report instance="awx20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>995603 - Disclosure - Note 15 - Business Segment Information (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://avalonholdings.com/20251231/role/statement-note-15-business-segment-information-details-textual</Role>
      <ShortName>Note 15 - Business Segment Information (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://avalonholdings.com/20251231/role/statement-note-15-business-segment-information-tables</ParentRole>
      <Position>61</Position>
    </Report>
    <Report instance="awx20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>995604 - Disclosure - Note 15 - Business Segment Information - Segment Reporting Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://avalonholdings.com/20251231/role/statement-note-15-business-segment-information-segment-reporting-information-details</Role>
      <ShortName>Note 15 - Business Segment Information - Segment Reporting Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>62</Position>
    </Report>
    <Report instance="awx20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R63.htm</HtmlFileName>
      <LongName>995605 - Disclosure - Note 15 - Business Segment Information - Segment Reporting Asset Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://avalonholdings.com/20251231/role/statement-note-15-business-segment-information-segment-reporting-asset-information-details</Role>
      <ShortName>Note 15 - Business Segment Information - Segment Reporting Asset Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>63</Position>
    </Report>
    <Report instance="awx20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R64.htm</HtmlFileName>
      <LongName>995606 - Disclosure - Note 16 - Certain Relationships and Related Transactions (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://avalonholdings.com/20251231/role/statement-note-16-certain-relationships-and-related-transactions-details-textual</Role>
      <ShortName>Note 16 - Certain Relationships and Related Transactions (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://avalonholdings.com/20251231/role/statement-note-16-certain-relationships-and-related-transactions</ParentRole>
      <Position>64</Position>
    </Report>
    <Report instance="awx20251231_10k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R65.htm</HtmlFileName>
      <LongName>995607 - Disclosure - Note 17 - Injection Wells Suspension (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://avalonholdings.com/20251231/role/statement-note-17-injection-wells-suspension-details-textual</Role>
      <ShortName>Note 17 - Injection Wells Suspension (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://avalonholdings.com/20251231/role/statement-note-17-injection-wells-suspension</ParentRole>
      <Position>65</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <InputFiles>
    <File>awx-20251231.xsd</File>
    <File>awx-20251231_cal.xml</File>
    <File>awx-20251231_def.xml</File>
    <File>awx-20251231_lab.xml</File>
    <File>awx-20251231_pre.xml</File>
    <File doctype="10-K" isDefinitelyFs="true" isUsgaap="true" original="awx20251231_10k.htm">awx20251231_10k.htm</File>
    <File doctype="10-K" isDefinitelyFs="true" isUsgaap="true" original="ex_932416.htm">ex_932416.htm</File>
  </InputFiles>
  <SupplementalFiles/>
  <BaseTaxonomies>
    <BaseTaxonomy items="684">http://fasb.org/us-gaap/2025</BaseTaxonomy>
    <BaseTaxonomy items="6">http://xbrl.sec.gov/cyd/2025</BaseTaxonomy>
    <BaseTaxonomy items="38">http://xbrl.sec.gov/dei/2025</BaseTaxonomy>
    <BaseTaxonomy items="6">http://xbrl.sec.gov/ecd/2025</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
