<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.22.1</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>168</ContextCount>
  <ElementCount>325</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>true</FootnotesReported>
  <SegmentCount>96</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>4</UnitCount>
  <MyReports>
    <Report instance="f10k2021_chicagoatlant.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>000 - Document - Document And Entity Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://chicagoatlanticcredit.com/role/DocumentAndEntityInformation</Role>
      <ShortName>Document And Entity Information</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="f10k2021_chicagoatlant.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>001 - Statement - Consolidated Balance Sheet</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://chicagoatlanticcredit.com/role/ConsolidatedBalanceSheet</Role>
      <ShortName>Consolidated Balance Sheet</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="f10k2021_chicagoatlant.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>002 - Statement - Consolidated Balance Sheet (Parentheticals)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://chicagoatlanticcredit.com/role/ConsolidatedBalanceSheet_Parentheticals</Role>
      <ShortName>Consolidated Balance Sheet (Parentheticals)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="f10k2021_chicagoatlant.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>003 - Statement - Consolidated Statement of Operations</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://chicagoatlanticcredit.com/role/ConsolidatedIncomeStatement</Role>
      <ShortName>Consolidated Statement of Operations</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="f10k2021_chicagoatlant.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>004 - Statement - Consolidated Statement of Equity</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://chicagoatlanticcredit.com/role/ShareholdersEquityType2or3</Role>
      <ShortName>Consolidated Statement of Equity</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="f10k2021_chicagoatlant.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>005 - Statement - Consolidated Statement of Cash Flows</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://chicagoatlanticcredit.com/role/ConsolidatedCashFlow</Role>
      <ShortName>Consolidated Statement of Cash Flows</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="f10k2021_chicagoatlant.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>006 - Disclosure - Organization and Description of Business</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://chicagoatlanticcredit.com/role/OrganizationandDescriptionofBusiness</Role>
      <ShortName>Organization and Description of Business</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="f10k2021_chicagoatlant.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>007 - Disclosure - Summary of Significant Accounting Policies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://chicagoatlanticcredit.com/role/SummaryofSignificantAccountingPolicies</Role>
      <ShortName>Summary of Significant Accounting Policies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="f10k2021_chicagoatlant.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>008 - Disclosure - Loans Held For Investment, Net</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://chicagoatlanticcredit.com/role/LoansHeldForInvestmentNet</Role>
      <ShortName>Loans Held For Investment, Net</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="f10k2021_chicagoatlant.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>009 - Disclosure - Interest Receivable</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://chicagoatlanticcredit.com/role/InterestReceivable</Role>
      <ShortName>Interest Receivable</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="f10k2021_chicagoatlant.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>010 - Disclosure - Interest Reserve</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://chicagoatlanticcredit.com/role/InterestReserve</Role>
      <ShortName>Interest Reserve</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="f10k2021_chicagoatlant.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>011 - Disclosure - Debt</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://chicagoatlanticcredit.com/role/Debt</Role>
      <ShortName>Debt</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="f10k2021_chicagoatlant.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>012 - Disclosure - Related Party Transactions</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://chicagoatlanticcredit.com/role/RelatedPartyTransactions</Role>
      <ShortName>Related Party Transactions</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="f10k2021_chicagoatlant.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>013 - Disclosure - Commitments and Contingencies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://chicagoatlanticcredit.com/role/CommitmentsandContingencies</Role>
      <ShortName>Commitments and Contingencies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="f10k2021_chicagoatlant.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>014 - Disclosure - Stockholders' Equity</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://chicagoatlanticcredit.com/role/StockholdersEquity</Role>
      <ShortName>Stockholders' Equity</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="f10k2021_chicagoatlant.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>015 - Disclosure - Earnings Per Share</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://chicagoatlanticcredit.com/role/EarningsPerShare</Role>
      <ShortName>Earnings Per Share</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="f10k2021_chicagoatlant.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>016 - Disclosure - Income Tax</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://chicagoatlanticcredit.com/role/IncomeTax</Role>
      <ShortName>Income Tax</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="f10k2021_chicagoatlant.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>017 - Disclosure - Dividends and Distributions</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://chicagoatlanticcredit.com/role/DividendsandDistributions</Role>
      <ShortName>Dividends and Distributions</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="f10k2021_chicagoatlant.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>018 - Disclosure - Subsequent Events</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://chicagoatlanticcredit.com/role/SubsequentEvents</Role>
      <ShortName>Subsequent Events</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="f10k2021_chicagoatlant.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>019 - Disclosure - Accounting Policies, by Policy (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://chicagoatlanticcredit.com/role/AccountingPoliciesByPolicy</Role>
      <ShortName>Accounting Policies, by Policy (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <ParentRole>http://chicagoatlanticcredit.com/role/SummaryofSignificantAccountingPolicies</ParentRole>
      <Position>20</Position>
    </Report>
    <Report instance="f10k2021_chicagoatlant.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>020 - Disclosure - Summary of Significant Accounting Policies (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://chicagoatlanticcredit.com/role/SummaryofSignificantAccountingPoliciesTables</Role>
      <ShortName>Summary of Significant Accounting Policies (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://chicagoatlanticcredit.com/role/SummaryofSignificantAccountingPolicies</ParentRole>
      <Position>21</Position>
    </Report>
    <Report instance="f10k2021_chicagoatlant.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>021 - Disclosure - Loans Held For Investment, Net (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://chicagoatlanticcredit.com/role/LoansHeldForInvestmentNetTables</Role>
      <ShortName>Loans Held For Investment, Net (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://chicagoatlanticcredit.com/role/LoansHeldForInvestmentNet</ParentRole>
      <Position>22</Position>
    </Report>
    <Report instance="f10k2021_chicagoatlant.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>022 - Disclosure - Interest Receivable (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://chicagoatlanticcredit.com/role/InterestReceivableTables</Role>
      <ShortName>Interest Receivable (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://chicagoatlanticcredit.com/role/InterestReceivable</ParentRole>
      <Position>23</Position>
    </Report>
    <Report instance="f10k2021_chicagoatlant.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>023 - Disclosure - Interest Reserve (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://chicagoatlanticcredit.com/role/InterestReserveTables</Role>
      <ShortName>Interest Reserve (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://chicagoatlanticcredit.com/role/InterestReserve</ParentRole>
      <Position>24</Position>
    </Report>
    <Report instance="f10k2021_chicagoatlant.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>024 - Disclosure - Related Party Transactions (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://chicagoatlanticcredit.com/role/RelatedPartyTransactionsTables</Role>
      <ShortName>Related Party Transactions (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://chicagoatlanticcredit.com/role/RelatedPartyTransactions</ParentRole>
      <Position>25</Position>
    </Report>
    <Report instance="f10k2021_chicagoatlant.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>025 - Disclosure - Commitments and Contingencies (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://chicagoatlanticcredit.com/role/CommitmentsandContingenciesTables</Role>
      <ShortName>Commitments and Contingencies (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://chicagoatlanticcredit.com/role/CommitmentsandContingencies</ParentRole>
      <Position>26</Position>
    </Report>
    <Report instance="f10k2021_chicagoatlant.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>026 - Disclosure - Stockholders' Equity (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://chicagoatlanticcredit.com/role/StockholdersEquityTables</Role>
      <ShortName>Stockholders' Equity (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://chicagoatlanticcredit.com/role/StockholdersEquity</ParentRole>
      <Position>27</Position>
    </Report>
    <Report instance="f10k2021_chicagoatlant.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>027 - Disclosure - Earnings Per Share (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://chicagoatlanticcredit.com/role/EarningsPerShareTables</Role>
      <ShortName>Earnings Per Share (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://chicagoatlanticcredit.com/role/EarningsPerShare</ParentRole>
      <Position>28</Position>
    </Report>
    <Report instance="f10k2021_chicagoatlant.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>028 - Disclosure - Dividends and Distributions (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://chicagoatlanticcredit.com/role/DividendsandDistributionsTables</Role>
      <ShortName>Dividends and Distributions (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://chicagoatlanticcredit.com/role/DividendsandDistributions</ParentRole>
      <Position>29</Position>
    </Report>
    <Report instance="f10k2021_chicagoatlant.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>029 - Disclosure - Organization and Description of Business (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://chicagoatlanticcredit.com/role/OrganizationandDescriptionofBusinessDetails</Role>
      <ShortName>Organization and Description of Business (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://chicagoatlanticcredit.com/role/OrganizationandDescriptionofBusiness</ParentRole>
      <Position>30</Position>
    </Report>
    <Report instance="f10k2021_chicagoatlant.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>030 - Disclosure - Summary of Significant Accounting Policies (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://chicagoatlanticcredit.com/role/SummaryofSignificantAccountingPoliciesDetails</Role>
      <ShortName>Summary of Significant Accounting Policies (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://chicagoatlanticcredit.com/role/SummaryofSignificantAccountingPoliciesTables</ParentRole>
      <Position>31</Position>
    </Report>
    <Report instance="f10k2021_chicagoatlant.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>031 - Disclosure - Summary of Significant Accounting Policies (Details) - Schedule of amortized cost and purchase premiums (discounts) of the initial portfolio</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://chicagoatlanticcredit.com/role/ScheduleofamortizedcostandpurchasepremiumsdiscountsoftheinitialportfolioTable</Role>
      <ShortName>Summary of Significant Accounting Policies (Details) - Schedule of amortized cost and purchase premiums (discounts) of the initial portfolio</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://chicagoatlanticcredit.com/role/SummaryofSignificantAccountingPoliciesTables</ParentRole>
      <Position>32</Position>
    </Report>
    <Report instance="f10k2021_chicagoatlant.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>032 - Disclosure - Loans Held For Investment, Net (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://chicagoatlanticcredit.com/role/LoansHeldForInvestmentNetDetails</Role>
      <ShortName>Loans Held For Investment, Net (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://chicagoatlanticcredit.com/role/LoansHeldForInvestmentNetTables</ParentRole>
      <Position>33</Position>
    </Report>
    <Report instance="f10k2021_chicagoatlant.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>033 - Disclosure - Loans Held For Investment, Net (Details) - Schedule of loans held for investment</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://chicagoatlanticcredit.com/role/ScheduleofloansheldforinvestmentTable</Role>
      <ShortName>Loans Held For Investment, Net (Details) - Schedule of loans held for investment</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://chicagoatlanticcredit.com/role/LoansHeldForInvestmentNetTables</ParentRole>
      <Position>34</Position>
    </Report>
    <Report instance="f10k2021_chicagoatlant.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>034 - Disclosure - Loans Held For Investment, Net (Details) - Schedule of changes in loans held at carrying value</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://chicagoatlanticcredit.com/role/ScheduleofchangesinloansheldatcarryingvalueTable</Role>
      <ShortName>Loans Held For Investment, Net (Details) - Schedule of changes in loans held at carrying value</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://chicagoatlanticcredit.com/role/LoansHeldForInvestmentNetTables</ParentRole>
      <Position>35</Position>
    </Report>
    <Report instance="f10k2021_chicagoatlant.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>035 - Disclosure - Loans Held For Investment, Net (Details) - Schedule of loans held at carrying value portfolio based on information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://chicagoatlanticcredit.com/role/ScheduleofloansheldatcarryingvalueportfoliobasedoninformationTable</Role>
      <ShortName>Loans Held For Investment, Net (Details) - Schedule of loans held at carrying value portfolio based on information</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://chicagoatlanticcredit.com/role/LoansHeldForInvestmentNetTables</ParentRole>
      <Position>36</Position>
    </Report>
    <Report instance="f10k2021_chicagoatlant.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>036 - Disclosure - Loans Held For Investment, Net (Details) - Schedule of risk rating</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://chicagoatlanticcredit.com/role/ScheduleofriskratingTable</Role>
      <ShortName>Loans Held For Investment, Net (Details) - Schedule of risk rating</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://chicagoatlanticcredit.com/role/LoansHeldForInvestmentNetTables</ParentRole>
      <Position>37</Position>
    </Report>
    <Report instance="f10k2021_chicagoatlant.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>037 - Disclosure - Loans Held For Investment, Net (Details) - Schedule of carrying value of loans held for investment</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://chicagoatlanticcredit.com/role/ScheduleofcarryingvalueofloansheldforinvestmentTable</Role>
      <ShortName>Loans Held For Investment, Net (Details) - Schedule of carrying value of loans held for investment</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://chicagoatlanticcredit.com/role/LoansHeldForInvestmentNetTables</ParentRole>
      <Position>38</Position>
    </Report>
    <Report instance="f10k2021_chicagoatlant.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>038 - Disclosure - Loans Held For Investment, Net (Details) - Schedule of real estate collateral coverage</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://chicagoatlanticcredit.com/role/ScheduleofrealestatecollateralcoverageTable</Role>
      <ShortName>Loans Held For Investment, Net (Details) - Schedule of real estate collateral coverage</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://chicagoatlanticcredit.com/role/LoansHeldForInvestmentNetTables</ParentRole>
      <Position>39</Position>
    </Report>
    <Report instance="f10k2021_chicagoatlant.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>039 - Disclosure - Loans Held For Investment, Net (Details) - Schedule of activity related to the CECL Reserve for outstanding balances</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://chicagoatlanticcredit.com/role/ScheduleofactivityrelatedtotheCECLReserveforoutstandingbalancesTable</Role>
      <ShortName>Loans Held For Investment, Net (Details) - Schedule of activity related to the CECL Reserve for outstanding balances</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://chicagoatlanticcredit.com/role/LoansHeldForInvestmentNetTables</ParentRole>
      <Position>40</Position>
    </Report>
    <Report instance="f10k2021_chicagoatlant.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>040 - Disclosure - Interest Receivable (Details) - Schedule of summarizes the interest receivable</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://chicagoatlanticcredit.com/role/ScheduleofsummarizestheinterestreceivableTable</Role>
      <ShortName>Interest Receivable (Details) - Schedule of summarizes the interest receivable</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://chicagoatlanticcredit.com/role/InterestReceivableTables</ParentRole>
      <Position>41</Position>
    </Report>
    <Report instance="f10k2021_chicagoatlant.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>041 - Disclosure -  Interest Reserve (Details) - Schedule of changes in interest reserves</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://chicagoatlanticcredit.com/role/ScheduleofchangesininterestreservesTable</Role>
      <ShortName>Interest Reserve (Details) - Schedule of changes in interest reserves</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://chicagoatlanticcredit.com/role/InterestReserveTables</ParentRole>
      <Position>42</Position>
    </Report>
    <Report instance="f10k2021_chicagoatlant.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>042 - Disclosure - Debt (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://chicagoatlanticcredit.com/role/DebtDetails</Role>
      <ShortName>Debt (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://chicagoatlanticcredit.com/role/Debt</ParentRole>
      <Position>43</Position>
    </Report>
    <Report instance="f10k2021_chicagoatlant.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>043 - Disclosure - Related Party Transactions (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://chicagoatlanticcredit.com/role/RelatedPartyTransactionsDetails</Role>
      <ShortName>Related Party Transactions (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://chicagoatlanticcredit.com/role/RelatedPartyTransactionsTables</ParentRole>
      <Position>44</Position>
    </Report>
    <Report instance="f10k2021_chicagoatlant.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>044 - Disclosure - Related Party Transactions (Details) - Schedule of related party costs and amounts payable to the manager</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://chicagoatlanticcredit.com/role/ScheduleofrelatedpartycostsandamountspayabletothemanagerTable</Role>
      <ShortName>Related Party Transactions (Details) - Schedule of related party costs and amounts payable to the manager</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://chicagoatlanticcredit.com/role/RelatedPartyTransactionsTables</ParentRole>
      <Position>45</Position>
    </Report>
    <Report instance="f10k2021_chicagoatlant.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>045 - Disclosure - Commitments and Contingencies (Details) - Schedule of commitments to fund various existing loans</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://chicagoatlanticcredit.com/role/ScheduleofcommitmentstofundvariousexistingloansTable</Role>
      <ShortName>Commitments and Contingencies (Details) - Schedule of commitments to fund various existing loans</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://chicagoatlanticcredit.com/role/CommitmentsandContingenciesTables</ParentRole>
      <Position>46</Position>
    </Report>
    <Report instance="f10k2021_chicagoatlant.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>046 - Disclosure - Stockholders' Equity (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://chicagoatlanticcredit.com/role/StockholdersEquityDetails</Role>
      <ShortName>Stockholders' Equity (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://chicagoatlanticcredit.com/role/StockholdersEquityTables</ParentRole>
      <Position>47</Position>
    </Report>
    <Report instance="f10k2021_chicagoatlant.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>047 - Disclosure - Stockholders' Equity (Details) - Schedule of Stockholders??? Equity</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://chicagoatlanticcredit.com/role/ScheduleofStockholdersEquityTable</Role>
      <ShortName>Stockholders' Equity (Details) - Schedule of Stockholders??? Equity</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://chicagoatlanticcredit.com/role/StockholdersEquityTables</ParentRole>
      <Position>48</Position>
    </Report>
    <Report instance="f10k2021_chicagoatlant.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>048 - Disclosure - Earnings Per Share (Details) - Schedule of basic earnings per common share</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://chicagoatlanticcredit.com/role/ScheduleofbasicearningspercommonshareTable</Role>
      <ShortName>Earnings Per Share (Details) - Schedule of basic earnings per common share</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://chicagoatlanticcredit.com/role/EarningsPerShareTables</ParentRole>
      <Position>49</Position>
    </Report>
    <Report instance="f10k2021_chicagoatlant.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>049 - Disclosure - Income Tax (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://chicagoatlanticcredit.com/role/IncomeTaxDetails</Role>
      <ShortName>Income Tax (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://chicagoatlanticcredit.com/role/IncomeTax</ParentRole>
      <Position>50</Position>
    </Report>
    <Report instance="f10k2021_chicagoatlant.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>050 - Disclosure - Dividends and Distributions (Details) - Schedule of dividends declared</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://chicagoatlanticcredit.com/role/ScheduleofdividendsdeclaredTable</Role>
      <ShortName>Dividends and Distributions (Details) - Schedule of dividends declared</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://chicagoatlanticcredit.com/role/DividendsandDistributionsTables</ParentRole>
      <Position>51</Position>
    </Report>
    <Report instance="f10k2021_chicagoatlant.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>051 - Disclosure - Subsequent Events (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://chicagoatlanticcredit.com/role/SubsequentEventsDetails</Role>
      <ShortName>Subsequent Events (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://chicagoatlanticcredit.com/role/SubsequentEvents</ParentRole>
      <Position>52</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <InputFiles>
    <File doctype="10-K" original="f10k2021_chicagoatlant.htm">f10k2021_chicagoatlant.htm</File>
    <File>f10k2021ex31-1_chicago.htm</File>
    <File>f10k2021ex31-2_chicago.htm</File>
    <File>f10k2021ex32-1_chicago.htm</File>
    <File>f10k2021ex32-2_chicago.htm</File>
    <File>f10k2021ex4-2_chicago.htm</File>
    <File>refi-20211231.xsd</File>
    <File>refi-20211231_cal.xml</File>
    <File>refi-20211231_def.xml</File>
    <File>refi-20211231_lab.xml</File>
    <File>refi-20211231_pre.xml</File>
  </InputFiles>
  <SupplementalFiles/>
  <BaseTaxonomies>
    <BaseTaxonomy items="1">http://fasb.org/srt/2021-01-31</BaseTaxonomy>
    <BaseTaxonomy items="310">http://fasb.org/us-gaap/2021-01-31</BaseTaxonomy>
    <BaseTaxonomy items="38">http://xbrl.sec.gov/dei/2021q4</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
