<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.22.1</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>495</ContextCount>
  <ElementCount>342</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>true</FootnotesReported>
  <SegmentCount>78</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>6</UnitCount>
  <MyReports>
    <Report instance="qnto20220331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>000 - Document - Document And Entity Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.quaintoak.com/20220331/role/statement-document-and-entity-information</Role>
      <ShortName>Document And Entity Information</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="qnto20220331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>001 - Statement - Consolidated Balance Sheets (Current Period Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.quaintoak.com/20220331/role/statement-consolidated-balance-sheets-current-period-unaudited</Role>
      <ShortName>Consolidated Balance Sheets (Current Period Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="qnto20220331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>002 - Statement - Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.quaintoak.com/20220331/role/statement-consolidated-balance-sheets-current-period-unaudited-parentheticals</Role>
      <ShortName>Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="qnto20220331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>003 - Statement - Consolidated Statements of Income (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.quaintoak.com/20220331/role/statement-consolidated-statements-of-income-unaudited</Role>
      <ShortName>Consolidated Statements of Income (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="qnto20220331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>004 - Statement - Consolidated Statements of Comprehensive Income (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.quaintoak.com/20220331/role/statement-consolidated-statements-of-comprehensive-income-unaudited</Role>
      <ShortName>Consolidated Statements of Comprehensive Income (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="qnto20220331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>005 - Statement - Consolidated Statements of Stockholders' Equity (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.quaintoak.com/20220331/role/statement-consolidated-statements-of-stockholders-equity-unaudited</Role>
      <ShortName>Consolidated Statements of Stockholders' Equity (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="qnto20220331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>006 - Statement - Consolidated Statements of Stockholders' Equity (Unaudited) (Parentheticals)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.quaintoak.com/20220331/role/statement-consolidated-statements-of-stockholders-equity-unaudited-parentheticals</Role>
      <ShortName>Consolidated Statements of Stockholders' Equity (Unaudited) (Parentheticals)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="qnto20220331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>007 - Statement - Consolidated Statements of Cash Flows (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.quaintoak.com/20220331/role/statement-consolidated-statements-of-cash-flows-unaudited</Role>
      <ShortName>Consolidated Statements of Cash Flows (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="qnto20220331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>008 - Disclosure - Note 1 - Financial Statement Presentation and Significant Accounting Policies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.quaintoak.com/20220331/role/statement-note-1-financial-statement-presentation-and-significant-accounting-policies</Role>
      <ShortName>Note 1 - Financial Statement Presentation and Significant Accounting Policies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="qnto20220331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>009 - Disclosure - Note 2 - Earnings Per Share</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.quaintoak.com/20220331/role/statement-note-2-earnings-per-share</Role>
      <ShortName>Note 2 - Earnings Per Share</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="qnto20220331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>010 - Disclosure - Note 3 - Accumulated Other Comprehensive Income (Loss)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.quaintoak.com/20220331/role/statement-note-3-accumulated-other-comprehensive-income-loss</Role>
      <ShortName>Note 3 - Accumulated Other Comprehensive Income (Loss)</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="qnto20220331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>011 - Disclosure - Note 4 - Investment in Interest-earning Time Deposits</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.quaintoak.com/20220331/role/statement-note-4-investment-in-interestearning-time-deposits</Role>
      <ShortName>Note 4 - Investment in Interest-earning Time Deposits</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="qnto20220331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>012 - Disclosure - Note 5 - Investment Securities Available for Sale</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.quaintoak.com/20220331/role/statement-note-5-investment-securities-available-for-sale</Role>
      <ShortName>Note 5 - Investment Securities Available for Sale</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="qnto20220331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>013 - Disclosure - Note 6 - Loans Receivable, Net and Allowance for Loan Losses</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.quaintoak.com/20220331/role/statement-note-6-loans-receivable-net-and-allowance-for-loan-losses</Role>
      <ShortName>Note 6 - Loans Receivable, Net and Allowance for Loan Losses</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="qnto20220331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>014 - Disclosure - Note 7 - Goodwill and Other Intangible, Net</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.quaintoak.com/20220331/role/statement-note-7-goodwill-and-other-intangible-net-</Role>
      <ShortName>Note 7 - Goodwill and Other Intangible, Net</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="qnto20220331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>015 - Disclosure - Note 8 - Deposits</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.quaintoak.com/20220331/role/statement-note-8-deposits</Role>
      <ShortName>Note 8 - Deposits</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="qnto20220331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>016 - Disclosure - Note 9 - Borrowings</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.quaintoak.com/20220331/role/statement-note-9-borrowings</Role>
      <ShortName>Note 9 - Borrowings</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="qnto20220331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>017 - Disclosure - Note 10 - Stock Compensation Plans</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.quaintoak.com/20220331/role/statement-note-10-stock-compensation-plans</Role>
      <ShortName>Note 10 - Stock Compensation Plans</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="qnto20220331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>018 - Disclosure - Note 11 - Fair Value Measurements and Fair Values of Financial Instruments</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.quaintoak.com/20220331/role/statement-note-11-fair-value-measurements-and-fair-values-of-financial-instruments</Role>
      <ShortName>Note 11 - Fair Value Measurements and Fair Values of Financial Instruments</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="qnto20220331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>019 - Disclosure - Note 12 - Operating Segments</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.quaintoak.com/20220331/role/statement-note-12-operating-segments</Role>
      <ShortName>Note 12 - Operating Segments</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="qnto20220331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>020 - Disclosure - Note 13 - Subsequent Event</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.quaintoak.com/20220331/role/statement-note-13-subsequent-event</Role>
      <ShortName>Note 13 - Subsequent Event</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="qnto20220331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>021 - Disclosure - Significant Accounting Policies (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.quaintoak.com/20220331/role/statement-significant-accounting-policies-policies</Role>
      <ShortName>Significant Accounting Policies (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <ParentRole>http://www.quaintoak.com/20220331/role/statement-note-1-financial-statement-presentation-and-significant-accounting-policies</ParentRole>
      <Position>22</Position>
    </Report>
    <Report instance="qnto20220331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>022 - Disclosure - Note 2 - Earnings Per Share (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.quaintoak.com/20220331/role/statement-note-2-earnings-per-share-tables</Role>
      <ShortName>Note 2 - Earnings Per Share (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.quaintoak.com/20220331/role/statement-note-2-earnings-per-share</ParentRole>
      <Position>23</Position>
    </Report>
    <Report instance="qnto20220331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>023 - Disclosure - Note 3 - Accumulated Other Comprehensive Income (Loss) (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.quaintoak.com/20220331/role/statement-note-3-accumulated-other-comprehensive-income-loss-tables</Role>
      <ShortName>Note 3 - Accumulated Other Comprehensive Income (Loss) (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.quaintoak.com/20220331/role/statement-note-3-accumulated-other-comprehensive-income-loss</ParentRole>
      <Position>24</Position>
    </Report>
    <Report instance="qnto20220331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>024 - Disclosure - Note 4 - Investment in Interest-earning Time Deposits (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.quaintoak.com/20220331/role/statement-note-4-investment-in-interestearning-time-deposits-tables</Role>
      <ShortName>Note 4 - Investment in Interest-earning Time Deposits (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.quaintoak.com/20220331/role/statement-note-4-investment-in-interestearning-time-deposits</ParentRole>
      <Position>25</Position>
    </Report>
    <Report instance="qnto20220331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>025 - Disclosure - Note 5 - Investment Securities Available for Sale (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.quaintoak.com/20220331/role/statement-note-5-investment-securities-available-for-sale-tables</Role>
      <ShortName>Note 5 - Investment Securities Available for Sale (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.quaintoak.com/20220331/role/statement-note-5-investment-securities-available-for-sale</ParentRole>
      <Position>26</Position>
    </Report>
    <Report instance="qnto20220331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>026 - Disclosure - Note 6 - Loans Receivable, Net and Allowance for Loan Losses (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.quaintoak.com/20220331/role/statement-note-6-loans-receivable-net-and-allowance-for-loan-losses-tables</Role>
      <ShortName>Note 6 - Loans Receivable, Net and Allowance for Loan Losses (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.quaintoak.com/20220331/role/statement-note-6-loans-receivable-net-and-allowance-for-loan-losses</ParentRole>
      <Position>27</Position>
    </Report>
    <Report instance="qnto20220331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>027 - Disclosure - Note 8 - Deposits (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.quaintoak.com/20220331/role/statement-note-8-deposits-tables</Role>
      <ShortName>Note 8 - Deposits (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.quaintoak.com/20220331/role/statement-note-8-deposits</ParentRole>
      <Position>28</Position>
    </Report>
    <Report instance="qnto20220331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>028 - Disclosure - Note 9 - Borrowings (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.quaintoak.com/20220331/role/statement-note-9-borrowings-tables</Role>
      <ShortName>Note 9 - Borrowings (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.quaintoak.com/20220331/role/statement-note-9-borrowings</ParentRole>
      <Position>29</Position>
    </Report>
    <Report instance="qnto20220331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>029 - Disclosure - Note 10 - Stock Compensation Plans (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.quaintoak.com/20220331/role/statement-note-10-stock-compensation-plans-tables</Role>
      <ShortName>Note 10 - Stock Compensation Plans (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.quaintoak.com/20220331/role/statement-note-10-stock-compensation-plans</ParentRole>
      <Position>30</Position>
    </Report>
    <Report instance="qnto20220331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>030 - Disclosure - Note 11 - Fair Value Measurements and Fair Values of Financial Instruments (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.quaintoak.com/20220331/role/statement-note-11-fair-value-measurements-and-fair-values-of-financial-instruments-tables</Role>
      <ShortName>Note 11 - Fair Value Measurements and Fair Values of Financial Instruments (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.quaintoak.com/20220331/role/statement-note-11-fair-value-measurements-and-fair-values-of-financial-instruments</ParentRole>
      <Position>31</Position>
    </Report>
    <Report instance="qnto20220331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>031 - Disclosure - Note 12 - Operating Segments (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.quaintoak.com/20220331/role/statement-note-12-operating-segments-tables</Role>
      <ShortName>Note 12 - Operating Segments (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.quaintoak.com/20220331/role/statement-note-12-operating-segments</ParentRole>
      <Position>32</Position>
    </Report>
    <Report instance="qnto20220331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>032 - Disclosure - Note 1 - Financial Statement Presentation and Significant Accounting Policies (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.quaintoak.com/20220331/role/statement-note-1-financial-statement-presentation-and-significant-accounting-policies-details-textual</Role>
      <ShortName>Note 1 - Financial Statement Presentation and Significant Accounting Policies (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>33</Position>
    </Report>
    <Report instance="qnto20220331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>033 - Disclosure - Note 2 - Earnings Per Share - Weighted Average Shares Used in Basic and Dilutive Earnings Per Share Computations (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.quaintoak.com/20220331/role/statement-note-2-earnings-per-share-weighted-average-shares-used-in-basic-and-dilutive-earnings-per-share-computations-details</Role>
      <ShortName>Note 2 - Earnings Per Share - Weighted Average Shares Used in Basic and Dilutive Earnings Per Share Computations (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>34</Position>
    </Report>
    <Report instance="qnto20220331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>034 - Disclosure - Note 3 - Accumulated Other Comprehensive Income (Loss) - Changes in Accumulated Other Comprehensive Loss (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.quaintoak.com/20220331/role/statement-note-3-accumulated-other-comprehensive-income-loss-changes-in-accumulated-other-comprehensive-loss-details</Role>
      <ShortName>Note 3 - Accumulated Other Comprehensive Income (Loss) - Changes in Accumulated Other Comprehensive Loss (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.quaintoak.com/20220331/role/statement-note-3-accumulated-other-comprehensive-income-loss-tables</ParentRole>
      <Position>35</Position>
    </Report>
    <Report instance="qnto20220331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>035 - Disclosure - Note 3 - Accumulated Other Comprehensive Income (Loss) - Reclassified Out of Accumulated other Comprehensive Loss (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.quaintoak.com/20220331/role/statement-note-3-accumulated-other-comprehensive-income-loss-reclassified-out-of-accumulated-other-comprehensive-loss-details</Role>
      <ShortName>Note 3 - Accumulated Other Comprehensive Income (Loss) - Reclassified Out of Accumulated other Comprehensive Loss (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.quaintoak.com/20220331/role/statement-note-3-accumulated-other-comprehensive-income-loss-tables</ParentRole>
      <Position>36</Position>
    </Report>
    <Report instance="qnto20220331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>036 - Disclosure - Note 4 - Investment in Interest-earning Time Deposits - Investment in Interest-earnings Time Deposits (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.quaintoak.com/20220331/role/statement-note-4-investment-in-interestearning-time-deposits-investment-in-interestearnings-time-deposits-details</Role>
      <ShortName>Note 4 - Investment in Interest-earning Time Deposits - Investment in Interest-earnings Time Deposits (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>37</Position>
    </Report>
    <Report instance="qnto20220331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>037 - Disclosure - Note 5 - Investment Securities Available for Sale (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.quaintoak.com/20220331/role/statement-note-5-investment-securities-available-for-sale-details-textual</Role>
      <ShortName>Note 5 - Investment Securities Available for Sale (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.quaintoak.com/20220331/role/statement-note-5-investment-securities-available-for-sale-tables</ParentRole>
      <Position>38</Position>
    </Report>
    <Report instance="qnto20220331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>038 - Disclosure - Note 5 - Investment Securities Available for Sale - Amortized Cost and Fair Value of Investment Securities Available for Sale (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.quaintoak.com/20220331/role/statement-note-5-investment-securities-available-for-sale-amortized-cost-and-fair-value-of-investment-securities-available-for-sale-details</Role>
      <ShortName>Note 5 - Investment Securities Available for Sale - Amortized Cost and Fair Value of Investment Securities Available for Sale (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>39</Position>
    </Report>
    <Report instance="qnto20220331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>039 - Disclosure - Note 5 - Investment Securities Available for Sale - Debt Securities by Contractual Maturity (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.quaintoak.com/20220331/role/statement-note-5-investment-securities-available-for-sale-debt-securities-by-contractual-maturity-details</Role>
      <ShortName>Note 5 - Investment Securities Available for Sale - Debt Securities by Contractual Maturity (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>40</Position>
    </Report>
    <Report instance="qnto20220331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>040 - Disclosure - Note 5 - Investment Securities Available for Sale - Gross Unrealized Losses and Fair Value (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.quaintoak.com/20220331/role/statement-note-5-investment-securities-available-for-sale-gross-unrealized-losses-and-fair-value-details</Role>
      <ShortName>Note 5 - Investment Securities Available for Sale - Gross Unrealized Losses and Fair Value (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>41</Position>
    </Report>
    <Report instance="qnto20220331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>041 - Disclosure - Note 6 - Loans Receivable, Net and Allowance for Loan Losses (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.quaintoak.com/20220331/role/statement-note-6-loans-receivable-net-and-allowance-for-loan-losses-details-textual</Role>
      <ShortName>Note 6 - Loans Receivable, Net and Allowance for Loan Losses (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.quaintoak.com/20220331/role/statement-note-6-loans-receivable-net-and-allowance-for-loan-losses-tables</ParentRole>
      <Position>42</Position>
    </Report>
    <Report instance="qnto20220331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>042 - Disclosure - Note 6 - Loans Receivable, Net and Allowance for Loan Losses - Composition of Net Loans Receivable (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.quaintoak.com/20220331/role/statement-note-6-loans-receivable-net-and-allowance-for-loan-losses-composition-of-net-loans-receivable-details</Role>
      <ShortName>Note 6 - Loans Receivable, Net and Allowance for Loan Losses - Composition of Net Loans Receivable (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>43</Position>
    </Report>
    <Report instance="qnto20220331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>043 - Disclosure - Note 6 - Loans Receivable, Net and Allowance for Loan Losses - Loan Portfolio by Credit Rating (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.quaintoak.com/20220331/role/statement-note-6-loans-receivable-net-and-allowance-for-loan-losses-loan-portfolio-by-credit-rating-details</Role>
      <ShortName>Note 6 - Loans Receivable, Net and Allowance for Loan Losses - Loan Portfolio by Credit Rating (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>44</Position>
    </Report>
    <Report instance="qnto20220331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>044 - Disclosure - Note 6 - Loans Receivable, Net and Allowance for Loan Losses - Impaired Loans by Loan Portfolio Class (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.quaintoak.com/20220331/role/statement-note-6-loans-receivable-net-and-allowance-for-loan-losses-impaired-loans-by-loan-portfolio-class-details</Role>
      <ShortName>Note 6 - Loans Receivable, Net and Allowance for Loan Losses - Impaired Loans by Loan Portfolio Class (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>45</Position>
    </Report>
    <Report instance="qnto20220331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>045 - Disclosure - Note 6 - Loans Receivable, Net and Allowance for Loan Losses - Troubled Debt Restructuring Loans (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.quaintoak.com/20220331/role/statement-note-6-loans-receivable-net-and-allowance-for-loan-losses-troubled-debt-restructuring-loans-details</Role>
      <ShortName>Note 6 - Loans Receivable, Net and Allowance for Loan Losses - Troubled Debt Restructuring Loans (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>46</Position>
    </Report>
    <Report instance="qnto20220331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>046 - Disclosure - Note 6 - Loans Receivable, Net and Allowance for Loan Losses - Contractual Aging of the TDRs (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.quaintoak.com/20220331/role/statement-note-6-loans-receivable-net-and-allowance-for-loan-losses-contractual-aging-of-the-tdrs-details</Role>
      <ShortName>Note 6 - Loans Receivable, Net and Allowance for Loan Losses - Contractual Aging of the TDRs (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>47</Position>
    </Report>
    <Report instance="qnto20220331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>047 - Disclosure - Note 6 - Loans Receivable, Net and Allowance for Loan Losses - Changes in the Allowance for Loan Losses and Recorded Investment in Loans Receivable (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.quaintoak.com/20220331/role/statement-note-6-loans-receivable-net-and-allowance-for-loan-losses-changes-in-the-allowance-for-loan-losses-and-recorded-investment-in-loans-receivable-details</Role>
      <ShortName>Note 6 - Loans Receivable, Net and Allowance for Loan Losses - Changes in the Allowance for Loan Losses and Recorded Investment in Loans Receivable (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>48</Position>
    </Report>
    <Report instance="qnto20220331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>048 - Disclosure - Note 6 - Loans Receivable, Net and Allowance for Loan Losses - Non-accrual Loans by Class of Loans (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.quaintoak.com/20220331/role/statement-note-6-loans-receivable-net-and-allowance-for-loan-losses-nonaccrual-loans-by-class-of-loans-details</Role>
      <ShortName>Note 6 - Loans Receivable, Net and Allowance for Loan Losses - Non-accrual Loans by Class of Loans (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>49</Position>
    </Report>
    <Report instance="qnto20220331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>049 - Disclosure - Note 6 - Loans Receivable, Net and Allowance for Loan Losses - Loan Portfolio Summarized by Past Due Status (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.quaintoak.com/20220331/role/statement-note-6-loans-receivable-net-and-allowance-for-loan-losses-loan-portfolio-summarized-by-past-due-status-details</Role>
      <ShortName>Note 6 - Loans Receivable, Net and Allowance for Loan Losses - Loan Portfolio Summarized by Past Due Status (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>50</Position>
    </Report>
    <Report instance="qnto20220331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>050 - Disclosure - Note 7 - Goodwill and Other Intangible, Net (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.quaintoak.com/20220331/role/statement-note-7-goodwill-and-other-intangible-net-details-textual</Role>
      <ShortName>Note 7 - Goodwill and Other Intangible, Net (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.quaintoak.com/20220331/role/statement-note-7-goodwill-and-other-intangible-net-</ParentRole>
      <Position>51</Position>
    </Report>
    <Report instance="qnto20220331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>051 - Disclosure - Note 8 - Deposits - Summary of Deposits (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.quaintoak.com/20220331/role/statement-note-8-deposits-summary-of-deposits-details</Role>
      <ShortName>Note 8 - Deposits - Summary of Deposits (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>52</Position>
    </Report>
    <Report instance="qnto20220331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>052 - Disclosure - Note 9 - Borrowings (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.quaintoak.com/20220331/role/statement-note-9-borrowings-details-textual</Role>
      <ShortName>Note 9 - Borrowings (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.quaintoak.com/20220331/role/statement-note-9-borrowings-tables</ParentRole>
      <Position>53</Position>
    </Report>
    <Report instance="qnto20220331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>053 - Disclosure - Note 9 - Borrowings - Federal Home Loan Bank Long-term Borrowings (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.quaintoak.com/20220331/role/statement-note-9-borrowings-federal-home-loan-bank-longterm-borrowings-details</Role>
      <ShortName>Note 9 - Borrowings - Federal Home Loan Bank Long-term Borrowings (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>54</Position>
    </Report>
    <Report instance="qnto20220331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>054 - Disclosure - Note 10 - Stock Compensation Plans (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.quaintoak.com/20220331/role/statement-note-10-stock-compensation-plans-details-textual</Role>
      <ShortName>Note 10 - Stock Compensation Plans (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.quaintoak.com/20220331/role/statement-note-10-stock-compensation-plans-tables</ParentRole>
      <Position>55</Position>
    </Report>
    <Report instance="qnto20220331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>055 - Disclosure - Note 10 - Stock Compensation Plans - Status of Shares Under the RRP and Stock Incentive Plan (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.quaintoak.com/20220331/role/statement-note-10-stock-compensation-plans-status-of-shares-under-the-rrp-and-stock-incentive-plan-details</Role>
      <ShortName>Note 10 - Stock Compensation Plans - Status of Shares Under the RRP and Stock Incentive Plan (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>56</Position>
    </Report>
    <Report instance="qnto20220331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>056 - Disclosure - Note 10 - Stock Compensation Plans - Summary of Option Activity (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.quaintoak.com/20220331/role/statement-note-10-stock-compensation-plans-summary-of-option-activity-details</Role>
      <ShortName>Note 10 - Stock Compensation Plans - Summary of Option Activity (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>57</Position>
    </Report>
    <Report instance="qnto20220331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>057 - Disclosure - Note 11 - Fair Value Measurements and Fair Values of Financial Instruments - Financial Assets and Liabilities on a Recurring and Nonrecurring (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.quaintoak.com/20220331/role/statement-note-11-fair-value-measurements-and-fair-values-of-financial-instruments-financial-assets-and-liabilities-on-a-recurring-and-nonrecurring-details</Role>
      <ShortName>Note 11 - Fair Value Measurements and Fair Values of Financial Instruments - Financial Assets and Liabilities on a Recurring and Nonrecurring (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>58</Position>
    </Report>
    <Report instance="qnto20220331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>058 - Disclosure - Note 11 - Fair Value Measurements and Fair Values of Financial Instruments - Additional Quantitative Information About Assets Measured at Fair Value on a Nonrecurring Basis (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.quaintoak.com/20220331/role/statement-note-11-fair-value-measurements-and-fair-values-of-financial-instruments-additional-quantitative-information-about-assets-measured-at-fair-value-on-a-nonrecurring-basis-details</Role>
      <ShortName>Note 11 - Fair Value Measurements and Fair Values of Financial Instruments - Additional Quantitative Information About Assets Measured at Fair Value on a Nonrecurring Basis (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>59</Position>
    </Report>
    <Report instance="qnto20220331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>059 - Disclosure - Note 11 - Fair Value Measurements and Fair Values of Financial Instruments - Estimated Fair Values of Financial Instruments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.quaintoak.com/20220331/role/statement-note-11-fair-value-measurements-and-fair-values-of-financial-instruments-estimated-fair-values-of-financial-instruments-details</Role>
      <ShortName>Note 11 - Fair Value Measurements and Fair Values of Financial Instruments - Estimated Fair Values of Financial Instruments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>60</Position>
    </Report>
    <Report instance="qnto20220331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>060 - Disclosure - Note 12 - Operating Segments (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.quaintoak.com/20220331/role/statement-note-12-operating-segments-details-textual</Role>
      <ShortName>Note 12 - Operating Segments (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.quaintoak.com/20220331/role/statement-note-12-operating-segments-tables</ParentRole>
      <Position>61</Position>
    </Report>
    <Report instance="qnto20220331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>061 - Disclosure - Note 12 - Operating Segments - Summary of Financial Information for the Reportable Segments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.quaintoak.com/20220331/role/statement-note-12-operating-segments-summary-of-financial-information-for-the-reportable-segments-details</Role>
      <ShortName>Note 12 - Operating Segments - Summary of Financial Information for the Reportable Segments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>62</Position>
    </Report>
    <Report instance="qnto20220331_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R63.htm</HtmlFileName>
      <LongName>062 - Disclosure - Note 13 - Subsequent Event (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.quaintoak.com/20220331/role/statement-note-13-subsequent-event-details-textual</Role>
      <ShortName>Note 13 - Subsequent Event (Details Textual)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.quaintoak.com/20220331/role/statement-note-13-subsequent-event</ParentRole>
      <Position>63</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-Q" original="qnto20220331_10q.htm">qnto20220331_10q.htm</File>
    <File>ex_370968.htm</File>
    <File>ex_370969.htm</File>
    <File>ex_370970.htm</File>
    <File>qnto-20220331.xsd</File>
    <File>qnto-20220331_cal.xml</File>
    <File>qnto-20220331_def.xml</File>
    <File>qnto-20220331_lab.xml</File>
    <File>qnto-20220331_pre.xml</File>
  </InputFiles>
  <SupplementalFiles/>
  <BaseTaxonomies>
    <BaseTaxonomy items="1538">http://fasb.org/us-gaap/2022</BaseTaxonomy>
    <BaseTaxonomy items="26">http://xbrl.sec.gov/dei/2022</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
