<?xml version='1.0' encoding='UTF-8'?>
<FilingSummary>
  <Version>3.5.0.2</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>491</ContextCount>
  <ElementCount>320</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>false</FootnotesReported>
  <SegmentCount>77</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>4</UnitCount>
  <MyReports>
    <Report instance="fcap-20160630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>000 - Document - Document And Entity Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.firstharrison.com/20160630/role/statement-document-and-entity-information</Role>
      <ShortName>Document And Entity Information</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="fcap-20160630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>001 - Statement - Consolidated Balance Sheets (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.firstharrison.com/20160630/role/statement-consolidated-balance-sheets-unaudited</Role>
      <ShortName>Consolidated Balance Sheets (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="fcap-20160630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>002 - Statement - Consolidated Balance Sheets (Unaudited) (Parentheticals)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.firstharrison.com/20160630/role/statement-consolidated-balance-sheets-unaudited-parentheticals</Role>
      <ShortName>Consolidated Balance Sheets (Unaudited) (Parentheticals)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="fcap-20160630.xml">
      <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.firstharrison.com/20160630/role/statement-consolidated-statements-of-income-unaudited</Role>
      <ShortName>Consolidated Statements of Income (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="fcap-20160630.xml">
      <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.firstharrison.com/20160630/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="fcap-20160630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>005 - Statement - Consolidated Statements of Changes in Stockholders' Equity (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.firstharrison.com/20160630/role/statement-consolidated-statements-of-changes-in-stockholders-equity-unaudited</Role>
      <ShortName>Consolidated Statements of Changes in Stockholders' Equity (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="fcap-20160630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>006 - Statement - Consolidated Statements of Cash Flows (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.firstharrison.com/20160630/role/statement-consolidated-statements-of-cash-flows-unaudited</Role>
      <ShortName>Consolidated Statements of Cash Flows (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="fcap-20160630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>007 - Disclosure - Note 1 - Presentation of Interim Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.firstharrison.com/20160630/role/statement-note-1-presentation-of-interim-information</Role>
      <ShortName>Note 1 - Presentation of Interim Information</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="fcap-20160630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>008 - Disclosure - Note 2 - Acquisition of Peoples Bancorp, Inc. of Bullitt County</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.firstharrison.com/20160630/role/statement-note-2-acquisition-of-peoples-bancorp-inc-of-bullitt-county</Role>
      <ShortName>Note 2 - Acquisition of Peoples Bancorp, Inc. of Bullitt County</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="fcap-20160630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>009 - Disclosure - Note 3 - Investment Securities</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.firstharrison.com/20160630/role/statement-note-3-investment-securities</Role>
      <ShortName>Note 3 - Investment Securities</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="fcap-20160630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>010 - Disclosure - Note 4 - Loans and Allowance for Loan Losses</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.firstharrison.com/20160630/role/statement-note-4-loans-and-allowance-for-loan-losses</Role>
      <ShortName>Note 4 - Loans and Allowance for Loan Losses</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="fcap-20160630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>011 - Disclosure - Note 5 - Supplemental Disclosure for Earnings Per Share</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.firstharrison.com/20160630/role/statement-note-5-supplemental-disclosure-for-earnings-per-share</Role>
      <ShortName>Note 5 - Supplemental Disclosure for Earnings Per Share</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="fcap-20160630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>012 - Disclosure - Note 6 - Stock Option Plan</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.firstharrison.com/20160630/role/statement-note-6-stock-option-plan</Role>
      <ShortName>Note 6 - Stock Option Plan</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="fcap-20160630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>013 - Disclosure - Note 7 - Supplemental Disclosures of Cash Flow Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.firstharrison.com/20160630/role/statement-note-7-supplemental-disclosures-of-cash-flow-information</Role>
      <ShortName>Note 7 - Supplemental Disclosures of Cash Flow Information</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="fcap-20160630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>014 - Disclosure - Note 8 - Fair Value Measurements</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.firstharrison.com/20160630/role/statement-note-8-fair-value-measurements</Role>
      <ShortName>Note 8 - Fair Value Measurements</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="fcap-20160630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>015 - Document - Note 9 - Recent Accounting Pronouncements</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.firstharrison.com/20160630/role/statement-note-9-recent-accounting-pronouncements</Role>
      <ShortName>Note 9 - Recent Accounting Pronouncements</ShortName>
      <MenuCategory>Uncategorized</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="fcap-20160630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>016 - Disclosure - Note 3 - Investment Securities (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.firstharrison.com/20160630/role/statement-note-3-investment-securities-tables</Role>
      <ShortName>Note 3 - Investment Securities (Tables)</ShortName>
      <MenuCategory>Uncategorized</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="fcap-20160630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>017 - Disclosure - Note 4 - Loans and Allowance for Loan Losses (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.firstharrison.com/20160630/role/statement-note-4-loans-and-allowance-for-loan-losses-tables</Role>
      <ShortName>Note 4 - Loans and Allowance for Loan Losses (Tables)</ShortName>
      <MenuCategory>Uncategorized</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="fcap-20160630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>018 - Disclosure - Note 5 - Supplemental Disclosure for Earnings Per Share (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.firstharrison.com/20160630/role/statement-note-5-supplemental-disclosure-for-earnings-per-share-tables</Role>
      <ShortName>Note 5 - Supplemental Disclosure for Earnings Per Share (Tables)</ShortName>
      <MenuCategory>Uncategorized</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="fcap-20160630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>019 - Disclosure - Note 6 - Stock Option Plan (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.firstharrison.com/20160630/role/statement-note-6-stock-option-plan-tables</Role>
      <ShortName>Note 6 - Stock Option Plan (Tables)</ShortName>
      <MenuCategory>Uncategorized</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="fcap-20160630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>020 - Disclosure - Note 7 - Supplemental Disclosures of Cash Flow Information (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.firstharrison.com/20160630/role/statement-note-7-supplemental-disclosures-of-cash-flow-information-tables</Role>
      <ShortName>Note 7 - Supplemental Disclosures of Cash Flow Information (Tables)</ShortName>
      <MenuCategory>Uncategorized</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="fcap-20160630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>021 - Disclosure - Note 8 - Fair Value Measurements (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.firstharrison.com/20160630/role/statement-note-8-fair-value-measurements-tables</Role>
      <ShortName>Note 8 - Fair Value Measurements (Tables)</ShortName>
      <MenuCategory>Uncategorized</MenuCategory>
      <Position>22</Position>
    </Report>
    <Report instance="fcap-20160630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>022 - Disclosure - Note 1 - Presentation of Interim Information (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.firstharrison.com/20160630/role/statement-note-1-presentation-of-interim-information-details-textual</Role>
      <ShortName>Note 1 - Presentation of Interim Information (Details Textual)</ShortName>
      <MenuCategory>Uncategorized</MenuCategory>
      <Position>23</Position>
    </Report>
    <Report instance="fcap-20160630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>023 - Disclosure - Note 2 - Acquisition of Peoples Bancorp, Inc. of Bullitt County (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.firstharrison.com/20160630/role/statement-note-2-acquisition-of-peoples-bancorp-inc-of-bullitt-county-details-textual</Role>
      <ShortName>Note 2 - Acquisition of Peoples Bancorp, Inc. of Bullitt County (Details Textual)</ShortName>
      <MenuCategory>Uncategorized</MenuCategory>
      <Position>24</Position>
    </Report>
    <Report instance="fcap-20160630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>024 - Disclosure - Note 3 - Investment Securities (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.firstharrison.com/20160630/role/statement-note-3-investment-securities-details-textual</Role>
      <ShortName>Note 3 - Investment Securities (Details Textual)</ShortName>
      <MenuCategory>Uncategorized</MenuCategory>
      <Position>25</Position>
    </Report>
    <Report instance="fcap-20160630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>025 - Disclosure - Note 3 - Investment Securities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.firstharrison.com/20160630/role/statement-note-3-investment-securities-details</Role>
      <ShortName>Note 3 - Investment Securities (Details)</ShortName>
      <MenuCategory>Uncategorized</MenuCategory>
      <Position>26</Position>
    </Report>
    <Report instance="fcap-20160630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>026 - Disclosure - Note 3 - Amortized Cost and Fair Value of Debt Securities by Contractual Maturity (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.firstharrison.com/20160630/role/statement-note-3-amortized-cost-and-fair-value-of-debt-securities-by-contractual-maturity-details</Role>
      <ShortName>Note 3 - Amortized Cost and Fair Value of Debt Securities by Contractual Maturity (Details)</ShortName>
      <MenuCategory>Uncategorized</MenuCategory>
      <Position>27</Position>
    </Report>
    <Report instance="fcap-20160630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>027 - Disclosure - Note 3 - Investment Securities Available for Sale (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.firstharrison.com/20160630/role/statement-note-3-investment-securities-available-for-sale-details</Role>
      <ShortName>Note 3 - Investment Securities Available for Sale (Details)</ShortName>
      <MenuCategory>Uncategorized</MenuCategory>
      <Position>28</Position>
    </Report>
    <Report instance="fcap-20160630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>028 - Disclosure - Note 4 - Loans and Allowance for Loan Losses (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.firstharrison.com/20160630/role/statement-note-4-loans-and-allowance-for-loan-losses-details-textual</Role>
      <ShortName>Note 4 - Loans and Allowance for Loan Losses (Details Textual)</ShortName>
      <MenuCategory>Uncategorized</MenuCategory>
      <Position>29</Position>
    </Report>
    <Report instance="fcap-20160630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>029 - Disclosure - Note 4 - Loans (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.firstharrison.com/20160630/role/statement-note-4-loans-details</Role>
      <ShortName>Note 4 - Loans (Details)</ShortName>
      <MenuCategory>Uncategorized</MenuCategory>
      <Position>30</Position>
    </Report>
    <Report instance="fcap-20160630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>030 - Disclosure - Note 4 - Recorded Investments in Loans (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.firstharrison.com/20160630/role/statement-note-4-recorded-investments-in-loans-details</Role>
      <ShortName>Note 4 - Recorded Investments in Loans (Details)</ShortName>
      <MenuCategory>Uncategorized</MenuCategory>
      <Position>31</Position>
    </Report>
    <Report instance="fcap-20160630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>031 - Disclosure - Note 4 - Allowance for Loan Losses (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.firstharrison.com/20160630/role/statement-note-4-allowance-for-loan-losses-details</Role>
      <ShortName>Note 4 - Allowance for Loan Losses (Details)</ShortName>
      <MenuCategory>Uncategorized</MenuCategory>
      <Position>32</Position>
    </Report>
    <Report instance="fcap-20160630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>032 - Disclosure - Note 4 - Impaired Loans (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.firstharrison.com/20160630/role/statement-note-4-impaired-loans-details</Role>
      <ShortName>Note 4 - Impaired Loans (Details)</ShortName>
      <MenuCategory>Uncategorized</MenuCategory>
      <Position>33</Position>
    </Report>
    <Report instance="fcap-20160630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>033 - Disclosure - Note 4 - Recorded Investment in Nonperforming Loans (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.firstharrison.com/20160630/role/statement-note-4-recorded-investment-in-nonperforming-loans-details</Role>
      <ShortName>Note 4 - Recorded Investment in Nonperforming Loans (Details)</ShortName>
      <MenuCategory>Uncategorized</MenuCategory>
      <Position>34</Position>
    </Report>
    <Report instance="fcap-20160630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>034 - Disclosure - Note 4 - Aging of Recorded Investment in Loans (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.firstharrison.com/20160630/role/statement-note-4-aging-of-recorded-investment-in-loans-details</Role>
      <ShortName>Note 4 - Aging of Recorded Investment in Loans (Details)</ShortName>
      <MenuCategory>Uncategorized</MenuCategory>
      <Position>35</Position>
    </Report>
    <Report instance="fcap-20160630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>035 - Disclosure - Note 4 - Recorded Investment in Loans by Risk Category (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.firstharrison.com/20160630/role/statement-note-4-recorded-investment-in-loans-by-risk-category-details</Role>
      <ShortName>Note 4 - Recorded Investment in Loans by Risk Category (Details)</ShortName>
      <MenuCategory>Uncategorized</MenuCategory>
      <Position>36</Position>
    </Report>
    <Report instance="fcap-20160630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>036 - Disclosure - Note 4 - Troubled Debt Restructuring by Accrual Status (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.firstharrison.com/20160630/role/statement-note-4-troubled-debt-restructuring-by-accrual-status-details</Role>
      <ShortName>Note 4 - Troubled Debt Restructuring by Accrual Status (Details)</ShortName>
      <MenuCategory>Uncategorized</MenuCategory>
      <Position>37</Position>
    </Report>
    <Report instance="fcap-20160630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>037 - Disclosure - Note 4 - Summary of PCI Loans (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.firstharrison.com/20160630/role/statement-note-4-summary-of-pci-loans-details</Role>
      <ShortName>Note 4 - Summary of PCI Loans (Details)</ShortName>
      <MenuCategory>Uncategorized</MenuCategory>
      <Position>38</Position>
    </Report>
    <Report instance="fcap-20160630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>038 - Disclosure - Note 4 - Accretable Yield, or Income Expected to be Collected (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.firstharrison.com/20160630/role/statement-note-4-accretable-yield-or-income-expected-to-be-collected-details</Role>
      <ShortName>Note 4 - Accretable Yield, or Income Expected to be Collected (Details)</ShortName>
      <MenuCategory>Uncategorized</MenuCategory>
      <Position>39</Position>
    </Report>
    <Report instance="fcap-20160630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>039 - Disclosure - Note 5 - Earnings Per Share (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.firstharrison.com/20160630/role/statement-note-5-earnings-per-share-details</Role>
      <ShortName>Note 5 - Earnings Per Share (Details)</ShortName>
      <MenuCategory>Uncategorized</MenuCategory>
      <Position>40</Position>
    </Report>
    <Report instance="fcap-20160630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>040 - Disclosure - Note 6 - Stock Option Plan (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.firstharrison.com/20160630/role/statement-note-6-stock-option-plan-details-textual</Role>
      <ShortName>Note 6 - Stock Option Plan (Details Textual)</ShortName>
      <MenuCategory>Uncategorized</MenuCategory>
      <Position>41</Position>
    </Report>
    <Report instance="fcap-20160630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>041 - Disclosure - Note 6 - Nonvested Restricted Shares Activity (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.firstharrison.com/20160630/role/statement-note-6-nonvested-restricted-shares-activity-details</Role>
      <ShortName>Note 6 - Nonvested Restricted Shares Activity (Details)</ShortName>
      <MenuCategory>Uncategorized</MenuCategory>
      <Position>42</Position>
    </Report>
    <Report instance="fcap-20160630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>042 - Disclosure - Note 7 - Supplemental Disclosures of Cash Flow Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.firstharrison.com/20160630/role/statement-note-7-supplemental-disclosures-of-cash-flow-information-details</Role>
      <ShortName>Note 7 - Supplemental Disclosures of Cash Flow Information (Details)</ShortName>
      <MenuCategory>Uncategorized</MenuCategory>
      <Position>43</Position>
    </Report>
    <Report instance="fcap-20160630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>043 - Disclosure - Note 8 - Fair Value Measurements (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.firstharrison.com/20160630/role/statement-note-8-fair-value-measurements-details-textual</Role>
      <ShortName>Note 8 - Fair Value Measurements (Details Textual)</ShortName>
      <MenuCategory>Uncategorized</MenuCategory>
      <Position>44</Position>
    </Report>
    <Report instance="fcap-20160630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>044 - Disclosure - Note 8 - Assets Measured at Fair Value on Recurring and Nonrecurring Basis (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.firstharrison.com/20160630/role/statement-note-8-assets-measured-at-fair-value-on-recurring-and-nonrecurring-basis-details</Role>
      <ShortName>Note 8 - Assets Measured at Fair Value on Recurring and Nonrecurring Basis (Details)</ShortName>
      <MenuCategory>Uncategorized</MenuCategory>
      <Position>45</Position>
    </Report>
    <Report instance="fcap-20160630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>045 - Disclosure - Note 8 - Carrying Value and Estimated Fair Value of Financial Instruments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.firstharrison.com/20160630/role/statement-note-8-carrying-value-and-estimated-fair-value-of-financial-instruments-details</Role>
      <ShortName>Note 8 - Carrying Value and Estimated Fair Value of Financial Instruments (Details)</ShortName>
      <MenuCategory>Uncategorized</MenuCategory>
      <Position>46</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <InputFiles>
    <File>fcap-20160630.xml</File>
    <File>fcap-20160630.xsd</File>
    <File>fcap-20160630_cal.xml</File>
    <File>fcap-20160630_def.xml</File>
    <File>fcap-20160630_lab.xml</File>
    <File>fcap-20160630_pre.xml</File>
  </InputFiles>
  <SupplementalFiles/>
  <BaseTaxonomies/>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
