Note 1 - Summary of Significant Accounting Policies (Details Textual)	12 Months Ended
Dec. 31, 2021 USD ($)
Loan Payments Delinquency Period Beyond Which Loan is Considered Past Due (Day)	90 days
Nonaccrual Loans Performance Period (Month)	6 months
Collateral Dependent Loans, Value of Significant Properties	$ 200,000
Bank Overdrafts [Member]
Financing Receivable, Threshold Period Past Due, Writeoff (Day)	45 days
Consumer Portfolio Segment [Member]
Financing Receivable, Threshold Period Past Due, Writeoff (Day)	90 days
Maximum [Member]
Maturity of Time Deposits (Day)	90 days

Represents the collateral dependent loans value of significant properties.

No definition available.

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Namespace Prefix:	fcap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Represents the loan payments delinquency period beyond which a loan is considered past-due.

+ References

No definition available.

+ Details

Name:	fcap_LoanPaymentsDelinquencyPeriodBeyondWhichLoanIsConsideredPastDue
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Balance Type:	na
Period Type:	duration

- Definition

Period of time that a borrower must demonstrate the ability to make future payments of principal and interest as scheduled to have a loan restored to accrual status.

+ References

No definition available.

+ Details

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Namespace Prefix:	fcap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Threshold period for when financing receivable is considered past due to write off as uncollectible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 14
-URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919253-210447

+ Details

Name:	us-gaap_FinancingReceivableThresholdPeriodPastDueWriteoff
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

- Definition

Period of time between issuance and maturity of customer deposits, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher SEC
-Name Industry Guide
-Number 3
-Section V
-Paragraph D-E

+ Details

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- Details

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- Details

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Namespace Prefix:
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- Details

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