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Note 6 - Renewable Energy Tax Credit Investment (Details Textual) $ in Millions	Jun. 30, 2023 USD ($)
Financial Standby Letter of Credit [Member]
Guarantor Obligations, Maximum Exposure, Undiscounted	$ 2.0
Investment Tax Credit Carryforward [Member]
Tax Credit, Committed Investment in the Tax Credit Producing Entity	2.0
Tax Credit, Unfunded Commitment	$ 1.9

X

- Definition

Represents the Committed Investment in the Tax Credit Producing Entity

+ References

No definition available.

+ Details

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

X

- Definition

Amount of unfunded commitment for tax credit.

+ References

No definition available.

+ Details

Name:	fcap_TaxCreditUnfundedCommitment
Namespace Prefix:	fcap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 460
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482425/460-10-50-4

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_GuaranteeObligationsByNatureAxis=us-gaap_FinancialStandbyLetterOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_TaxCreditCarryforwardAxis=us-gaap_InvestmentCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: