Note 20 - Disclosures About Fair Value of Financial Instruments - Carrying Value and Estimated Fair Value of Financial Instruments (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Securities available for sale, fair value	$ 254,562,000	$ 261,841,000
Equity securities (included in other assets)	1,700,000	1,700,000
Reported Value Measurement [Member]
Cash and cash equivalents	51,360,000	41,112,000
Interest-bearing time deposits	6,490,000	7,710,000
Securities available for sale, fair value	254,562,000	261,841,000
Loans held for sale	4,176,000	2,849,000
Loans, net	466,694,000	434,260,000
FHLB and other restricted stock	1,988,000	1,988,000
Accrued interest receivable	3,076,000	2,828,000
Equity securities (included in other assets)	1,746,000	1,715,000
Deposits	722,177,000	701,646,000
Accrued interest payable	210,000	150,000
Estimate of Fair Value Measurement [Member]
Cash and cash equivalents	51,360,000	41,112,000
Interest-bearing time deposits	6,654,000	7,650,000
Securities available for sale, fair value	254,562,000	261,841,000
Loans held for sale	4,243,000	2,900,000
Loans, net	482,119,000	427,200,000
FHLB and other restricted stock
Accrued interest receivable	3,076,000	2,828,000
Equity securities (included in other assets)	1,746,000	1,715,000
Deposits	721,729,000	699,864,000
Accrued interest payable	210,000	150,000
Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 1 [Member]
Cash and cash equivalents	51,360,000	41,112,000
Interest-bearing time deposits
Securities available for sale, fair value
Loans held for sale
Loans, net
FHLB and other restricted stock
Accrued interest receivable
Equity securities (included in other assets)	1,746,000	1,715,000
Deposits
Accrued interest payable
Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 2 [Member]
Cash and cash equivalents
Interest-bearing time deposits	6,654,000	7,650,000
Securities available for sale, fair value	254,562,000	261,841,000
Loans held for sale	4,243,000	2,900,000
Loans, net
FHLB and other restricted stock
Accrued interest receivable	3,076,000	2,828,000
Equity securities (included in other assets)
Deposits
Accrued interest payable	210,000	150,000
Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 3 [Member]
Cash and cash equivalents
Interest-bearing time deposits
Securities available for sale, fair value
Loans held for sale
Loans, net	482,119,000	427,200,000
FHLB and other restricted stock
Accrued interest receivable
Equity securities (included in other assets)
Deposits	721,729,000	699,864,000
Accrued interest payable

Represents the fair value of accrued interest receivable.

No definition available.

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

- Definition

Represents the fair value of interest payable.

+ References

No definition available.

+ Details

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

- Definition

Fair value portion of interest-bearing deposits in other financial institutions for relatively short periods of time including, for example, certificates of deposits, which are presented separately from cash on the balance sheet.

+ References

No definition available.

+ Details

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

- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

No definition available.

+ Details

Name:	us-gaap_AvailableForSaleSecurities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

+ References

No definition available.

+ Details

Name:	us-gaap_CashAndCashEquivalentsFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Fair value portion of deposit liabilities held by the entity, including, but not limited to, foreign and domestic, interest and noninterest bearing, demand deposits, saving deposits, negotiable orders of withdrawal (NOW) and time deposits.

+ References

No definition available.

+ Details

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

- Definition

Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=99377092&loc=SL75136599-209740

+ Details

Name:	us-gaap_EquitySecuritiesFvNi
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Fair value portion of investments in Federal Home Loan Bank (FHLBank) stock.

+ References

No definition available.

+ Details

Name:	us-gaap_InvestmentInFederalHomeLoanBankStockFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Fair value portion of loans held-for-sale including, but not limited to, mortgage loans and finance receivables.

+ References

No definition available.

+ Details

Name:	us-gaap_LoansHeldForSaleFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-URI http://asc.fasb.org/subtopic&trid=2196772

+ Details

Name:	us-gaap_LoansReceivableFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	us-gaap_FairValueByMeasurementBasisAxis=us-gaap_CarryingReportedAmountFairValueDisclosureMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByMeasurementBasisAxis=us-gaap_EstimateOfFairValueFairValueDisclosureMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: