Represents adjusted capital.

No definition available.

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Namespace Prefix:	icch_
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Balance Type:	credit
Period Type:	instant

- Definition

Represents debt covenant adjusted capital.

+ References

No definition available.

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Namespace Prefix:	icch_
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Balance Type:	credit
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- Definition

Represents line of credit facility maximum borrowing capacity percent.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	instant

- Definition

Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages.

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-Name Accounting Standards Codification
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Period Type:	instant

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

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Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of assets pledged to secure a debt instrument.

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-Section 50
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

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

+ References

No definition available.

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Balance Type:	na
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- Definition

Indicates type of variable interest rate on debt instrument.

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- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

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Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of maximum advances or credit lines available from the Federal Home Loan Bank (FHLB).

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Balance Type:	credit
Period Type:	instant

- Definition

Amount of interest expense classified as operating and nonoperating. Includes, but is not limited to, cost of borrowing accounted for as interest expense.

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Period Type:	duration

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

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Balance Type:	credit
Period Type:	instant

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

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

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Balance Type:
Period Type:

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=icch_AmericanBankTrustMember
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- Details

Name:	srt_FederalHomeLoanBankAdvancesBranchOfFHLBBankAxis=srt_FederalHomeLoanBankOfChicagoMember
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Note 4 - Debt (Details Textual) - USD ($)		3 Months Ended
Note 4 - Debt (Details Textual) - USD ($)	Jul. 05, 2023	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Long-Term Debt		$ 15,000,000		$ 15,000,000
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]	Prime Rate [Member]
Minimum [Member]
Adjusted Capital		65,400,000
Revolving Credit Facility [Member] \| Quad City Bank & Trust [Member]
Debt Instrument, Collateral Amount		4,000,000
Long-Term Line of Credit, Total		0
Debt Instrument, Basis Spread on Variable Rate	0.50%
Line of Credit Facility, Maximum Borrowing Capacity		4,000,000
Debt Covenant Adjusted Capital		21,000,000
Revolving Credit Facility [Member] \| Quad City Bank & Trust [Member] \| Minimum [Member]
Debt Instrument, Basis Spread on Variable Rate	6.00%
Revolving Credit Facility [Member] \| American Bank & Trust [Member]
Interest Expense, Operating and Nonoperating		0	$ 0
Federal Home Loan Bank of Chicago [Member]
Federal Home Loan Bank, Advances, General Debt Obligations, Maximum Amount Available		$ 48,200,000
Line of Credit Facility Maximum Borrowing Capacity Percent		25.00%
Advance from Federal Home Loan Bank		$ 15,000,000
Debt Instrument, Term (Year)		5 years
Debt, Weighted Average Interest Rate		1.21%
Debt Instrument, Collateral Amount		$ 19,100,000