Debt instrument maturity date from initial date.

No definition available.

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Namespace Prefix:	chci_
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Balance Type:	na
Period Type:	duration

- Definition

Debt instrument reduced carrying value.

+ References

No definition available.

+ Details

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Namespace Prefix:	chci_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Percentage of membership interest.

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

Number of shares issued for each share of convertible preferred stock that is converted.

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Balance Type:	na
Period Type:	instant

- Definition

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

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

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

- Definition

The average effective interest rate during the reporting period.

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Period Type:	duration

- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Period Type:	instant

- Definition

Amount of the required periodic payments applied to interest.

+ References

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- 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.

+ Details

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- 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

+ Details

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

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- 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 of the required periodic payment applied to principal.

+ References

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer.

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Balance Type:	credit
Period Type:	instant

- Definition

Sum of the carrying values as of the balance sheet date of the portions of long-term notes payable due within one year or the operating cycle if longer.

+ References

+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

The per share liquidation preference (or restrictions) of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share.

+ References

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- Definition

Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer.

+ References

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- Definition

The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

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- Details

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- Details

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- Details

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- Details

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Period Type:

- Details

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- Details

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- Details

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Debt - Additional Information (Detail) - USD ($)				3 Months Ended		6 Months Ended		12 Months Ended
Debt - Additional Information (Detail) - USD ($)	Mar. 19, 2020	May 23, 2018	Oct. 17, 2014	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020	Mar. 27, 2020	Dec. 18, 2014
Line of Credit Facility [Line Items]
Unsecured financing				$ 48,000		$ 48,000		$ 5,000
Total notes payable				$ 5,548,000		$ 5,548,000		$ 5,505,000
Redeemable Series C Preferred Stock
Line of Credit Facility [Line Items]
Preferred stock, par value (in dollars per share)				$ 0.01		$ 0.01		$ 0.01
CDS \| Revolving Capital Line of Credit Agreement \| Revolving Credit Facility
Line of Credit Facility [Line Items]
Debt instrument term (in years)	5 years
Maximum borrowing capacity	$ 10,000,000.0
Debt instrument maturity date from initial date	12 months
Capital line of credit borrowed									$ 5,500,000
Effective interest rate				4.25%		4.25%		4.25%
Principal payments to CGF				$ 0		$ 0
Comstock Growth Fund
Line of Credit Facility [Line Items]
Interest payments				59,000	$ 77,000	$ 116,000	$ 226,000
WSJ Prime Rate \| Revolving Capital Line of Credit Agreement \| Revolving Credit Facility
Line of Credit Facility [Line Items]
Debt instrument spread variable rate	1.00%
Unsecured Debt
Line of Credit Facility [Line Items]
Debt instrument term (in years)						1 year
Unsecured financing				$ 48,000		$ 48,000
Interest rate for period						2.40%		3.30%
Unsecured Promissory Note \| Comstock Growth Fund
Line of Credit Facility [Line Items]
Debt instrument term (in years)			3 years
Maximum borrowing capacity			$ 20,000,000.0							$ 25,000,000
Total notes payable			$ 10,000,000.0
Unsecured Promissory Note \| Comstock Growth Fund \| Membership Exchange Agreement
Line of Credit Facility [Line Items]
Credit facility outstanding		$ 7,700,000
Percentage of membership interest		91.50%
Debt instrument reduction		$ 5,700,000
Repayments of debt					$ 5,700,000	$ 5,700,000
Unsecured Promissory Note \| Comstock Growth Fund \| Membership Exchange Agreement \| Series C Non-Convertible Preferred Stock
Line of Credit Facility [Line Items]
Convertible preferred shares issued upon conversion (in shares)		1,482,300
Preferred stock, par value (in dollars per share)		$ 0.01
Unsecured Promissory Note \| Comstock Growth Fund \| Membership Exchange Agreement \| Redeemable Series C Preferred Stock
Line of Credit Facility [Line Items]
Preferred stock liquidation value (in dollars per share)		$ 5.00