OTHER INVESTMENTS (Details Textual) - USD ($)	3 Months Ended			9 Months Ended
OTHER INVESTMENTS (Details Textual) - USD ($)	Sep. 30, 2021	Sep. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2017	Sep. 30, 2015
Other Investment [Line Items]
Other Investments	$ 4,848,153			$ 4,848,153		$ 4,940,403
Company committed to fund approximately as required by agreements with the investees	1,000,000.00			1,000,000.00
Proceeds from Sale and Maturity of Other Investments				1,034,222	$ 597,668
Payments to Acquire Other Investments				503,601	227,268
Marketable Securities, Unrealized Gain (Loss), Total	6,000	$ 128,000		250,000	(186,000)
Marketable Securities	2,814,927			2,814,927		$ 3,406,328
Impairment of Other Investments	0	0		0	315,000
Asia [Member] \| Real Estate [Member]
Other Investment [Line Items]
Proceeds from Sale and Maturity of Other Investments				129,000
Small Business Administration [Member]
Other Investment [Line Items]
Other Investments							$ 300,000
Impairment of Other Investments		90,000	$ 50,000		315,000
Income from Other Investments					68,000
Investments After Other Than Temporary Impairment Adjustments					92,000
Global Fund Investment Relating To Oil Exploration And Production [Member]
Other Investment [Line Items]
Other Investments	2,000,000,000			2,000,000,000
Company committed to fund approximately as required by agreements with the investees								$ 500,000
Impairment of Other Investments		$ 175,000
Income from Other Investments					$ 205,000
New Private Equity Fund [Member]
Other Investment [Line Items]
Company committed to fund approximately as required by agreements with the investees	500,000			500,000
Income from Other Investments				137,000
Freely Marketable [Member] \| Investment In Insurance Company [Member]
Other Investment [Line Items]
Maketable securitites unrealised loss position	$ 504,000			$ 504,000
TGIF Texas Inc [Member]
Other Investment [Line Items]
Equity Method Investment, Ownership Percentage	49.00%			49.00%
Multifamily Residential Property [Member] \| Orlando Florida [Member]
Other Investment [Line Items]
Gain losses on sales of investment real estate				$ 315,000
Mortgage Loans [Member]
Other Investment [Line Items]
Proceeds from Sale and Maturity of Other Investments				584,000
HMG Mortgage Loans [Member]
Other Investment [Line Items]
Proceeds from Sale and Maturity of Other Investments				78,000
Miscellaneous Investments [Member]
Other Investment [Line Items]
Proceeds from Sale and Maturity of Other Investments				243,000
Investments in Private Bank [Member] \| Palm Beach (Florida) [Member]
Other Investment [Line Items]
Marketable Securities, Unrealized Gain (Loss), Total				128,000
Marketable Securities	$ 35,000			35,000
Existing investments [Member]
Other Investment [Line Items]
Income from Other Investments				67,000
Real Estate Partnership [Member]
Other Investment [Line Items]
Payments to Acquire Other Investments				200,000
New Co Investment [Member]
Other Investment [Line Items]
Payments to Acquire Other Investments				50,000
Start Up Technology Fund [Member]
Other Investment [Line Items]
Payments to Acquire Other Investments				$ 50,000

HMG COURTLAND PROPERTIES INC 10-Q