REVENUE RECOGNITION - Major Good or Service (Details) - USD ($)	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018
Revenues
Lease Revenue	$ 10,920,000	$ 9,389,000
Lease Incentive Amortization	$ (76,000)	(76,000)
Interest from Commercial Loan Investments		301,000
Type of revenue	cto:ImpactFeeAndMitigationCreditSalesMember
Interest and Other Revenue	$ 30,000	27,000
Total Revenues	14,259,319	23,497,243
Lease Revenue - Base Rent
Revenues
Lease Revenue	8,902,000	7,433,000
Lease Revenue - CAM
Revenues
Lease Revenue	670,000	614,000
Lease Revenue - Reimbursements
Revenues
Lease Revenue	546,000	565,000
Lease Revenue - Billboards
Revenues
Lease Revenue	36,000	64,000
Above / Below Market Lease Accretion
Revenues
Lease Revenue	581,000	580,000
Contributed Leased Assets Accretion
Revenues
Lease Revenue	62,000	10,000
Land
Revenues
Revenue from contract with customer, including assessed tax	3,300,000	13,117,000
Impact Fee and Mitigation Credit Sales
Revenues
Revenue from contract with customer, including assessed tax		116,000
Subsurface Lease Revenue
Revenues
Revenue from contract with customer, including assessed tax	199,000	199,000
Subsurface Revenue - Other
Revenues
Revenue from contract with customer, including assessed tax	9,000	547,000
Income Properties
Revenues
Lease Revenue	10,694,000	9,179,000
Lease Incentive Amortization	(76,000)	(76,000)
Interest and Other Revenue	30,000	27,000
Total Revenues	10,724,418	9,205,727
Income Properties \| Lease Revenue - Base Rent
Revenues
Lease Revenue	8,875,000	7,422,000
Income Properties \| Lease Revenue - CAM
Revenues
Lease Revenue	670,000	614,000
Income Properties \| Lease Revenue - Reimbursements
Revenues
Lease Revenue	546,000	565,000
Income Properties \| Lease Revenue - Billboards
Revenues
Lease Revenue	36,000	64,000
Income Properties \| Above / Below Market Lease Accretion
Revenues
Lease Revenue	581,000	580,000
Income Properties \| Contributed Leased Assets Accretion
Revenues
Lease Revenue	62,000	10,000
Commercial Loan Investments
Revenues
Interest from Commercial Loan Investments		301,000
Total Revenues		300,999
Real Estate Operations
Revenues
Lease Revenue	226,000	210,000
Revenue from contract with customer, including assessed tax	3,534,901	13,990,517
Total Revenues	3,534,901	13,990,517
Real Estate Operations \| Lease Revenue - Base Rent
Revenues
Lease Revenue	27,000	11,000
Real Estate Operations \| Land
Revenues
Revenue from contract with customer, including assessed tax	3,300,000	13,117,000
Real Estate Operations \| Impact Fee and Mitigation Credit Sales
Revenues
Revenue from contract with customer, including assessed tax		116,000
Real Estate Operations \| Subsurface Lease Revenue
Revenues
Revenue from contract with customer, including assessed tax	199,000	199,000
Real Estate Operations \| Subsurface Revenue - Other
Revenues
Revenue from contract with customer, including assessed tax	$ 9,000	$ 547,000

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Amount of amortization of lease incentive costs incurred by the lessor for the benefit of the lessee.

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Interest and fee income related to commercial loans including industrial and agricultural, real estate (commercial and residential, construction and development), trade financing, and lease financing.

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Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

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