REVENUE RECOGNITION - Major Good or Service (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenues
Lease revenue	$ 9,676,000		$ 29,604,000
Lease Incentive Amortization	(76,000)	$ (76,000)	(227,000)	$ (227,000)
Interest from Commercial Loan Investments	855,000	41,000	$ 908,000	616,000
Revenue from contract with customer, including assessed tax				24,498,000
Type of revenue			cto:ImpactFeeAndMitigationCreditSalesMember
Interest and Other Revenue	23,000	72,000	$ 72,000	145,000
Total Revenues	11,748,131	17,413,926	43,946,281	53,461,436
Lease Revenue - Base Rent
Revenues
Lease revenue	8,829,000	7,446,000	26,724,000	22,255,000
Lease Revenue - CAM
Revenues
Lease revenue	277,000	552,000	1,092,000	2,057,000
Lease Revenue - Reimbursements
Revenues
Lease revenue	508,000	644,000	1,597,000	2,009,000
Lease Revenue - Billboards
Revenues
Lease revenue	62,000	60,000	191,000	194,000
Above / Below Market Lease Accretion
Revenues
Lease revenue	607,000	600,000	1,811,000	1,779,000
Contributed Leased Assets Accretion
Revenues
Lease revenue	49,000	62,000	173,000	157,000
Land
Revenues
Revenue from contract with customer, including assessed tax	350,000	6,971,000	10,900,000	21,821,000
Impact Fee and Mitigation Credit Sales
Revenues
Revenue from contract with customer, including assessed tax		665,000		1,251,000
Subsurface Lease Revenue
Revenues
Revenue from contract with customer, including assessed tax	186,000	354,000	598,000	753,000
Subsurface Revenue - Other
Revenues
Revenue from contract with customer, including assessed tax	10,000	23,000	39,000	650,000
Timber Sales Revenue
Revenues
Revenue from contract with customer, including assessed tax	68,000		68,000
Fill Dirt and Other Revenue
Revenues
Revenue from contract with customer, including assessed tax				1,000
Income Properties
Revenues
Lease Incentive Amortization	(76,000)	(76,000)	(227,000)	(227,000)
Interest and Other Revenue	23,000	72,000	72,000	145,000
Total Revenues	10,260,831	9,360,155	31,360,544	28,347,181
Income Properties | Lease Revenue - Base Rent
Revenues
Lease revenue	8,811,000	7,446,000	26,652,000	22,233,000
Income Properties | Lease Revenue - CAM
Revenues
Lease revenue	277,000	552,000	1,092,000	2,057,000
Income Properties | Lease Revenue - Reimbursements
Revenues
Lease revenue	508,000	644,000	1,597,000	2,009,000
Income Properties | Lease Revenue - Billboards
Revenues
Lease revenue	62,000	60,000	191,000	194,000
Income Properties | Above / Below Market Lease Accretion
Revenues
Lease revenue	607,000	600,000	1,811,000	1,779,000
Income Properties | Contributed Leased Assets Accretion
Revenues
Lease revenue	49,000	62,000	173,000	157,000
Interest Income from Commercial Loan Investments
Revenues
Interest from Commercial Loan Investments	855,000	41,000	908,000	616,000
Total Revenues	855,559	41,262	908,324	615,728
Real Estate Operations
Revenues
Revenue from contract with customer, including assessed tax	632,000	8,013,000	11,677,000
Total Revenues	631,741	8,012,509	11,677,413	24,498,527
Real Estate Operations | Lease Revenue - Base Rent
Revenues
Lease revenue	18,000		72,000	22,000
Real Estate Operations | Land
Revenues
Revenue from contract with customer, including assessed tax	350,000	6,971,000	10,900,000	21,821,000
Real Estate Operations | Impact Fee and Mitigation Credit Sales
Revenues
Revenue from contract with customer, including assessed tax		665,000	0	1,251,000
Real Estate Operations | Subsurface Lease Revenue
Revenues
Revenue from contract with customer, including assessed tax	186,000	354,000	598,000	753,000
Real Estate Operations | Subsurface Revenue - Other
Revenues
Revenue from contract with customer, including assessed tax	10,000	$ 23,000	39,000	650,000
Real Estate Operations | Timber Sales Revenue
Revenues
Revenue from contract with customer, including assessed tax	68,000		68,000
Real Estate Operations | Fill Dirt and Other Revenue
Revenues
Revenue from contract with customer, including assessed tax	$ 18,000		$ 72,000	$ 1,000