REVENUE RECOGNITION - Major Good or Service (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenues
Lease Revenue									$ 40,911,000	$ 32,278,000	$ 26,384,000
Lease Incentive Amortization									(302,000)	(50,000)
Interest from Commercial Loan Investments									616,000	2,053,000	2,588,000
Interest and Other Revenue									145,000
Total Revenues	$ 33,227,164	$ 17,413,926	$ 12,550,267	$ 23,497,243	$ 16,041,186	$ 11,583,182	$ 21,454,270	$ 37,238,340	86,688,600	86,316,978	65,884,467
Lease Revenue - Base Rent
Revenues
Lease Revenue									31,610,000	24,694,000	19,205,000
Lease Revenue - CAM
Revenues
Lease Revenue									2,905,000	2,208,000	2,030,000
Lease Revenue - Reimbursements
Revenues
Lease Revenue									2,934,000	2,125,000	1,450,000
Lease Revenue - Billboards
Revenues
Lease Revenue									250,000	251,000	202,000
Above / Below Market Lease Accretion
Revenues
Lease Revenue									2,339,000	2,194,000	2,240,000
Contributed Leased Assets Accretion
Revenues
Lease Revenue									218,000
Land
Revenues
Revenue from contract with customer, including assessed tax									41,452,000	45,471,000	11,871,000
Tomoka Town Center Percentage-of-Completion Revenue
Revenues
Revenue from contract with customer, including assessed tax											17,490,000
Revenue from Reimbursement of Infrastructure Costs
Revenues
Revenue from contract with customer, including assessed tax									1,556,000	1,860,000	4,500,000
Impact Fee and Mitigation Credit Sales
Revenues
Revenue from contract with customer, including assessed tax									1,338,000	2,126,000	2,220,000
Subsurface Lease Revenue
Revenues
Revenue from contract with customer, including assessed tax									957,000	856,000	1,257,000
Subsurface Revenue - Other
Revenues
Revenue from contract with customer, including assessed tax									668,000	2,192,000	545,000
Fill Dirt and Other Revenue
Revenues
Revenue from contract with customer, including assessed tax									3,000	17,000	261,000
Timber Sales Revenue
Revenues
Revenue from contract with customer, including assessed tax										291,000	10,000
Interest and Other Revenue
Revenues
Interest and Other Revenue										29,000	16,000
Income Properties
Revenues
Lease Revenue									39,931,000	31,378,000	25,077,000
Lease Incentive Amortization									(302,000)	(50,000)
Interest and Other Revenue									145,000
Total Revenues	11,728,550	9,360,155	9,781,299	9,205,727	8,840,425	7,928,258	7,565,007	7,073,240	40,075,731	31,406,930	25,092,484
Income Properties | Lease Revenue - Base Rent
Revenues
Lease Revenue									31,587,000	24,650,000	19,155,000
Income Properties | Lease Revenue - CAM
Revenues
Lease Revenue									2,905,000	2,208,000	2,030,000
Income Properties | Lease Revenue - Reimbursements
Revenues
Lease Revenue									2,934,000	2,125,000	1,450,000
Income Properties | Lease Revenue - Billboards
Revenues
Lease Revenue									250,000	251,000	202,000
Income Properties | Above / Below Market Lease Accretion
Revenues
Lease Revenue									2,339,000	2,194,000	2,240,000
Income Properties | Contributed Leased Assets Accretion
Revenues
Lease Revenue									218,000
Income Properties | Interest and Other Revenue
Revenues
Interest and Other Revenue										29,000	16,000
Commercial Loan Investments
Revenues
Interest from Commercial Loan Investments									616,000	2,053,000	2,588,000
Total Revenues		41,262	273,467	300,999	325,240	637,801	553,159	536,489	615,728	2,052,689	2,588,235
Real Estate Operations
Revenues
Lease Revenue									980,000	900,000	1,307,000
Total Revenues	$ 21,498,614	$ 8,012,509	$ 2,495,501	$ 13,990,517	$ 6,875,521	$ 3,017,123	$ 13,336,104	$ 29,628,611	45,997,141	52,857,359	38,203,748
Real Estate Operations | Lease Revenue - Base Rent
Revenues
Lease Revenue									23,000	44,000	50,000
Real Estate Operations | Land
Revenues
Revenue from contract with customer, including assessed tax									41,452,000	45,471,000	11,871,000
Real Estate Operations | Tomoka Town Center Percentage-of-Completion Revenue
Revenues
Revenue from contract with customer, including assessed tax											17,490,000
Real Estate Operations | Revenue from Reimbursement of Infrastructure Costs
Revenues
Revenue from contract with customer, including assessed tax									1,556,000	1,860,000	4,500,000
Real Estate Operations | Impact Fee and Mitigation Credit Sales
Revenues
Revenue from contract with customer, including assessed tax									1,338,000	2,126,000	2,220,000
Real Estate Operations | Subsurface Lease Revenue
Revenues
Revenue from contract with customer, including assessed tax									957,000	856,000	1,257,000
Real Estate Operations | Subsurface Revenue - Other
Revenues
Revenue from contract with customer, including assessed tax									668,000	2,192,000	545,000
Real Estate Operations | Fill Dirt and Other Revenue
Revenues
Revenue from contract with customer, including assessed tax									$ 3,000	17,000	261,000
Real Estate Operations | Timber Sales Revenue
Revenues
Revenue from contract with customer, including assessed tax										$ 291,000	$ 10,000