REVENUE RECOGNITION - Major Good or Service (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenues
Lease Revenue	$ 9,642,000	$ 8,185,000	$ 28,977,000	$ 23,239,000
Lease Incentive Amortization	(76,000)		(227,000)
Interest from Commercial Loan Investments	41,000	638,000	616,000	1,727,000
Interest and Other Revenue	72
Total Revenues	18,428,697	12,380,602	57,113,481	73,931,669
Lease Revenue - Base Rent
Revenues
Lease Revenue	7,446,000	6,195,000	22,255,000	17,885,000
Lease Revenue - CAM
Revenues
Lease Revenue	552,000	450,000	2,057,000	1,415,000
Lease Revenue - Reimbursements
Revenues
Lease Revenue	644,000	676,000	2,009,000	1,467,000
Lease Revenue - Billboards
Revenues
Lease Revenue	60,000	59,000	194,000	185,000
Above / Below Market Lease Accretion
Revenues
Lease Revenue	600,000	552,000	1,779,000	1,633,000
Contributed Leased Assets Accretion
Revenues
Lease Revenue	62,000		157,000
Land
Revenues
Revenue from contract with customer, including assessed tax	6,971,000		21,821,000	39,564,000
Revenue from Reimbursement of Infrastructure Costs
Revenues
Revenue from contract with customer, including assessed tax				1,276,000
Impact Fee and Mitigation Credit Sales
Revenues
Revenue from contract with customer, including assessed tax	665,000	548,000	1,251,000	1,987,000
Subsurface Lease Revenue
Revenues
Lease Revenue	354,000	253,000	753,000	654,000
Subsurface Revenue - Other
Revenues
Revenue from contract with customer, including assessed tax	23,000	2,121,000	650,000	2,173,000
Fill Dirt and Other Revenue
Revenues
Revenue from contract with customer, including assessed tax		4,000	1,000	4,000
Golf Operations
Revenues
Revenue from contract with customer, including assessed tax	1,015,000	797,000	3,652,000	3,656,000
Timber Sales Revenue
Revenues
Revenue from contract with customer, including assessed tax		80,000		291,000
Interest and Other Revenue
Revenues
Interest and Other Revenue		7,000	145,000	14,000
Income Properties
Revenues
Lease Revenue	9,288,000	7,921,000	28,202,000	22,552,000
Lease Incentive Amortization	(76,000)		(227,000)
Interest and Other Revenue	72
Total Revenues	9,360,155	7,928,258	28,347,181	22,566,505
Income Properties | Lease Revenue - Base Rent
Revenues
Lease Revenue	7,446,000	6,184,000	22,233,000	17,852,000
Income Properties | Lease Revenue - CAM
Revenues
Lease Revenue	552,000	450,000	2,057,000	1,415,000
Income Properties | Lease Revenue - Reimbursements
Revenues
Lease Revenue	644,000	676,000	2,009,000	1,467,000
Income Properties | Lease Revenue - Billboards
Revenues
Lease Revenue	60,000	59,000	194,000	185,000
Income Properties | Above / Below Market Lease Accretion
Revenues
Lease Revenue	600,000	552,000	1,779,000	1,633,000
Income Properties | Contributed Leased Assets Accretion
Revenues
Lease Revenue	62,000		157,000
Income Properties | Interest and Other Revenue
Revenues
Interest and Other Revenue		7,000	145,000	14,000
Commercial Loan Investments
Revenues
Interest from Commercial Loan Investments	41,262	638,000	616,000	1,727,000
Total Revenues	41,262	637,801	615,728	1,727,449
Real Estate Operations
Revenues
Lease Revenue	354,000	253,000	753,000	654,000
Total Revenues	8,012,509	2,926,406	24,476,153	45,658,221
Real Estate Operations | Land
Revenues
Revenue from contract with customer, including assessed tax	6,971,000		21,821,000	39,564,000
Real Estate Operations | Revenue from Reimbursement of Infrastructure Costs
Revenues
Revenue from contract with customer, including assessed tax				1,276,000
Real Estate Operations | Impact Fee and Mitigation Credit Sales
Revenues
Revenue from contract with customer, including assessed tax	665,000	548,000	1,251,000	1,987,000
Real Estate Operations | Subsurface Lease Revenue
Revenues
Lease Revenue	354,000	253,000	753,000	654,000
Real Estate Operations | Subsurface Revenue - Other
Revenues
Revenue from contract with customer, including assessed tax	23,000	2,121,000	650,000	2,173,000
Real Estate Operations | Fill Dirt and Other Revenue
Revenues
Revenue from contract with customer, including assessed tax		4,000	1,000	4,000
Golf Operations
Revenues
Total Revenues	1,014,771	797,420	3,652,045	3,655,877
Golf Operations | Golf Operations
Revenues
Revenue from contract with customer, including assessed tax	$ 1,015,000	797,000	3,652,000	3,656,000
Agriculture and Other Income
Revenues
Lease Revenue		$ 11,000	22,374	$ 33,000
Type of revenue		us-gaap:TimberMember		us-gaap:TimberMember
Total Revenues		$ 90,717	22,374	$ 323,617
Agriculture and Other Income | Lease Revenue - Base Rent
Revenues
Lease Revenue		11,000	$ 22,000	33,000
Agriculture and Other Income | Timber Sales Revenue
Revenues
Revenue from contract with customer, including assessed tax		$ 80,000		$ 291,000