REVENUE RECOGNITION - Major Good or Service (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenues
Lease Revenue	$ 9,948,000	$ 7,778,000	$ 19,336,000	$ 15,053,000
Lease Incentive Amortization	(76,000)		(151,000)
Interest from Commercial Loan Investments	274,000	553,000	575,000	1,090,000
Total Revenues	13,833,185	22,837,783	38,684,784	61,551,067
Lease Revenue - Base Rent
Revenues
Lease Revenue	7,376,000	6,125,000	14,809,000	11,690,000
Lease Revenue - CAM
Revenues
Lease Revenue	891,000	466,000	1,505,000	965,000
Lease Revenue - Reimbursements
Revenues
Lease Revenue	801,000	371,000	1,365,000	791,000
Lease Revenue - Billboards
Revenues
Lease Revenue	70,000	65,000	134,000	126,000
Above / Below Market Lease Accretion
Revenues
Lease Revenue	600,000	550,000	1,179,000	1,081,000
Contributed Leased Assets Accretion
Revenues
Lease Revenue	85,000		95,000
Land
Revenues
Revenue from contract with customer, including assessed tax	1,734,000	10,858,000	14,851,000	39,564,000
Revenue from Reimbursement of Infrastructure Costs
Revenues
Revenue from contract with customer, including assessed tax		955,000		1,276,000
Impact Fee and Mitigation Credit Sales
Revenues
Revenue from contract with customer, including assessed tax	470,000	1,222,000	586,000	1,439,000
Subsurface Lease Revenue
Revenues
Lease Revenue	201,000	201,000	400,000	400,000
Subsurface Revenue - Other
Revenues
Revenue from contract with customer, including assessed tax	79,000	21,000	626,000	53,000
Golf Operations
Revenues
Revenue from contract with customer, including assessed tax	1,283,000	1,384,000	2,638,000	2,858,000
Timber Sales Revenue
Revenues
Revenue from contract with customer, including assessed tax		68,000		211,000
Interest and Other Revenue
Revenues
Interest and Other Revenue	45,000	(1,000)	73,000	7,000
Income Properties
Revenues
Lease Revenue	9,736,000	7,566,000	18,914,000	14,631,000
Lease Incentive Amortization	(76,000)		(151,000)
Total Revenues	9,781,299	7,565,007	18,987,026	14,638,247
Income Properties | Lease Revenue - Base Rent
Revenues
Lease Revenue	7,365,000	6,114,000	14,787,000	11,668,000
Income Properties | Lease Revenue - CAM
Revenues
Lease Revenue	891,000	466,000	1,505,000	965,000
Income Properties | Lease Revenue - Reimbursements
Revenues
Lease Revenue	801,000	371,000	1,365,000	791,000
Income Properties | Lease Revenue - Billboards
Revenues
Lease Revenue	70,000	65,000	134,000	126,000
Income Properties | Above / Below Market Lease Accretion
Revenues
Lease Revenue	600,000	550,000	1,179,000	1,081,000
Income Properties | Contributed Leased Assets Accretion
Revenues
Lease Revenue	85,000		95,000
Income Properties | Interest and Other Revenue
Revenues
Interest and Other Revenue	45,000	(1,000)	73,000	7,000
Commercial Loan Investments
Revenues
Interest from Commercial Loan Investments	274,000	553,000	575,000	1,090,000
Total Revenues	273,467	553,159	574,466	1,089,648
Real Estate Operations
Revenues
Lease Revenue	201,000	201,000	400,000	400,000
Total Revenues	2,484,314	13,257,355	16,463,644	42,731,815
Real Estate Operations | Land
Revenues
Revenue from contract with customer, including assessed tax	1,734,000	10,858,000	14,851,000	39,564,000
Real Estate Operations | Revenue from Reimbursement of Infrastructure Costs
Revenues
Revenue from contract with customer, including assessed tax		955,000		1,276,000
Real Estate Operations | Impact Fee and Mitigation Credit Sales
Revenues
Revenue from contract with customer, including assessed tax	470,000	1,222,000	586,000	1,439,000
Real Estate Operations | Subsurface Lease Revenue
Revenues
Lease Revenue	201,000	201,000	400,000	400,000
Real Estate Operations | Subsurface Revenue - Other
Revenues
Revenue from contract with customer, including assessed tax	79,000	21,000	626,000	53,000
Golf Operations
Revenues
Revenue from contract with customer, including assessed tax	1,283,000	1,384,000	2,638,000	2,858,000
Total Revenues	1,282,918	1,383,513	2,637,274	2,858,457
Agriculture and Other Income
Revenues
Lease Revenue	11,000	11,000	22,000	22,000
Revenue from contract with customer, including assessed tax		$ 68,000		$ 211,000
Type of revenue		us-gaap:TimberMember		us-gaap:TimberMember
Total Revenues	11,187	$ 78,749	22,374	$ 232,900
Agriculture and Other Income | Lease Revenue - Base Rent
Revenues
Lease Revenue	$ 11,000	$ 11,000	$ 22,000	$ 22,000