LAND AND SUBSURFACE INTERESTS - Real Estate Operations Revenues (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
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
Real Estate Operations
Revenues
Subsurface Revenue									1,625,000	3,048,000	1,802,000
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
Land
Revenues
Revenue from contract with customer, including assessed tax									41,452,000	45,471,000	11,871,000
Land | Real Estate Operations
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
Tomoka Town Center Percentage-of-Completion Revenue | Real Estate Operations
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
Revenue from Reimbursement of Infrastructure Costs | Real Estate Operations
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
Impact Fee and Mitigation Credit Sales | Real Estate Operations
Revenues
Revenue from contract with customer, including assessed tax									1,338,000	2,126,000	2,220,000
Fill Dirt and Other Revenue
Revenues
Revenue from contract with customer, including assessed tax									3,000	17,000	261,000
Fill Dirt and Other Revenue | Real Estate Operations
Revenues
Revenue from contract with customer, including assessed tax									3,000	17,000	261,000
Agriculture | Real Estate Operations
Revenues
Revenue from contract with customer, including assessed tax									$ 23,000	$ 335,000	$ 60,000