LAND AND SUBSURFACE INTERESTS - Real Estate Operations Revenues (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenues
Total Revenues	$ 14,259,319	$ 23,497,243
Real Estate Operations
Revenues
Revenue from contract with customer, including assessed tax	3,534,901	13,990,517
Subsurface Revenue	208,000	746,000
Total Revenues	3,534,901	13,990,517
Land
Revenues
Revenue from contract with customer, including assessed tax	3,300,000	13,117,000
Land | Real Estate Operations
Revenues
Revenue from contract with customer, including assessed tax	3,300,000	13,117,000
Impact Fee and Mitigation Credit Sales
Revenues
Revenue from contract with customer, including assessed tax		116,000
Impact Fee and Mitigation Credit Sales | Real Estate Operations
Revenues
Revenue from contract with customer, including assessed tax		116,000
Fill Dirt and Other Revenue | Real Estate Operations
Revenues
Revenue from contract with customer, including assessed tax	$ 27,000
Agriculture | Real Estate Operations
Revenues
Revenue from contract with customer, including assessed tax		$ 11,000