LAND AND SUBSURFACE INTERESTS - Real Estate Operations Revenues (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenues
Revenue from contract with customer, including assessed tax				$ 16,485,000
Subsurface Revenue				1,026,000
Total Revenues	$ 17,938,831	$ 12,550,267	$ 32,198,150	36,047,510
Real Estate Operations
Revenues
Revenue from contract with customer, including assessed tax	7,511,000	2,495,000	11,046,000
Subsurface Revenue	234,000	280,000	442,000
Total Revenues	7,510,771	2,495,501	11,045,672	16,486,018
Land
Revenues
Revenue from contract with customer, including assessed tax	7,250,000	1,734,000	10,550,000	14,851,000
Land | Real Estate Operations
Revenues
Revenue from contract with customer, including assessed tax	7,250,000	1,734,000	10,550,000	14,851,000
Impact Fee and Mitigation Credit Sales
Revenues
Revenue from contract with customer, including assessed tax		470,000		586,000
Impact Fee and Mitigation Credit Sales | Real Estate Operations
Revenues
Revenue from contract with customer, including assessed tax		470,000	0	586,000
Fill Dirt and Other Revenue | Real Estate Operations
Revenues
Revenue from contract with customer, including assessed tax	$ 27,000		$ 54,000
Agriculture
Revenues
Revenue from contract with customer, including assessed tax				$ 22,000
Agriculture | Real Estate Operations
Revenues
Revenue from contract with customer, including assessed tax		$ 11,000