LAND AND SUBSURFACE INTERESTS - Real Estate Operations Revenues (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenues
Revenue from contract with customer, including assessed tax				$ 24,498,000
Subsurface Revenue				1,403,000
Total Revenues	$ 11,748,131	$ 17,413,926	$ 43,946,281	53,461,436
Real Estate Operations
Revenues
Revenue from contract with customer, including assessed tax	632,000	8,013,000	11,677,000
Subsurface Revenue	196,000	377,000	637,000
Total Revenues	631,741	8,012,509	11,677,413	24,498,527
Land
Revenues
Revenue from contract with customer, including assessed tax	350,000	6,971,000	10,900,000	21,821,000
Land | Real Estate Operations
Revenues
Revenue from contract with customer, including assessed tax	350,000	6,971,000	10,900,000	21,821,000
Impact Fee and Mitigation Credit Sales
Revenues
Revenue from contract with customer, including assessed tax		665,000		1,251,000
Impact Fee and Mitigation Credit Sales | Real Estate Operations
Revenues
Revenue from contract with customer, including assessed tax		$ 665,000	0	1,251,000
Fill Dirt and Other Revenue
Revenues
Revenue from contract with customer, including assessed tax				1,000
Fill Dirt and Other Revenue | Real Estate Operations
Revenues
Revenue from contract with customer, including assessed tax	18,000		72,000	1,000
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	$ 68,000		$ 68,000