REAL ESTATE OPERATIONS - Other Real Estate Assets (Details)	3 Months Ended			9 Months Ended
	Sep. 30, 2020 USD ($) item	Mar. 31, 2020 USD ($) item	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) item	Sep. 30, 2019 USD ($)	Jul. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Land and development costs and subsurface interests
Revenue from contract with customer, including assessed tax	$ 544,000		$ 214,000	$ 631,000	$ 709,000
Investment mitigation credits assets	$ 2,220,167			2,220,167			$ 2,322,596
Mitigation credits value per credit		$ 75,000				$ 75,000	$ 75,000
Aggregate cost of sales				4,000	$ 0
Cost of revenues
Land and development costs and subsurface interests
Aggregate cost of sales				$ 3,000,000
Mitigation Bank
Land and development costs and subsurface interests
Number of mitigation credits acquired | item	20			20
Mitigation credits purchased	$ 1,500,000	1,500,000
Mitigation credits value per credit	$ 75,000	$ 75,000		$ 75,000
Number of mitigation credits with cost basis | item	21	16
Amount of Mitigation Credits With Cost Basis	$ 1,600,000	$ 1,200,000
Mitigation Bank JV
Land and development costs and subsurface interests
Number of mitigation credits acquired | item		2
Mitigation credits purchased		$ 224,000
Impact Fee and Mitigation Credit Sales
Land and development costs and subsurface interests
Revenue from contract with customer, including assessed tax				$ 4,000