REAL ESTATE OPERATIONS - Other Real Estate Assets (Details)	3 Months Ended			6 Months Ended
	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) item	Jun. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Land and development costs and subsurface interests
Revenue from contract with customer, including assessed tax	$ 6,000		$ 261,000	$ 87,000	$ 496,000
Investment mitigation credits assets	$ 2,497,884			2,497,884		$ 2,322,596
Mitigation credits value per credit		$ 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				$ 1,500,000
Mitigation Bank
Land and development costs and subsurface interests
Number of mitigation credits acquired | item				20
Mitigation credits purchased		1,500,000
Mitigation credits value per credit		$ 75,000
Number of mitigation credits with cost basis | item				16
Amount of Mitigation Credits With Cost Basis				$ 1,200,000
Mitigation Bank JV
Land and development costs and subsurface interests
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