COMMITMENTS AND CONTINGENCIES - Other Matters (Details)				3 Months Ended				6 Months Ended
	Jun. 30, 2017 USD ($) a item	Jun. 30, 2016 USD ($)	Dec. 31, 2015 USD ($) a	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Mar. 31, 2017 USD ($) a	Jun. 30, 2016 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Contingencies
Escrow balance				$ 59,035,150				$ 29,709,862	$ 59,035,150	$ 128,430,049
Unfavorable regulatory action
Contingencies
Accrued loss contingency			$ 187,500
Minto Communities LLC
Contingencies
Acres sold | a						1,581
Accrued restoration cost						$ 430,000
Cash deposited in (refunded from) escrow						423,000
Wetlands restoration
Contingencies
Area of land (in acres) | a			148.4
Estimated cost		$ 2,000,000.0			$ 2,400,000		$ 2,000,000.0	2,400,000	2,400,000
Increase in accrual of remediation costs					$ 361,000		$ 300,000		$ 361,000
Environmental costs funded								2,300,000
Accrued restoration cost			$ 1,700,000					57,000
Wetlands restoration | Minto Communities LLC
Contingencies
Cash deposited in (refunded from) escrow				$ 77,833		$ 189,500		77,833
Escrow balance								$ 78,000		$ 156,000
Wetlands restoration | Minimum
Contingencies
Estimated cost			1,700,000
Wetlands restoration | Maximum
Contingencies
Estimated cost			$ 1,900,000
Mitigation activities
Contingencies
Area of land (in acres) | a	54.66
Number of mitigation credits required to be utilized | item	36
Mitigation credits transferred	$ 298,000