COMMITMENTS AND CONTINGENCIES - Other Matters (Details)			3 Months Ended					12 Months Ended
	Jun. 30, 2017 a item	Jun. 30, 2016 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2017 USD ($)	Jun. 30, 2017 USD ($) a	Mar. 31, 2017 USD ($) a	Jun. 30, 2016 USD ($)	Dec. 31, 2019 USD ($) a	Dec. 31, 2018 USD ($) a	Dec. 31, 2017 USD ($) a	Dec. 31, 2015 USD ($) a
Contingencies
Acres sold | a								5,400
Escrow balance				$ 6,508,131				$ 128,430,049	$ 18,889,509	$ 6,508,131
Potential future costs accrued								0
Unfavorable regulatory action
Contingencies
Accrued loss contingency											$ 187,500
Minto Communities LLC
Contingencies
Acres sold | a						1,581
Land Sales
Contingencies
Acres sold | a									2,697	1,700
Wetlands restoration
Contingencies
Area of land (in acres) | a											148.4
Estimated cost		$ 2,000,000	$ 2,400,000				$ 2,000,000	2,400,000
Increase in accrual of remediation costs			361,000				$ 300,000
Environmental costs funded								2,300,000
Accrued restoration cost						$ 430,000		121,000			$ 1,700,000
Cost incurred								2,300,000
Wetlands restoration | Minto Communities LLC
Contingencies
Cash deposited in (refunded from) escrow			$ 77,833	$ 189,500		$ 423,000
Escrow balance								$ 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				54.66	54.66
Number of mitigation credits required to be utilized | item	36
Mitigation credits transferred					$ 298,000