COMMITMENTS AND CONTINGENCIES - Other Matters (Details)					3 Months Ended									9 Months Ended		12 Months Ended
	Oct. 31, 2019 a	Sep. 30, 2017 USD ($) a item	Mar. 31, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2019 USD ($) a	Jun. 30, 2019 a	Mar. 31, 2019 USD ($) a	Sep. 30, 2018 USD ($) a	Jun. 30, 2018 a	Mar. 31, 2018 a	Dec. 31, 2017 USD ($)	Mar. 31, 2017 USD ($) a	Jun. 30, 2016 USD ($)	Sep. 30, 2019 USD ($) a	Sep. 30, 2018 USD ($) a	Dec. 31, 2015 USD ($) a	Dec. 31, 2018 USD ($)
Contingencies
Acres sold | a	1,500				2.2	64.3	9.9	24.1	32.4	34.9				76.4	91.4
Escrow balance					$ 6,213,295			$ 8,477,796						$ 6,213,295	$ 8,477,796		$ 19,721,475
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														76	2,583
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														2,200,000
Accrued restoration cost			$ 713,000		166,000							$ 713,000		166,000		$ 1,700,000
Wetlands restoration | Minto Communities LLC
Contingencies
Cash deposited in (refunded from) escrow			$ 423,000								$ 189,500			77,833
Escrow balance					$ 156,000									$ 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