COMMITMENTS AND CONTINGENCIES - Other Matters (Details)		3 Months Ended						9 Months Ended		21 Months Ended	24 Months Ended
	Jun. 30, 2016 USD ($) a item	Jun. 30, 2017 a	Mar. 31, 2017 USD ($) a	Sep. 30, 2016 a	Jun. 30, 2016 USD ($) a	Mar. 31, 2016 a	Dec. 31, 2015 USD ($) a	Sep. 30, 2017 USD ($) a	Sep. 30, 2016 a	Sep. 30, 2017 USD ($)	Sep. 30, 2017 USD ($)
Contingencies
Acres sold | a		81.43	1,587.35	4.5		7.5		1,668.78	12.0
Unfavorable regulatory action
Contingencies
Accrued loss contingency							$ 187,500
Single institutional shareholder allegations
Contingencies
Cost incurred								$ 1,600,000			$ 3,000,000
Legal representation and third party costs								1,200,000
Minto Communities LLC
Contingencies
Acres sold | a			1,581
Wetlands restoration
Contingencies
Estimated cost	$ 2,000,000				$ 2,000,000			2,000,000
Accrued restoration cost							$ 1,700,000	840,000		$ 840,000	$ 840,000
Acres | a							148.4
Increase in accrual of remediation costs					$ 300,000
Environmental costs funded										$ 1,200,000
Wetlands restoration | Minto Communities LLC
Contingencies
Cash deposited in escrow			$ 423,000
Wetlands restoration | Minimum
Contingencies
Estimated cost							$ 1,700,000
Wetlands restoration | Maximum
Contingencies
Estimated cost							$ 1,900,000
Mitigation activities
Contingencies
Acres | a	54.66				54.66
Number of mitigation credits required to be utilized | item	36
Mitigation credits transferred	$ 298,000
Potential future costs accrued								$ 0
Mitigation activities | Unfavorable regulatory action
Contingencies
Acres | a			54.66