SUBSEQUENT EVENTS (Details)		1 Months Ended	9 Months Ended		12 Months Ended
	Oct. 05, 2017 USD ($)	Oct. 31, 2017 $ / item	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Dec. 31, 2016 $ / item	Sep. 29, 2017 USD ($)	Jul. 06, 2017 USD ($)
Subsequent events
Payment on line of credit | $			$ 16,000,000	$ 25,000,000
Quarterly distributions per depositary receipt (in dollars per receipt)					0.25
Special distribution per unit (in dollars per unit)					24.00
Special distribution per depository receipt (in dollars per receipt)					0.80
Subsequent event
Subsequent events
Payment on line of credit | $	$ 8,000,000
Amount of refinancing costs | $	125,000
Quarterly distribution per unit approved (in dollars per unit)		9.00
Quarterly distributions per depositary receipt (in dollars per receipt)		0.30
Special distribution per unit (in dollars per unit)		28.20
Special distribution per depository receipt (in dollars per receipt)		0.94
Woodland Park Apartments
Subsequent events
Credit line balance | $			$ 25,000,000				$ 25,000,000
Loan amount | $						$ 22,250,000	$ 16,000,000
Woodland Park Apartments | Subsequent event
Subsequent events
Payment on line of credit | $	$ 8,000,000