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INVESTMENT IN UNCONSOLIDATED JOINT VENTURES (Details)									1 Months Ended					9 Months Ended		12 Months Ended
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES (Details)	May 31, 2018 USD ($)	Sep. 12, 2016 USD ($)	Jul. 08, 2016 USD ($)	Sep. 30, 2015 USD ($)	Sep. 28, 2015 USD ($)	Oct. 28, 2009 USD ($) item	Mar. 07, 2005 USD ($) item	Mar. 02, 2005 USD ($) item	Aug. 31, 2014 USD ($)	Jun. 30, 2013 USD ($)	Feb. 28, 2007 USD ($)	Jan. 31, 2007 USD ($)	Oct. 31, 2004 USD ($)	Sep. 30, 2018 USD ($) property item	Sep. 30, 2017 USD ($) item	Dec. 31, 2005 USD ($)	Dec. 31, 2017 USD ($) item	Mar. 01, 2017 USD ($)	Dec. 31, 2006 USD ($)	Oct. 03, 2005 USD ($) item	Sep. 30, 2004 USD ($) item	Aug. 31, 2004 USD ($) item	Nov. 30, 2001 USD ($) item
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Number of limited partnerships and limited liability companies in which the entity has invested \| item														8
Number of partnerships investing in commercial property \| item														3
Investments in joint venture														$ 1,804,747	$ 8,452,484		$ 7,212,044
Outstanding amount of mortgage														252,781,336			$ 233,221,258
Number of units \| item															1,033
Number of units retained for long-term investment \| item															(690)
Number of units sold \| item															297
Interest paid														9,240,000	$ 7,802,000
Units to be sold \| item															343
Distribution to the Partnership														3,358,443	$ 3,358,648
Carrying value of investment to discontinue applying the equity method														$ 0
Limited Partnerships
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Number of limited partnerships and limited liability companies in which the entity has invested \| item														9
Dexter Park
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Ownership interest (as a percent)						40.00%									40.00%
Investments in joint venture						$ 15,925,000									$ 2,914,262
Outstanding amount of mortgage	$ 82,000,000													$ 125,000,000
Number of units \| item						409									409
Number of units retained for long-term investment \| item															(409)
Purchase price of investments						$ 129,500,000
Distribution to the Partnership	$ 41,200,000
Dexter Park \| Mortgages payable
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Interest rate (as a percent)						5.57%
Period for which the entity is required to make interest only payments						2 years
Amortization period of debt						30 years
Borrowings						$ 89,914,000
Hamilton Bay Apts
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Ownership interest (as a percent)															50.00%					50.00%
Investments in joint venture															$ 2,238,850					$ 2,500,000
Number of units \| item															48					168
Number of units retained for long-term investment \| item																				48
Number of units sold \| item															22					120
Interest rate (as a percent)											5.57%
Period for which the entity is required to make interest only payments											5 years
Amortization period of debt											30 years
Purchase price of investments																				$ 30,875,000
Borrowings											$ 4,750,000
Units to be sold \| item															48
Hamilton Bay Apts \| Mortgages payable
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Outstanding amount of mortgage																		$ 2,222,000
Hamilton Bay Sales
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Ownership interest (as a percent)															50.00%
Investments in joint venture															$ 10,431
Number of units \| item														4	120
Number of units sold \| item															120
Units to be sold \| item															120
Hamilton Essex Development, LLC and Hamilton Essex 81, LLC
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Ownership interest (as a percent)							50.00%
Investments in joint venture							$ 2,000,000
Purchase price of investments							14,300,000
Hamilton Essex Development, LLC and Hamilton Essex 81, LLC \| Mortgages payable
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Borrowings							$ 10,750,000
Hamilton Essex 81
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Ownership interest (as a percent)															50.00%
Number of units \| item							48								49
Number of units retained for long-term investment \| item															(49)
Capital contributions					$ 100,000
Number of properties \| item							1
Distribution to the Partnership				$ 978,193
Hamilton Essex 81 \| Mortgages payable
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Outstanding amount of mortgage														$ 10,000,000
Borrowings				$ 10,000,000
Term of debt				10 years
Hamilton Essex 81 \| Mortgages payable \| LIBOR
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Margin over basis of interest rate (as a percent)				2.18%
Hamilton Essex Development
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Ownership interest (as a percent)															50.00%
Investments in joint venture															$ 1,357,209
Number of units \| item															1
Number of units retained for long-term investment \| item															(1)
Capacity of real estate property (in cars per lot) \| item							50
Capital contributions					978,193
Hamilton Essex Development \| Mortgages payable
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Repayment of loan					$ 1,952,286
Hamilton 1025
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Ownership interest (as a percent)								50.00%							50.00%
Investments in joint venture								$ 2,352,000							$ 1,504,948
Number of units \| item								176						3	176
Number of units retained for long-term investment \| item								49							(1)
Number of units sold \| item								127						15	155		20
Purchase price of investments								$ 23,750,000
Capital contributions			$ 2,359,500
Units to be sold \| item															176
Hamilton 1025 \| Mortgages payable
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Interest rate (as a percent)								5.67%
Period for which the entity is required to make interest only payments								5 years
Amortization period of debt								30 years
Borrowings								$ 5,000,000
Term of debt								10 years
Hamilton Minuteman
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Ownership interest (as a percent)															50.00%						50.00%
Investments in joint venture															$ 9,786						$ 5,075,000
Outstanding amount of mortgage														$ 6,000,000
Number of units \| item															42						42
Number of units retained for long-term investment \| item															(42)
Purchase price of investments																					$ 10,100,000
Amount returned to partnership													$ 3,775,000
Cash contribution by the entity towards loan																			$ 1,250,000
Hamilton Minuteman \| Mortgages payable
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Mortgage amount		$ 6,000,000
Interest rate (as a percent)		3.71%										5.67%
Period for which the entity is required to make interest only payments		15 years										5 years
Amortization period of debt												30 years
Borrowings												$ 5,500,000	$ 8,025,000
Term of debt												10 years
Repayment of loan		$ 5,158,000
Distribution to the Partnership		$ 385,000
Hamilton on Main Apts
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Ownership interest (as a percent)															50.00%							50.00%
Investments in joint venture															$ 417,000							$ 8,000,000
Number of units \| item															148							280
Number of units retained for long-term investment \| item															(148)
Number of units sold \| item																						137
Purchase price of investments																						$ 56,000,000
Hamilton on Main Apartments, LLC \| Mortgages payable
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Outstanding amount of mortgage														16,900,000
Interest rate (as a percent)									4.34%							5.18%
Period for which the entity is required to make interest only payments																3 years
Amortization period of debt																30 years
Borrowings									$ 16,900,000							$ 16,825,000
Term of debt									10 years							10 years
Repayment of loan									$ 15,205,000
Cost associated with loan extension									$ 161,000
Term excluding period for which interest only payments to be made																7 years
Net proceeds after funding escrow accounts and closing costs																$ 16,700,000
345 Franklin
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Ownership interest (as a percent)															50.00%								50.00%
Investments in joint venture																							$ 1,533,000
Number of units \| item															40								40
Number of units retained for long-term investment \| item															(40)
Distribution to the Partnership										$ 1,610,000
345 Franklin \| Mortgages payable
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Interest rate (as a percent)										3.87%
Period for which the entity is required to make interest only payments										3 years
Amortization period of debt										30 years
Borrowings										$ 10,000,000
Term of debt										15 years
Repayment of loan										$ 6,776,000
Investment Properties
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Investments in joint venture														$ 1,804,747
Number of units \| property														913
Number of units retained for long-term investment \| property														(690)
Number of units sold \| property														217
Units to be sold \| property														223
Residential buildings
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Number of units \| item															1,030
Residential buildings \| Dexter Park
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Number of units \| item															409
Residential buildings \| Hamilton Bay Apts
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Number of units \| item															48
Residential buildings \| Hamilton Bay Sales
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Number of units \| item															120
Residential buildings \| Hamilton Essex 81
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Number of units \| item															48
Residential buildings \| Hamilton 1025
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Number of units \| item															175
Residential buildings \| Hamilton Minuteman
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Number of units \| item															42
Residential buildings \| Hamilton on Main Apts
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Number of units \| item															148
Residential buildings \| 345 Franklin
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Number of units \| item															40
Residential buildings \| Investment Properties
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Number of units \| property														910
Commercial
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Number of units \| item															3
Commercial \| Hamilton Essex 81
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Number of units \| item															1
Commercial \| Hamilton Essex Development
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Number of units \| item															1
Commercial \| Hamilton 1025
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Number of units \| item															1
Commercial \| Investment Properties
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Number of units \| property														3
Management Company [Member]
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Number of employees having ownership interest in the investment properties \| item														6
Minimum \| Mortgages payable
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Interest rate (as a percent)														3.76%
Minimum \| Limited Partnerships
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Ownership interest (as a percent)														40.00%
Minimum \| Harold Brown
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Ownership interest (as a percent)														43.20%
Maximum \| Mortgages payable
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Interest rate (as a percent)														5.81%
Maximum \| Limited Partnerships
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Ownership interest (as a percent)														50.00%
Maximum \| Harold Brown
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES
Ownership interest (as a percent)														56.00%