INVESTMENT IN UNCONSOLIDATED JOINT VENTURES (Balance Sheet) (Details)	Dec. 31, 2017 USD ($) item	Dec. 31, 2016 USD ($) item	Feb. 01, 2016 item	Dec. 31, 2015 USD ($) item	Feb. 01, 2015 item	Oct. 28, 2009 USD ($)	Oct. 03, 2005 USD ($) item	Mar. 02, 2005 USD ($) item	Sep. 30, 2004 USD ($) item	Aug. 31, 2004 USD ($) item	Nov. 30, 2001 USD ($) item
ASSETS
Rental Properties	$ 129,725,326	$ 142,881,344		$ 148,681,873
Assets held for sales	4,036,272
Cash & Cash Equivalents	2,183,047	2,081,578		1,873,377
Rent Receivable	216,622	265,073		96,371
Real Estate Tax Escrow	642,015	612,537		513,139
Prepaid Expenses & Other Assets	2,198,753	2,361,142		2,282,252
Total Assets	139,002,035	148,201,674		153,447,012
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable	124,145,012			135,657,989
Accounts Payable and Accrued Expenses	1,087,616	1,033,761		1,254,230
Advance Rental Payments and Security Deposits	3,486,413	3,736,609		3,541,179
Total Liabilities	128,719,041	134,922,668		140,453,398
Partners' Capital	10,282,994	13,279,006		12,993,614
Total Liabilities and Capital	139,002,035	148,201,674		153,447,012
Investment in Unconsolidated Joint Ventures	7,212,044	8,336,505		7,819,162
Distribution and Loss in Excess of investments in Unconsolidated Joint Venture	(2,806,319)	(2,577,606)		(2,288,090)
Total Investment in Unconsolidated Joint Ventures (Net)	4,405,725	$ 5,758,899		$ 5,531,072
Total units/ condominiums
Total | item				1,033
Units to be retained | item				786
Units to be sold | item				247
Units sold | item				242
Unsold units | item				5
Units unsold with deposits for future sale | item				2
NERA 50%
LIABILITIES AND PARTNERS' CAPITAL
Investment in Unconsolidated Joint Ventures	$ 7,212,044
Residential buildings
Total units/ condominiums
Total | item				1,030
Commercial
Total units/ condominiums
Total | item				3
Investment Properties
Total units/ condominiums
Total | item	1,033	1,033
Units to be retained | item	689	689
Units to be sold | item	344	344
Units sold | item			310		258
Unsold units | item			34		38
Units unsold with deposits for future sale | item		6	11
Investment Properties | Residential buildings
Total units/ condominiums
Total | item	1,030	1,030
Investment Properties | Commercial
Total units/ condominiums
Total | item	3	3
Hamilton Essex 81
ASSETS
Rental Properties	$ 7,615,554	$ 8,011,942		$ 8,419,054
Cash & Cash Equivalents	293,801	167,953		200,185
Rent Receivable	21,478	25,604		9,058
Real Estate Tax Escrow	95,544	127,728		33,643
Prepaid Expenses & Other Assets	77,490	96,307		104,975
Total Assets	8,103,867	8,429,534		8,766,915
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable	9,893,135			9,865,557
Accounts Payable and Accrued Expenses	57,811	59,227		69,413
Advance Rental Payments and Security Deposits	313,218	218,582		202,470
Total Liabilities	10,264,164	10,157,155		10,137,440
Partners' Capital	(2,160,297)	(1,727,621)		(1,370,525)
Total Liabilities and Capital	8,103,867	$ 8,429,534		$ 8,766,915
Partners' Capital % - NERA		50.00%		50.00%
Distribution and Loss in Excess of investments in Unconsolidated Joint Venture	$ (1,080,148)	$ (863,810)		$ (685,263)
Total units/ condominiums
Total | item	49	49		49
Units to be retained | item	49	49		49
Hamilton Essex 81 | NERA 50%
LIABILITIES AND PARTNERS' CAPITAL
Partners' Capital % - NERA	50.00%
Hamilton Essex 81 | Residential buildings
Total units/ condominiums
Total | item	48	48		48
Hamilton Essex 81 | Commercial
Total units/ condominiums
Total | item	1	1		1
Hamilton Essex Development
ASSETS
Rental Properties	$ 2,598,297	$ 2,622,011		$ 2,618,666
Cash & Cash Equivalents	46,076	52,321		16,036
Prepaid Expenses & Other Assets	697	615		565
Total Assets	2,645,070	2,674,947		2,635,267
LIABILITIES AND PARTNERS' CAPITAL
Accounts Payable and Accrued Expenses	1,700	1,700		1,700
Total Liabilities	1,700	1,700		1,700
Partners' Capital	2,643,370	2,673,247		2,633,567
Total Liabilities and Capital	$ 2,645,070	$ 2,674,947		$ 2,635,267
Partners' Capital % - NERA		50.00%		50.00%
Investment in Unconsolidated Joint Ventures				$ 1,316,782
Total units/ condominiums
Total | item	1	1		1
Units to be retained | item	1	1		1
Hamilton Essex Development | NERA 50%
LIABILITIES AND PARTNERS' CAPITAL
Partners' Capital % - NERA	50.00%
Investment in Unconsolidated Joint Ventures	$ 1,321,684	$ 1,336,623
Hamilton Essex Development | Commercial
Total units/ condominiums
Total | item	1	1		1
345 Franklin
ASSETS
Rental Properties	$ 6,325,676	$ 6,587,662		$ 6,780,019
Cash & Cash Equivalents	105,074	57,635		160,086
Rent Receivable	9,057	9,840		3,738
Real Estate Tax Escrow	18,171	18,570		15,322
Prepaid Expenses & Other Assets	53,813	50,553		37,088
Total Assets	6,511,791	6,724,260		6,996,253
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable	9,672,846			9,916,769
Accounts Payable and Accrued Expenses	56,417	65,948		63,268
Advance Rental Payments and Security Deposits	234,870	236,679		221,871
Total Liabilities	9,964,133	10,151,852		10,201,908
Partners' Capital	(3,452,342)	(3,427,592)		(3,205,655)
Total Liabilities and Capital	$ 6,511,791	$ 6,724,260		$ 6,996,253
Partners' Capital % - NERA		50.00%		50.00%							50.00%
Investment in Unconsolidated Joint Ventures											$ 1,533,000
Distribution and Loss in Excess of investments in Unconsolidated Joint Venture		$ (1,713,796)		$ (1,602,828)
Total units/ condominiums
Total | item	40	40		40							40
Units to be retained | item	40	40		40
345 Franklin | NERA 50%
LIABILITIES AND PARTNERS' CAPITAL
Partners' Capital % - NERA	50.00%
Distribution and Loss in Excess of investments in Unconsolidated Joint Venture	$ (1,726,171)
345 Franklin | Residential buildings
Total units/ condominiums
Total | item	40	40		40
Hamilton 1025
ASSETS
Rental Properties		$ 3,706,705		$ 4,939,620
Assets held for sales	$ 1,670,652
Cash & Cash Equivalents	86,495	144,831		27,721
Rent Receivable	7,129	10,568		4,164
Real Estate Tax Escrow				80,196
Prepaid Expenses & Other Assets	362,044	403,514		56,048
Total Assets	2,126,320	4,265,618		5,107,749
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable				4,728,751
Accounts Payable and Accrued Expenses	11,151	9,432		28,736
Advance Rental Payments and Security Deposits	11,649	61,883		91,649
Total Liabilities	22,800	71,315		4,849,136
Partners' Capital	2,103,520	4,194,303		258,613
Total Liabilities and Capital	$ 2,126,320	$ 4,265,618		$ 5,107,749
Partners' Capital % - NERA		50.00%		50.00%				50.00%
Investment in Unconsolidated Joint Ventures				$ 129,305				$ 2,352,000
Total units/ condominiums
Total | item	176	176		176				176
Units to be retained | item	(18)	0		48				(49)
Units to be sold | item	176	176		127
Units sold | item			159	127	139			127
Unsold units | item	20	37	17
Units unsold with deposits for future sale | item		5	7
Hamilton 1025 | NERA 50%
LIABILITIES AND PARTNERS' CAPITAL
Partners' Capital % - NERA	50.00%
Investment in Unconsolidated Joint Ventures	$ 1,051,759	$ 2,097,151
Hamilton 1025 | Residential buildings
Total units/ condominiums
Total | item	175	175		175
Hamilton 1025 | Commercial
Total units/ condominiums
Total | item	1	1		1
Hamilton Bay Sales
ASSETS
Rental Properties		$ 140,635		$ 573,138
Cash & Cash Equivalents		18,576		7,728
Rent Receivable		2,452
Real Estate Tax Escrow		0
Prepaid Expenses & Other Assets		1,540		12,879
Total Assets		163,203		593,745
LIABILITIES AND PARTNERS' CAPITAL
Accounts Payable and Accrued Expenses		3,137		12,605
Advance Rental Payments and Security Deposits		1,822		5,799
Total Liabilities		4,959		18,404
Partners' Capital		158,244		575,341
Total Liabilities and Capital		$ 163,203		$ 593,745
Partners' Capital % - NERA		50.00%		50.00%
Investment in Unconsolidated Joint Ventures				$ 287,671
Total units/ condominiums
Total | item	120	120		120
Units to be sold | item	120	120		120
Units sold | item			120	115	119
Unsold units | item				5	1
Units unsold with deposits for future sale | item		1		2
Hamilton Bay Sales | NERA 50%
LIABILITIES AND PARTNERS' CAPITAL
Partners' Capital % - NERA	50.00%
Investment in Unconsolidated Joint Ventures		$ 79,122
Hamilton Bay Sales | Residential buildings
Total units/ condominiums
Total | item	120	120		120
Hamilton Bay Apts
ASSETS
Rental Properties		$ 5,929,749		$ 6,174,512
Assets held for sales	$ 2,365,620
Cash & Cash Equivalents	448,952	923		545
Rent Receivable	9,199	5,520		241
Real Estate Tax Escrow		47,308		51,218
Prepaid Expenses & Other Assets	315,996	79,474		63,345
Total Assets	3,139,767	6,062,974		6,289,861
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable				4,497,183
Accounts Payable and Accrued Expenses	23,049	12,277		14,594
Advance Rental Payments and Security Deposits	19,365	82,693		95,552
Total Liabilities	42,414	4,525,544		4,607,329
Partners' Capital	3,097,353	1,537,430		1,682,532
Total Liabilities and Capital	$ 3,139,767	$ 6,062,974		$ 6,289,861
Partners' Capital % - NERA		50.00%		50.00%			50.00%
Investment in Unconsolidated Joint Ventures				$ 841,266			$ 2,500,000,000,000
Total units/ condominiums
Total | item	48	48		48			168
Units to be retained | item		0		48			(48)
Units to be sold | item	48	48
Units sold | item	29		31				120
Unsold units | item			17
Units unsold with deposits for future sale | item			4
Hamilton Bay Apts | NERA 50%
LIABILITIES AND PARTNERS' CAPITAL
Partners' Capital % - NERA	50.00%
Investment in Unconsolidated Joint Ventures	$ 1,548,676	$ 768,714
Hamilton Bay Apts | Residential buildings
Total units/ condominiums
Total | item	48	48		48
Hamilton Minuteman
ASSETS
Rental Properties	$ 5,870,833	$ 6,165,266		$ 6,352,363
Cash & Cash Equivalents	88,436	47,795		39,184
Rent Receivable	2,121			668
Real Estate Tax Escrow	28,519	18,198		40,499
Prepaid Expenses & Other Assets	25,703	26,473		41,201
Total Assets	6,015,612	6,257,732		6,473,915
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable	5,887,818			5,208,820
Accounts Payable and Accrued Expenses	49,540	50,643		55,116
Advance Rental Payments and Security Deposits	76,426	120,096		113,084
Total Liabilities	6,013,784	6,050,373		5,377,020
Partners' Capital	1,828	207,359		1,096,895
Total Liabilities and Capital	$ 6,015,612	$ 6,257,732		$ 6,473,915
Partners' Capital % - NERA		50.00%		50.00%					50.00%
Investment in Unconsolidated Joint Ventures				$ 548,448					$ 5,075,000
Total units/ condominiums
Total | item	42	42		42					42
Units to be retained | item	42	42		42
Hamilton Minuteman | NERA 50%
LIABILITIES AND PARTNERS' CAPITAL
Partners' Capital % - NERA	50.00%
Investment in Unconsolidated Joint Ventures	$ 913	$ 103,679
Hamilton Minuteman | Residential buildings
Total units/ condominiums
Total | item	42	42		42
Hamilton on Main Apts
ASSETS
Rental Properties	$ 17,568,730	$ 17,773,858		$ 18,574,474
Cash & Cash Equivalents	145,149	95,294		235,748
Rent Receivable	14,879	6,133		11,684
Real Estate Tax Escrow	183,649	189,239		81,815
Prepaid Expenses & Other Assets	71,449	75,324		67,496
Total Assets	17,983,856	18,139,848		18,971,217
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable	16,792,991			16,760,889
Accounts Payable and Accrued Expenses	137,282	157,812		216,091
Advance Rental Payments and Security Deposits	361,677	347,446		328,675
Total Liabilities	17,291,950	17,282,198		17,305,655
Partners' Capital	691,906	857,650		1,665,562
Total Liabilities and Capital	$ 17,983,856	$ 18,139,848		$ 18,971,217
Partners' Capital % - NERA		50.00%		50.00%						50.00%
Investment in Unconsolidated Joint Ventures				$ 832,780						$ 8,000,000
Total units/ condominiums
Total | item	148	148		148						280
Units to be retained | item	148	148		148
Hamilton on Main Apts | NERA 50%
LIABILITIES AND PARTNERS' CAPITAL
Partners' Capital % - NERA	50.00%
Investment in Unconsolidated Joint Ventures	$ 345,952	$ 428,824
Hamilton on Main Apts | Residential buildings
Total units/ condominiums
Total | item	148	148		148
Dexter Park
ASSETS
Rental Properties	$ 89,746,236	$ 91,943,516		$ 94,250,027
Cash & Cash Equivalents	969,064	1,496,250		1,186,144
Rent Receivable	152,759	204,956		66,818
Real Estate Tax Escrow	316,132	211,494		210,446
Prepaid Expenses & Other Assets	1,291,561	1,627,342		1,898,655
Total Assets	92,475,752	95,483,558		97,612,090
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable	81,898,222			84,680,020
Accounts Payable and Accrued Expenses	750,666	673,585		792,707
Advance Rental Payments and Security Deposits	2,469,208	2,667,408		2,482,079
Total Liabilities	85,118,096	86,677,572		87,954,806
Partners' Capital	7,357,656	8,805,986		9,657,284
Total Liabilities and Capital	$ 92,475,752	$ 95,483,558		$ 97,612,090
Partners' Capital % - NERA		40.00%		40.00%		40.00%
Investment in Unconsolidated Joint Ventures				$ 3,862,912		$ 15,925,000
Total units/ condominiums
Total | item	409	409		409
Units to be retained | item	409	409		409
Dexter Park | NERA 40%
LIABILITIES AND PARTNERS' CAPITAL
Partners' Capital % - NERA	40.00%
Investment in Unconsolidated Joint Ventures	$ 2,943,060	$ 3,522,393
Dexter Park | Residential buildings
Total units/ condominiums
Total | item	409	409		409