INVESTMENT IN UNCONSOLIDATED JOINT VENTURES (Balance Sheet) (Details)	Sep. 30, 2017 USD ($) property item	Dec. 31, 2016 USD ($) item	Sep. 30, 2016 USD ($) property	Oct. 28, 2009 USD ($) item	Oct. 03, 2005 USD ($) item	Mar. 07, 2005 item	Mar. 02, 2005 USD ($) item	Sep. 30, 2004 USD ($) item	Aug. 31, 2004 USD ($) item	Nov. 30, 2001 USD ($) item
LIABILITIES AND PARTNERS' CAPITAL
Investment in Unconsolidated Joint Ventures	$ 8,452,484	$ 8,336,505
Distribution and Loss in Excess of investments in Unconsolidated Joint Venture	(2,737,854)	$ (2,577,606)
Investment Properties
ASSETS
Rental Properties	136,236,448		$ 144,074,716
Cash & Cash Equivalents	1,868,209		1,875,141
Rent Receivable	212,781		431,805
Real Estate Tax Escrow	692,490		1,221,204
Prepaid Expenses & Other Assets	2,926,955		2,446,530
Total Assets	141,936,883		150,049,396
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable	124,550,899		130,551,992
Accounts Payable and Accrued Expenses	1,249,412		1,080,567
Advance Rental Payments and Security Deposits	3,250,170		3,615,158
Total Liabilities	129,050,481		135,247,717
Partners' Capital	12,886,402		14,801,679
Total Liabilities and Capital	141,936,883		150,049,396
Investment in Unconsolidated Joint Ventures	8,452,484		8,970,289
Distribution and Loss in Excess of investments in Unconsolidated Joint Venture	(2,737,854)		(2,481,546)
Total Investment in Unconsolidated Joint Ventures (Net)	$ 5,714,630		$ 6,488,743
Total units/ condominiums
Total | property	1,033		1,033
Units to be retained | property	690		689
Units to be sold | property	343		344
Units sold | property	297		252
Unsold units | property	46		44
Units unsold with deposits for future sale | property	10		3
Investment Properties | Residential buildings
Total units/ condominiums
Total | property	1,030		1,030
Investment Properties | Commercial
Total units/ condominiums
Total | property	3		3
Hamilton Essex 81
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable	$ 9,889,687
Total units/ condominiums
Total | item						48
Hamilton Essex 81 | NERA 50%
ASSETS
Rental Properties	7,704,425		$ 8,129,487
Cash & Cash Equivalents	147,083		142,274
Rent Receivable	17,530		49,547
Real Estate Tax Escrow	103,996		81,827
Prepaid Expenses & Other Assets	120,823		172,746
Total Assets	8,093,857		8,575,881
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable	9,889,687		9,875,898
Accounts Payable and Accrued Expenses	90,779		59,117
Advance Rental Payments and Security Deposits	179,143		225,843
Total Liabilities	10,159,609		10,160,858
Partners' Capital	(2,065,752)		(1,584,977)
Total Liabilities and Capital	$ 8,093,857		$ 8,575,881
Partners' Capital % - NERA	50.00%		50.00%
Distribution and Loss in Excess of investments in Unconsolidated Joint Venture	$ (1,032,876)		$ (792,488)
Total units/ condominiums
Total | property	49		49
Units to be retained | property	49		49
Hamilton Essex 81 | Residential buildings | NERA 50%
Total units/ condominiums
Total | property	48		48
Hamilton Essex 81 | Commercial | NERA 50%
Total units/ condominiums
Total | property	1		1
Hamilton Essex Development | NERA 50%
ASSETS
Rental Properties	$ 2,622,401		$ 2,616,545
Cash & Cash Equivalents	92,180		52,323
Prepaid Expenses & Other Assets	1,115		982
Total Assets	2,715,696		2,669,850
LIABILITIES AND PARTNERS' CAPITAL
Accounts Payable and Accrued Expenses	1,276		1,275
Total Liabilities	1,276		1,275
Partners' Capital	2,714,420		2,668,575
Total Liabilities and Capital	$ 2,715,696		$ 2,669,850
Partners' Capital % - NERA	50.00%		50.00%
Investment in Unconsolidated Joint Ventures	$ 1,357,209		$ 1,334,288
Total units/ condominiums
Total | property	1		1
Units to be retained | property	1		1
Hamilton Essex Development | Commercial | NERA 50%
Total units/ condominiums
Total | property	1		1
345 Franklin
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable	$ 9,717,606
Partners' Capital % - NERA										50.00%
Investment in Unconsolidated Joint Ventures										$ 1,533,000
Total units/ condominiums
Total | item										40
345 Franklin | NERA 50%
ASSETS
Rental Properties	6,408,017		$ 6,521,385
Cash & Cash Equivalents	67,653		199,544
Rent Receivable	32,797		18,009
Real Estate Tax Escrow	47,566		45,014
Prepaid Expenses & Other Assets	59,633		54,156
Total Assets	6,615,666		6,838,108
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable	9,717,606		9,892,225
Accounts Payable and Accrued Expenses	78,848		78,095
Advance Rental Payments and Security Deposits	229,169		245,904
Total Liabilities	10,025,623		10,216,224
Partners' Capital	(3,409,957)		(3,378,116)
Total Liabilities and Capital	$ 6,615,666		$ 6,838,108
Partners' Capital % - NERA	50.00%		50.00%
Distribution and Loss in Excess of investments in Unconsolidated Joint Venture	$ (1,704,978)		$ (1,689,058)
Total units/ condominiums
Total | property	40		40
Units to be retained | property	40		40
345 Franklin | Residential buildings | NERA 50%
Total units/ condominiums
Total | property	40		40
Hamilton 1025
LIABILITIES AND PARTNERS' CAPITAL
Partners' Capital % - NERA							50.00%
Investment in Unconsolidated Joint Ventures							$ 2,352,000
Total units/ condominiums
Total | item							176
Units to be retained | item	(4)						(49)
Units sold | item	15	10					127
Unsold units | item	20
Hamilton 1025 | NERA 50%
ASSETS
Rental Properties	$ 2,155,441		$ 4,074,383
Cash & Cash Equivalents	200,845		155,921
Rent Receivable	10,388		35,302
Real Estate Tax Escrow			659,841
Prepaid Expenses & Other Assets	704,019		0
Total Assets	3,070,693		4,925,447
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable			0
Accounts Payable and Accrued Expenses	35,139		51,206
Advance Rental Payments and Security Deposits	25,656		79,732
Total Liabilities	60,795		130,938
Partners' Capital	3,009,898		4,794,509
Total Liabilities and Capital	$ 3,070,693		$ 4,925,447
Partners' Capital % - NERA	50.00%		50.00%
Investment in Unconsolidated Joint Ventures	$ 1,504,948		$ 2,397,254
Total units/ condominiums
Total | property	176		176
Units to be retained | property	1		0
Units to be sold | property	175		176
Units sold | property	155		133
Unsold units | property	20		43
Units unsold with deposits for future sale | property	4		3
Hamilton 1025 | Residential buildings | NERA 50%
Total units/ condominiums
Total | property	175		175
Hamilton 1025 | Commercial | NERA 50%
Total units/ condominiums
Total | property	1		1
Hamilton Bay Sales | NERA 50%
ASSETS
Rental Properties	$ 0		$ 124,752
Cash & Cash Equivalents	20,890		97,332
Rent Receivable	1,480		3,000
Real Estate Tax Escrow			171
Prepaid Expenses & Other Assets	263		0
Total Assets	22,633		225,255
LIABILITIES AND PARTNERS' CAPITAL
Accounts Payable and Accrued Expenses	1,671		3,947
Advance Rental Payments and Security Deposits	101		2,380
Total Liabilities	1,772		6,327
Partners' Capital	20,861		218,928
Total Liabilities and Capital	$ 22,633		$ 225,255
Partners' Capital % - NERA	50.00%		50.00%
Investment in Unconsolidated Joint Ventures	$ 10,430		$ 109,464
Total units/ condominiums
Total | property	120		120
Units to be sold | property	120		120
Units sold | property	120		119
Unsold units | property			1
Hamilton Bay Sales | Residential buildings | NERA 50%
Total units/ condominiums
Total | property	120		120
Hamilton Bay Apts
LIABILITIES AND PARTNERS' CAPITAL
Partners' Capital % - NERA					50.00%
Investment in Unconsolidated Joint Ventures					$ 2,500,000
Total units/ condominiums
Total | item					168
Units to be retained | item					(48)
Units sold | item					120
Hamilton Bay Apts | NERA 50%
ASSETS
Rental Properties	$ 3,438,875		$ 5,956,617
Cash & Cash Equivalents	583,983		1,121
Rent Receivable	7,110		15,687
Real Estate Tax Escrow	0		44,049
Prepaid Expenses & Other Assets	501,895		78,234
Total Assets	4,531,863		6,095,708
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable			4,447,269
Accounts Payable and Accrued Expenses	28,806		9,809
Advance Rental Payments and Security Deposits	25,355		93,716
Total Liabilities	54,161		4,550,794
Partners' Capital	4,477,702		1,544,914
Total Liabilities and Capital	$ 4,531,863		$ 6,095,708
Partners' Capital % - NERA	50.00%		50.00%
Investment in Unconsolidated Joint Ventures	$ 2,238,850		$ 772,457
Total units/ condominiums
Total | property	48		48
Units to be retained | property			0
Units to be sold | property	48		48
Units sold | property	22
Unsold units | property	26
Units unsold with deposits for future sale | property	6
Hamilton Bay Apts | Residential buildings | NERA 50%
Total units/ condominiums
Total | property	48		48
Hamilton Minuteman
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable	$ 5,885,772
Partners' Capital % - NERA								50.00%
Investment in Unconsolidated Joint Ventures								$ 5,075,000
Total units/ condominiums
Total | item								42
Hamilton Minuteman | NERA 50%
ASSETS
Rental Properties	5,953,334		$ 6,206,120
Cash & Cash Equivalents	55,114		89,502
Rent Receivable	4,291		980
Real Estate Tax Escrow	22,865		37,762
Prepaid Expenses & Other Assets	34,110		67,687
Total Assets	6,069,714		6,402,051
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable	5,885,772		5,877,338
Accounts Payable and Accrued Expenses	68,147		42,713
Advance Rental Payments and Security Deposits	96,224		112,168
Total Liabilities	6,050,143		6,032,219
Partners' Capital	19,571		369,832
Total Liabilities and Capital	$ 6,069,714		$ 6,402,051
Partners' Capital % - NERA	50.00%		50.00%
Investment in Unconsolidated Joint Ventures	$ 9,785		$ 184,916
Total units/ condominiums
Total | property	42		42
Units to be retained | property	42		42
Hamilton Minuteman | Residential buildings | NERA 50%
Total units/ condominiums
Total | property	42		42
Hamilton on Main Apts
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable	$ 16,788,979
Partners' Capital % - NERA									50.00%
Investment in Unconsolidated Joint Ventures									$ 8,000,000
Total units/ condominiums
Total | item									280
Units sold | item									137
Hamilton on Main Apts | NERA 50%
ASSETS
Rental Properties	17,776,990		$ 17,972,191
Cash & Cash Equivalents	33,918		100,273
Rent Receivable	16,545		20,473
Real Estate Tax Escrow	220,804		135,659
Prepaid Expenses & Other Assets	99,569		94,299
Total Assets	18,147,826		18,322,895
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable	16,788,979		16,772,927
Accounts Payable and Accrued Expenses	159,754		140,981
Advance Rental Payments and Security Deposits	365,091		361,929
Total Liabilities	17,313,824		17,275,837
Partners' Capital	834,002		1,047,058
Total Liabilities and Capital	$ 18,147,826		$ 18,322,895
Partners' Capital % - NERA	50.00%		50.00%
Investment in Unconsolidated Joint Ventures	$ 417,001		$ 523,529
Total units/ condominiums
Total | property	148		148
Units to be retained | property	148		148
Hamilton on Main Apts | Residential buildings | NERA 50%
Total units/ condominiums
Total | property	148		148
Dexter Park
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable	$ 82,268,855
Partners' Capital % - NERA				40.00%
Investment in Unconsolidated Joint Ventures				$ 15,925,000
Total units/ condominiums
Total | item				409
Dexter Park | NERA 40%
ASSETS
Rental Properties	90,176,965		$ 92,473,236
Cash & Cash Equivalents	666,543		1,036,851
Rent Receivable	122,640		288,807
Real Estate Tax Escrow	297,259		216,881
Prepaid Expenses & Other Assets	1,405,528		1,978,426
Total Assets	92,668,935		95,994,201
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable	82,268,855		83,686,335
Accounts Payable and Accrued Expenses	784,992		693,424
Advance Rental Payments and Security Deposits	2,329,431		2,493,486
Total Liabilities	85,383,278		86,873,245
Partners' Capital	7,285,657		9,120,956
Total Liabilities and Capital	$ 92,668,935		$ 95,994,201
Partners' Capital % - NERA	40.00%		40.00%
Investment in Unconsolidated Joint Ventures	$ 2,914,262		$ 3,648,382
Total units/ condominiums
Total | property	409		409
Units to be retained | property	409		409
Dexter Park | Residential buildings | NERA 40%
Total units/ condominiums
Total | property	409		409