INVESTMENT IN UNCONSOLIDATED JOINT VENTURES (Balance Sheet) (Details)	Jun. 30, 2018 USD ($) property item	Dec. 31, 2017 USD ($) item	Jun. 30, 2017 USD ($) item	Oct. 28, 2009 USD ($) 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
ASSETS
Rental Properties			$ 138,765,415
Cash & Cash Equivalents			1,523,954
Rent Receivable			226,448
Real Estate Tax Escrow			661,767
Prepaid Expenses & Other Assets			3,207,143
Total Assets			144,384,727
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable			124,938,378
Accounts Payable and Accrued Expenses			1,006,173
Advance Rental Payments and Security Deposits			4,479,127
Total Liabilities			130,423,678
Partners' Capital			13,961,049
Total Liabilities and Capital			144,384,727
Investment in Unconsolidated Joint Ventures	$ 2,298,588	$ 7,212,044	9,029,233
Distribution and Loss in Excess of investments in Unconsolidated Joint Venture	(17,487,770)	$ (2,806,319)	(2,754,771)
Total Investment in Unconsolidated Joint Ventures (Net)			$ 6,274,462
Total units/ condominiums
Total | item			1,033
Units to be retained | item			690
Units to be sold | item			343
Units sold | item			278
Unsold units | item			65
Units unsold with deposits for future sale | item			13
Residential buildings
Total units/ condominiums
Total | item			1,030
Commercial
Total units/ condominiums
Total | item			3
Investment Properties
ASSETS
Rental Properties	129,054,191
Cash & Cash Equivalents	2,619,397
Rent Receivable	369,238
Real Estate Tax Escrow	247,273
Prepaid Expenses & Other Assets	1,802,845
Total Assets	134,092,944
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable	166,538,840
Accounts Payable and Accrued Expenses	1,243,220
Advance Rental Payments and Security Deposits	3,935,615
Total Liabilities	171,717,675
Partners' Capital	(37,624,731)
Total Liabilities and Capital	134,092,944
Investment in Unconsolidated Joint Ventures	2,298,596
Distribution and Loss in Excess of investments in Unconsolidated Joint Venture	(17,487,771)
Total Investment in Unconsolidated Joint Ventures (Net)	$ (15,189,175)
Total units/ condominiums
Total | property	1,033
Units to be retained | property	690
Units to be sold | property	343
Units sold | property	215
Unsold units | property	8
Units unsold with deposits for future sale | property	3
Investment Properties | Residential buildings
Total units/ condominiums
Total | property	1,030
Investment Properties | Commercial
Total units/ condominiums
Total | property	3
Hamilton Essex 81
ASSETS
Rental Properties			$ 7,798,556
Cash & Cash Equivalents			95,520
Rent Receivable			5,529
Real Estate Tax Escrow			111,718
Prepaid Expenses & Other Assets			105,580
Total Assets			8,116,903
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable	$ 9,900,029		9,886,240
Accounts Payable and Accrued Expenses			62,932
Advance Rental Payments and Security Deposits			251,183
Total Liabilities			10,200,355
Partners' Capital			(2,083,452)
Total Liabilities and Capital			$ 8,116,903
Partners' Capital % - NERA			50.00%
Distribution and Loss in Excess of investments in Unconsolidated Joint Venture			$ (1,041,726)
Total units/ condominiums
Total | item			49			48
Units to be retained | item			49
Hamilton Essex 81 | NERA 50%
ASSETS
Rental Properties	7,423,918
Cash & Cash Equivalents	31,634
Rent Receivable	129,344
Real Estate Tax Escrow	71,977
Prepaid Expenses & Other Assets	251,866
Total Assets	7,908,739
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable	9,900,029
Accounts Payable and Accrued Expenses	71,839
Advance Rental Payments and Security Deposits	315,075
Total Liabilities	10,286,943
Partners' Capital	(2,378,204)
Total Liabilities and Capital	$ 7,908,739
Partners' Capital % - NERA	50.00%
Distribution and Loss in Excess of investments in Unconsolidated Joint Venture	$ (1,189,102)
Total units/ condominiums
Total | property	49
Units to be retained | property	49
Hamilton Essex 81 | Residential buildings
Total units/ condominiums
Total | item			48
Hamilton Essex 81 | Residential buildings | NERA 50%
Total units/ condominiums
Total | property	48
Hamilton Essex 81 | Commercial
Total units/ condominiums
Total | item			1
Hamilton Essex 81 | Commercial | NERA 50%
Total units/ condominiums
Total | property	1
Hamilton Essex Development
ASSETS
Rental Properties			$ 2,622,021
Cash & Cash Equivalents			108,751
Prepaid Expenses & Other Assets			1,533
Total Assets			2,732,305
LIABILITIES AND PARTNERS' CAPITAL
Accounts Payable and Accrued Expenses			850
Total Liabilities			850
Partners' Capital			2,731,455
Total Liabilities and Capital			$ 2,732,305
Partners' Capital % - NERA			50.00%
Investment in Unconsolidated Joint Ventures			$ 1,365,727
Total units/ condominiums
Total | item			1
Units to be retained | item			1
Hamilton Essex Development | NERA 50%
ASSETS
Rental Properties	$ 2,596,968
Cash & Cash Equivalents	50,705
Prepaid Expenses & Other Assets	0
Total Assets	2,647,673
LIABILITIES AND PARTNERS' CAPITAL
Accounts Payable and Accrued Expenses	1,689
Total Liabilities	1,689
Partners' Capital	2,645,984
Total Liabilities and Capital	$ 2,647,673
Partners' Capital % - NERA	50.00%
Investment in Unconsolidated Joint Ventures	$ 1,322,992
Total units/ condominiums
Total | property	1
Units to be retained | property	1
Hamilton Essex Development | Commercial
Total units/ condominiums
Total | item			1
Hamilton Essex Development | Commercial | NERA 50%
Total units/ condominiums
Total | property	1
345 Franklin
ASSETS
Rental Properties			$ 6,494,266
Cash & Cash Equivalents			45,291
Rent Receivable			9,470
Real Estate Tax Escrow			18,889
Prepaid Expenses & Other Assets			42,394
Total Assets			6,610,310
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable	$ 9,581,970		9,761,919
Accounts Payable and Accrued Expenses			63,851
Advance Rental Payments and Security Deposits			210,629
Total Liabilities			10,036,399
Partners' Capital			(3,426,089)
Total Liabilities and Capital			$ 6,610,310
Partners' Capital % - NERA			50.00%							50.00%
Investment in Unconsolidated Joint Ventures										$ 1,533,000
Distribution and Loss in Excess of investments in Unconsolidated Joint Venture			$ (1,713,045)
Total units/ condominiums
Total | item			40							40
Units to be retained | item			40
345 Franklin | NERA 50%
ASSETS
Rental Properties	6,164,547
Cash & Cash Equivalents	156,033
Rent Receivable	20,500
Real Estate Tax Escrow	19,053
Prepaid Expenses & Other Assets	54,421
Total Assets	6,414,554
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable	9,581,970
Accounts Payable and Accrued Expenses	75,750
Advance Rental Payments and Security Deposits	267,765
Total Liabilities	9,925,485
Partners' Capital	(3,510,931)
Total Liabilities and Capital	$ 6,414,554
Partners' Capital % - NERA	50.00%
Distribution and Loss in Excess of investments in Unconsolidated Joint Venture	$ (1,755,466)
Total units/ condominiums
Total | property	40
Units to be retained | property	40
345 Franklin | Residential buildings
Total units/ condominiums
Total | item			40
345 Franklin | Residential buildings | NERA 50%
Total units/ condominiums
Total | property	40
Hamilton 1025
ASSETS
Rental Properties			$ 2,812,552
Cash & Cash Equivalents			684
Rent Receivable			10,842
Prepaid Expenses & Other Assets			770,237
Total Assets			3,594,315
LIABILITIES AND PARTNERS' CAPITAL
Accounts Payable and Accrued Expenses			10,978
Advance Rental Payments and Security Deposits			42,231
Total Liabilities			53,209
Partners' Capital			3,541,106
Total Liabilities and Capital			$ 3,594,315
Partners' Capital % - NERA			50.00%				50.00%
Investment in Unconsolidated Joint Ventures			$ 1,770,552				$ 2,352,000
Total units/ condominiums
Total | item	6		176				176
Units to be retained | item			0				(49)
Units to be sold | item			176
Units sold | item	12	20	148				127
Unsold units | item			27
Units unsold with deposits for future sale | item			4
Hamilton 1025 | NERA 50%
ASSETS
Rental Properties	$ 511,297
Cash & Cash Equivalents	41,589
Rent Receivable	9,073
Prepaid Expenses & Other Assets	84,892
Total Assets	646,851
LIABILITIES AND PARTNERS' CAPITAL
Accounts Payable and Accrued Expenses	12,318
Advance Rental Payments and Security Deposits	10,204
Total Liabilities	22,522
Partners' Capital	624,329
Total Liabilities and Capital	$ 646,851
Partners' Capital % - NERA	50.00%
Investment in Unconsolidated Joint Ventures	$ 312,165
Total units/ condominiums
Total | property	176
Units to be sold | property	175
Units sold | property	171
Unsold units | property	4
Units unsold with deposits for future sale | property	1
Hamilton 1025 | Residential buildings
Total units/ condominiums
Total | item			175
Hamilton 1025 | Residential buildings | NERA 50%
Total units/ condominiums
Total | property	175
Hamilton 1025 | Commercial
Total units/ condominiums
Total | item			1
Hamilton 1025 | Commercial | NERA 50%
Total units/ condominiums
Total | property	1
Hamilton Bay Sales
ASSETS
Rental Properties			$ 0
Cash & Cash Equivalents			212,237
Rent Receivable			825
Total Assets			213,062
LIABILITIES AND PARTNERS' CAPITAL
Accounts Payable and Accrued Expenses			1,182
Advance Rental Payments and Security Deposits			101
Total Liabilities			1,283
Partners' Capital			211,779
Total Liabilities and Capital			$ 213,062
Partners' Capital % - NERA			50.00%
Investment in Unconsolidated Joint Ventures			$ 105,890
Total units/ condominiums
Total | item			120
Units to be sold | item			120
Units sold | item			120
Unsold units | item			0
Hamilton Bay Sales | Residential buildings
Total units/ condominiums
Total | item			120
Hamilton Bay Apts
ASSETS
Rental Properties			$ 4,484,449
Cash & Cash Equivalents			58,078
Rent Receivable			18,180
Prepaid Expenses & Other Assets			487,987
Total Assets			5,048,694
LIABILITIES AND PARTNERS' CAPITAL
Accounts Payable and Accrued Expenses			35,122
Advance Rental Payments and Security Deposits			65,705
Total Liabilities			100,827
Partners' Capital			4,947,867
Total Liabilities and Capital			$ 5,048,694
Partners' Capital % - NERA			50.00%		50.00%
Investment in Unconsolidated Joint Ventures			$ 2,473,933		$ 2,500,000
Total units/ condominiums
Total | item			48		168
Units to be retained | item			0		(48)
Units to be sold | item			46
Units sold | item			10		120
Unsold units | item			38
Units unsold with deposits for future sale | item			9
Hamilton Bay Apts | NERA 50%
ASSETS
Rental Properties	$ 769,567
Cash & Cash Equivalents	130,503
Rent Receivable	0
Real Estate Tax Escrow	0
Prepaid Expenses & Other Assets	141,234
Total Assets	1,041,304
LIABILITIES AND PARTNERS' CAPITAL
Accounts Payable and Accrued Expenses	8,203
Advance Rental Payments and Security Deposits	6,012
Total Liabilities	14,215
Partners' Capital	1,027,089
Total Liabilities and Capital	$ 1,041,304
Partners' Capital % - NERA	50.00%
Investment in Unconsolidated Joint Ventures	$ 513,544
Total units/ condominiums
Total | property	48
Units to be sold | property	48
Units sold | property	44
Unsold units | property	4
Units unsold with deposits for future sale | property	2
Hamilton Bay Apts | Residential buildings
Total units/ condominiums
Total | item			48
Hamilton Bay Apts | Residential buildings | NERA 50%
Total units/ condominiums
Total | property	48
Hamilton Minuteman
ASSETS
Rental Properties			$ 6,012,338
Cash & Cash Equivalents			27,620
Rent Receivable			10,991
Real Estate Tax Escrow			19,216
Prepaid Expenses & Other Assets			23,196
Total Assets			6,093,361
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable	$ 5,891,909		5,883,726
Accounts Payable and Accrued Expenses			48,956
Advance Rental Payments and Security Deposits			119,247
Total Liabilities			6,051,929
Partners' Capital			41,432
Total Liabilities and Capital			$ 6,093,361
Partners' Capital % - NERA			50.00%					50.00%
Investment in Unconsolidated Joint Ventures			$ 20,716					$ 5,075,000
Total units/ condominiums
Total | item			42					42
Units to be retained | item			42
Hamilton Minuteman | NERA 50%
ASSETS
Rental Properties	5,778,394
Cash & Cash Equivalents	121,001
Rent Receivable	32,219
Real Estate Tax Escrow	34,327
Prepaid Expenses & Other Assets	11,824
Total Assets	5,977,765
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable	5,891,909
Accounts Payable and Accrued Expenses	61,704
Advance Rental Payments and Security Deposits	125,039
Total Liabilities	6,078,652
Partners' Capital	(100,887)
Total Liabilities and Capital	$ 5,977,765
Partners' Capital % - NERA	50.00%
Distribution and Loss in Excess of investments in Unconsolidated Joint Venture	$ (50,444)
Total units/ condominiums
Total | property	42
Units to be retained | property	42
Hamilton Minuteman | Residential buildings
Total units/ condominiums
Total | item			42
Hamilton Minuteman | Residential buildings | NERA 50%
Total units/ condominiums
Total | property	42
Hamilton on Main Apts
ASSETS
Rental Properties			$ 17,871,657
Cash & Cash Equivalents			541
Rent Receivable			20,212
Real Estate Tax Escrow			238,391
Prepaid Expenses & Other Assets			108,507
Total Assets			18,239,308
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable	$ 16,801,017		16,784,966
Accounts Payable and Accrued Expenses			140,046
Advance Rental Payments and Security Deposits			377,911
Total Liabilities			17,302,923
Partners' Capital			936,385
Total Liabilities and Capital			$ 18,239,308
Partners' Capital % - NERA			50.00%						50.00%
Investment in Unconsolidated Joint Ventures			$ 468,192						$ 8,000,000
Total units/ condominiums
Total | item			148						280
Units to be retained | item			148
Units sold | item									137
Hamilton on Main Apts | NERA 50%
ASSETS
Rental Properties	17,135,093
Cash & Cash Equivalents	236,201
Rent Receivable	26,072
Real Estate Tax Escrow	121,916
Prepaid Expenses & Other Assets	88,307
Total Assets	17,607,589
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable	16,801,017
Accounts Payable and Accrued Expenses	163,091
Advance Rental Payments and Security Deposits	343,691
Total Liabilities	17,307,799
Partners' Capital	299,790
Total Liabilities and Capital	$ 17,607,589
Partners' Capital % - NERA	50.00%
Investment in Unconsolidated Joint Ventures	$ 149,895
Total units/ condominiums
Total | property	148
Units to be retained | property	148
Hamilton on Main Apts | Residential buildings
Total units/ condominiums
Total | item			148
Hamilton on Main Apts | Residential buildings | NERA 50%
Total units/ condominiums
Total | property	148
Dexter Park
ASSETS
Rental Properties			$ 90,669,576
Cash & Cash Equivalents			975,232
Rent Receivable			150,399
Real Estate Tax Escrow			273,553
Prepaid Expenses & Other Assets			1,667,709
Total Assets			93,736,469
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable	$ 124,363,915		82,621,527
Accounts Payable and Accrued Expenses			642,256
Advance Rental Payments and Security Deposits			3,412,120
Total Liabilities			86,675,903
Partners' Capital			7,060,566
Total Liabilities and Capital			$ 93,736,469
Partners' Capital % - NERA			40.00%	40.00%
Investment in Unconsolidated Joint Ventures			$ 2,824,225	$ 15,925,000
Total units/ condominiums
Total | item			409	409
Units to be retained | item			409
Dexter Park | NERA 40%
ASSETS
Rental Properties	88,674,407
Cash & Cash Equivalents	1,851,731
Rent Receivable	152,030
Real Estate Tax Escrow	0
Prepaid Expenses & Other Assets	1,170,301
Total Assets	91,848,469
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable	124,363,915
Accounts Payable and Accrued Expenses	848,626
Advance Rental Payments and Security Deposits	2,867,829
Total Liabilities	128,080,370
Partners' Capital	(36,231,901)
Total Liabilities and Capital	$ 91,848,469
Partners' Capital % - NERA	40.00%
Distribution and Loss in Excess of investments in Unconsolidated Joint Venture	$ (14,492,760)
Total units/ condominiums
Total | property	409
Units to be retained | property	409
Dexter Park | Residential buildings
Total units/ condominiums
Total | item			409
Dexter Park | Residential buildings | NERA 40%
Total units/ condominiums
Total | property	409