INVESTMENT IN UNCONSOLIDATED JOINT VENTURES (Balance Sheet) (Details)	Dec. 31, 2018 USD ($) item	Dec. 31, 2017 USD ($) item	Dec. 31, 2016 USD ($) item	Oct. 28, 2009 USD ($)	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	$ 125,170,859	$ 129,725,326	$ 142,881,344
Assets held for sales	645,137	4,036,272
Cash & Cash Equivalents	2,960,323	2,183,047	2,081,578
Rent Receivable	534,504	216,622	265,073
Real Estate Tax Escrow	219,004	642,015	612,537
Prepaid Expenses & Other Assets	1,710,791	2,198,753	2,361,142
Total Assets	131,240,618	139,002,035	148,201,674
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable	166,492,692	124,145,012	130,152,298
Accounts Payable and Accrued Expenses	1,396,458	1,087,616	1,033,761
Advance Rental Payments and Security Deposits	3,592,174	3,486,413	3,736,609
Total Liabilities	171,481,324	128,719,041	134,922,668
Partners' Capital	(40,240,706)	10,282,994	13,279,006
Total Liabilities and Capital	131,240,618	139,002,035	148,201,674
Investment in Unconsolidated Joint Ventures	1,985,680	7,212,044	8,336,505
Distribution and Loss in Excess of investments in Unconsolidated Joint Venture	(18,351,562)	(2,806,319)	(2,577,606)
Total Investment in Unconsolidated Joint Ventures (Net)	$ (16,365,882)	$ 4,405,725	$ 5,758,899
Total units/ condominiums
Total | item	1,033	1,033	1,033
Units to be retained | item	689	689	689
Units to be sold | item	344	344	344
Total number of units sold | item	341	310	258
Unsold units | item	3	34	38
Units unsold with deposits for future sale | item	1	11	6
NERA 50%
LIABILITIES AND PARTNERS' CAPITAL
Partners' Capital % - NERA		50.00%
NERA 40%
LIABILITIES AND PARTNERS' CAPITAL
Partners' Capital % - NERA		40.00%
Residential buildings
Total units/ condominiums
Total | item	1,030	1,030	1,030
Commercial
Total units/ condominiums
Total | item	3	3	3
Hamilton Essex 81
ASSETS
Rental Properties	$ 7,222,446	$ 7,615,554	$ 8,011,942
Cash & Cash Equivalents	131,634	293,801	167,953
Rent Receivable	199,425	21,478	25,604
Real Estate Tax Escrow	71,579	95,544	127,728
Prepaid Expenses & Other Assets	267,028	77,490	96,307
Total Assets	7,892,112	8,103,867	8,429,534
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable	9,906,924	9,893,135	9,879,346
Accounts Payable and Accrued Expenses	196,896	57,811	59,227
Advance Rental Payments and Security Deposits	259,821	313,218	218,582
Total Liabilities	10,363,641	10,264,164	10,157,155
Partners' Capital	(2,471,529)	(2,160,297)	(1,727,621)
Total Liabilities and Capital	$ 7,892,112	$ 8,103,867	$ 8,429,534
Partners' Capital % - NERA	50.00%	50.00%	50.00%
Distribution and Loss in Excess of investments in Unconsolidated Joint Venture	$ (1,235,765)	$ (1,080,148)	$ (863,810)
Total units/ condominiums
Total | item	49	49	49
Units to be retained | item	49	49	49
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	$ 2,595,638	$ 2,598,297	$ 2,622,011
Cash & Cash Equivalents	118,093	46,076	52,321
Rent Receivable	28,329
Prepaid Expenses & Other Assets	115,491	697	615
Total Assets	2,857,551	2,645,070	2,674,947
LIABILITIES AND PARTNERS' CAPITAL
Accounts Payable and Accrued Expenses	1,750	1,700	1,700
Total Liabilities	1,750	1,700	1,700
Partners' Capital	2,855,801	2,643,370	2,673,247
Total Liabilities and Capital	$ 2,857,551	$ 2,645,070	$ 2,674,947
Partners' Capital % - NERA	50.00%	50.00%	50.00%
Investment in Unconsolidated Joint Ventures	$ 1,427,901	$ 1,321,684	$ 1,336,623
Total units/ condominiums
Total | item	1	1	1
Units to be retained | item	1	1	1
Hamilton Essex Development | Commercial
Total units/ condominiums
Total | item	1	1	1
345 Franklin
ASSETS
Rental Properties	$ 6,005,953	$ 6,325,676	$ 6,587,662
Cash & Cash Equivalents	94,349	105,074	57,635
Rent Receivable	6,872	9,057	9,840
Real Estate Tax Escrow	19,863	18,171	18,570
Prepaid Expenses & Other Assets	64,930	53,813	50,553
Total Assets	6,191,967	6,511,791	6,724,260
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable	9,489,257	9,672,846	9,849,225
Accounts Payable and Accrued Expenses	51,932	56,417	65,948
Advance Rental Payments and Security Deposits	249,546	234,870	236,679
Total Liabilities	9,790,735	9,964,133	10,151,852
Partners' Capital	(3,598,768)	(3,452,342)	(3,427,592)
Total Liabilities and Capital	$ 6,191,967	$ 6,511,791	$ 6,724,260
Partners' Capital % - NERA	50.00%	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	$ (1,799,384)	$ (1,726,171)	$ (1,713,796)
Total units/ condominiums
Total | item	40	40	40						40
Units to be retained | item	40	40	40
345 Franklin | Residential buildings
Total units/ condominiums
Total | item	40	40	40
Hamilton 1025
ASSETS
Rental Properties			$ 3,706,705
Assets held for sales	$ 265,622	$ 1,670,652
Cash & Cash Equivalents	125,611	86,495	144,831
Rent Receivable	2,977	7,129	10,568
Prepaid Expenses & Other Assets	22,439	362,044	403,514
Total Assets	416,649	2,126,320	4,265,618
LIABILITIES AND PARTNERS' CAPITAL
Accounts Payable and Accrued Expenses	33,282	11,151	9,432
Advance Rental Payments and Security Deposits	7,187	11,649	61,883
Total Liabilities	40,469	22,800	71,315
Partners' Capital	376,180	2,103,520	4,194,303
Total Liabilities and Capital	$ 416,649	$ 2,126,320	$ 4,265,618
Partners' Capital % - NERA	50.00%	50.00%	50.00%			50.00%
Investment in Unconsolidated Joint Ventures	$ 188,090	$ 1,051,759	$ 2,097,151			$ 2,352,000
Total units/ condominiums
Total | item	176	176	176			176
Units to be retained | item						(49)
Units to be sold | item	176	176	176
Total number of units sold | item	174	159	139
Unsold units | item	2	17	37
Units unsold with deposits for future sale | item	1	7	5
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
Cash & Cash Equivalents			18,576
Rent Receivable			2,452
Real Estate Tax Escrow			0
Prepaid Expenses & Other Assets			1,540
Total Assets			163,203
LIABILITIES AND PARTNERS' CAPITAL
Accounts Payable and Accrued Expenses			3,137
Advance Rental Payments and Security Deposits			1,822
Total Liabilities			4,959
Partners' Capital			158,244
Total Liabilities and Capital			$ 163,203
Partners' Capital % - NERA			50.00%
Investment in Unconsolidated Joint Ventures			$ 79,122
Total units/ condominiums
Total | item	3		120
Units to be sold | item			120
Total number of units sold | item			119
Unsold units | item			1
Units unsold with deposits for future sale | item			1
Hamilton Bay Sales | Residential buildings
Total units/ condominiums
Total | item			120
Hamilton Bay Apts
ASSETS
Rental Properties			$ 5,929,749
Assets held for sales	$ 379,515	$ 2,365,620
Cash & Cash Equivalents	258,487	448,952	923
Rent Receivable		9,199	5,520
Real Estate Tax Escrow			47,308
Prepaid Expenses & Other Assets	113,164	315,996	79,474
Total Assets	751,166	3,139,767	6,062,974
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable			4,430,574
Accounts Payable and Accrued Expenses	9,498	23,049	12,277
Advance Rental Payments and Security Deposits	2,291	19,365	82,693
Total Liabilities	11,789	42,414	4,525,544
Partners' Capital	739,377	3,097,353	1,537,430
Total Liabilities and Capital	$ 751,166	$ 3,139,767	$ 6,062,974
Partners' Capital % - NERA	50.00%	50.00%	50.00%		50.00%
Investment in Unconsolidated Joint Ventures	$ 369,689	$ 1,548,676	$ 768,714		$ 2,500,000
Total units/ condominiums
Total | item	48	48	48		168
Units to be retained | item					(48)
Units to be sold | item	48	48	48
Total number of units sold | item	47	31
Unsold units | item	1	17
Units unsold with deposits for future sale | item		4
Hamilton Bay Apts | Residential buildings
Total units/ condominiums
Total | item	48	48	48
Hamilton Minuteman
ASSETS
Rental Properties	$ 5,639,497	$ 5,870,833	$ 6,165,266
Cash & Cash Equivalents	99,701	88,436	47,795
Rent Receivable	3,711	2,121
Real Estate Tax Escrow	30,801	28,519	18,198
Prepaid Expenses & Other Assets	19,476	25,703	26,473
Total Assets	5,793,186	6,015,612	6,257,732
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable	5,896,001	5,887,818	5,879,634
Accounts Payable and Accrued Expenses	48,866	49,540	50,643
Advance Rental Payments and Security Deposits	124,684	76,426	120,096
Total Liabilities	6,069,551	6,013,784	6,050,373
Partners' Capital	(276,365)	1,828	207,359
Total Liabilities and Capital	$ 5,793,186	$ 6,015,612	$ 6,257,732
Partners' Capital % - NERA	50.00%	50.00%	50.00%				50.00%
Investment in Unconsolidated Joint Ventures		$ 913	$ 103,679				$ 5,075,000
Distribution and Loss in Excess of investments in Unconsolidated Joint Venture	$ (138,183)
Total units/ condominiums
Total | item	42	42	42				42
Units to be retained | item	42	42	42
Hamilton Minuteman | Residential buildings
Total units/ condominiums
Total | item	42	42	42
Hamilton on Main Apts
ASSETS
Rental Properties	$ 16,718,616	$ 17,568,730	$ 17,773,858
Cash & Cash Equivalents	160,310	145,149	95,294
Rent Receivable	23,845	14,879	6,133
Real Estate Tax Escrow	96,761	183,649	189,239
Prepaid Expenses & Other Assets	64,371	71,449	75,324
Total Assets	17,063,903	17,983,856	18,139,848
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable	16,809,043	16,792,991	16,776,940
Accounts Payable and Accrued Expenses	186,461	137,282	157,812
Advance Rental Payments and Security Deposits	389,084	361,677	347,446
Total Liabilities	17,384,588	17,291,950	17,282,198
Partners' Capital	(320,685)	691,906	857,650
Total Liabilities and Capital	$ 17,063,903	$ 17,983,856	$ 18,139,848
Partners' Capital % - NERA	50.00%	50.00%	50.00%					50.00%
Investment in Unconsolidated Joint Ventures		$ 345,952	$ 428,824					$ 8,000,000
Distribution and Loss in Excess of investments in Unconsolidated Joint Venture	$ (160,343)
Total units/ condominiums
Total | item	148	148	148					280
Units to be retained | item	148	148	148
Hamilton on Main Apts | Residential buildings
Total units/ condominiums
Total | item	148	148	148
Dexter Park
ASSETS
Rental Properties	$ 86,988,709	$ 89,746,236	$ 91,943,516
Cash & Cash Equivalents	1,972,138	969,064	1,496,250
Rent Receivable	269,345	152,759	204,956
Real Estate Tax Escrow		316,132	211,494
Prepaid Expenses & Other Assets	1,043,892	1,291,561	1,627,342
Total Assets	90,274,084	92,475,752	95,483,558
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable	124,391,467	81,898,222	83,336,579
Accounts Payable and Accrued Expenses	867,773	750,666	673,585
Advance Rental Payments and Security Deposits	2,559,561	2,469,208	2,667,408
Total Liabilities	127,818,801	85,118,096	86,677,572
Partners' Capital	(37,544,717)	7,357,656	8,805,986
Total Liabilities and Capital	$ 90,274,084	$ 92,475,752	$ 95,483,558
Partners' Capital % - NERA	40.00%	40.00%	40.00%	40.00%
Investment in Unconsolidated Joint Ventures		$ 2,943,060	$ 3,522,393	$ 15,925,000
Distribution and Loss in Excess of investments in Unconsolidated Joint Venture	$ (15,017,887)
Total units/ condominiums
Total | item	409	409	409
Units to be retained | item	409	409	409
Dexter Park | Residential buildings
Total units/ condominiums
Total | item	409	409	409