INVESTMENT IN UNCONSOLIDATED JOINT VENTURES (Balance Sheet) (Details)	Dec. 31, 2021 USD ($) item	Dec. 31, 2020 USD ($) item	Dec. 31, 2019 USD ($) item	Dec. 31, 2018 USD ($)	May 31, 2018 USD ($)	Oct. 28, 2009 USD ($) item	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	$ 251,355,202	$ 264,609,887
Cash and Cash Equivalents	96,083,508	18,646,972
Rents Receivable	935,303	1,412,074
Real Estate Tax Escrows	861,697	534,941
Prepaid Expenses and Other Assets	6,183,981	5,054,959
Total Assets	356,875,579	291,669,602
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable	370,481,390	283,444,533
Accounts Payable and Accrued Expenses	4,324,879	3,888,237
Advance Rental Payments and Security Deposits	8,369,497	7,466,134
Total Liabilities	406,168,186	333,138,647
Partners' Capital	(49,292,607)	(41,469,045)	$ (37,823,788)	$ (35,624,010)
Total Liabilities and Partners' Capital	356,875,579	291,669,602
Investment in Unconsolidated Joint Ventures	1,455,888	1,410,769
Distribution and Loss in Excess of investments in Unconsolidated Joint Venture	$ (22,992,420)	$ (21,339,743)
NERA 50%
LIABILITIES AND PARTNERS' CAPITAL
Partners' Capital % - NERA	50.00%	50.00%	50.00%
NERA 40%
LIABILITIES AND PARTNERS' CAPITAL
Partners' Capital % - NERA	40.00%	40.00%	40.00%
Investment Properties
ASSETS
Rental Properties	$ 111,783,510	$ 115,699,932	$ 120,639,006
Cash and Cash Equivalents	3,391,632	3,582,550	3,241,512
Rents Receivable	537,327	653,051	305,729
Real Estate Tax Escrows	252,689	233,125	201,102
Prepaid Expenses and Other Assets	2,789,752	2,094,682	2,242,597
Total Assets	118,754,910	122,263,340	126,629,946
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable	166,203,707	166,308,029	166,404,256
Accounts Payable and Accrued Expenses	1,033,689	1,045,804	1,300,598
Advance Rental Payments and Security Deposits	3,525,469	3,214,958	4,054,640
Total Liabilities	170,762,865	170,568,791	171,759,494
Partners' Capital	(52,007,955)	(48,305,451)	(45,129,548)
Total Liabilities and Partners' Capital	118,754,910	122,263,340	126,629,946
Investment in Unconsolidated Joint Ventures	1,455,888	1,410,769	1,430,402
Distribution and Loss in Excess of investments in Unconsolidated Joint Venture	(22,992,420)	(21,339,743)	(19,970,089)
Total Investment in Unconsolidated Joint Ventures (Net)	$ (21,536,532)	$ (19,928,974)	$ (18,539,687)
Total units/ condominiums
Total | item	690	865	913
Units to be retained | item	690	690	690
Total number of units sold | item			175
Investment Properties | Residential buildings
Total units/ condominiums
Total | item	687	862	910
Investment Properties | Commercial
Total units/ condominiums
Total | item	3	3	3
Hamilton Essex 81
ASSETS
Rental Properties	$ 6,263,331	$ 6,649,177	$ 7,083,307
Cash and Cash Equivalents	333,699	252,878	197,467
Rents Receivable	232,521	28,181	217,779
Real Estate Tax Escrows	76,651	71,203	66,410
Prepaid Expenses and Other Assets	301,043	281,503	303,876
Total Assets	7,207,245	7,282,942	7,868,839
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable	9,948,291	9,934,502	9,920,713
Accounts Payable and Accrued Expenses	68,265	68,741	81,718
Advance Rental Payments and Security Deposits	180,497	208,851	321,205
Total Liabilities	10,197,053	10,212,094	10,323,636
Partners' Capital	(2,989,808)	(2,929,152)	(2,454,797)
Total Liabilities and Partners' Capital	$ 7,207,245	$ 7,282,942	$ 7,868,839
Partners' Capital % - NERA	50.00%	50.00%	50.00%
Distribution and Loss in Excess of investments in Unconsolidated Joint Venture	$ (1,494,905)	$ (1,464,576)	$ (1,227,399)
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	$ 2,588,169	$ 2,590,659	$ 2,593,148
Cash and Cash Equivalents	98,674	55,322	49,460
Rents Receivable	68,828		33,072
Prepaid Expenses and Other Assets	62,399	80,008	97,716
Total Assets	2,818,070	2,725,989	2,773,396
LIABILITIES AND PARTNERS' CAPITAL
Accounts Payable and Accrued Expenses	3,000	3,200	2,600
Total Liabilities	3,000	3,200	2,600
Partners' Capital	2,815,070	2,722,789	2,770,796
Total Liabilities and Partners' Capital	$ 2,818,070	$ 2,725,989	$ 2,773,396
Partners' Capital % - NERA	50.00%	50.00%	50.00%
Investment in Unconsolidated Joint Ventures	$ 1,407,535	$ 1,361,395	$ 1,385,398
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	$ 5,062,602	$ 5,373,751	$ 5,678,703
Cash and Cash Equivalents	155,627	156,073	223,691
Rents Receivable	9,905	37,127
Real Estate Tax Escrows	29,999	19,874	19,985
Prepaid Expenses and Other Assets	117,197	89,636	84,228
Total Assets	5,375,330	5,676,461	6,006,607
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable	8,892,331	9,099,301	9,298,174
Accounts Payable and Accrued Expenses	52,392	87,731	77,908
Advance Rental Payments and Security Deposits	228,803	227,908	325,682
Total Liabilities	9,173,526	9,414,940	9,701,764
Partners' Capital	(3,798,196)	(3,738,479)	(3,695,157)
Total Liabilities and Partners' Capital	$ 5,375,330	$ 5,676,461	$ 6,006,607
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	$ (1,899,098)	$ (1,869,240)	$ (1,847,579)
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	$ 81,555	$ 84,819	$ 88,083
Cash and Cash Equivalents	11,845	13,443	8,186
Rents Receivable	6,111	3,005
Prepaid Expenses and Other Assets	446	407	1,567
Total Assets	99,957	101,674	97,836
LIABILITIES AND PARTNERS' CAPITAL
Accounts Payable and Accrued Expenses	3,251	2,924	7,828
Total Liabilities	3,251	2,924	7,828
Partners' Capital	96,706	98,750	90,008
Total Liabilities and Partners' Capital	$ 99,957	$ 101,674	$ 97,836
Partners' Capital % - NERA	50.00%	50.00%	50.00%					50.00%
Investment in Unconsolidated Joint Ventures	$ 48,353	$ 49,375	$ 45,004					$ 2,352,000
Total units/ condominiums
Total | item	176	176	176					176
Units to be retained | item	1	1	1					(49)
Total number of units sold | item		0	175
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 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)
Hamilton Minuteman
ASSETS
Rental Properties	$ 4,697,616	$ 4,998,436	$ 5,323,570
Cash and Cash Equivalents	156,058	159,599	95,965
Rents Receivable	6,999	3,816	221
Real Estate Tax Escrows	36,451	35,849	29,110
Prepaid Expenses and Other Assets	24,009	23,198	23,831
Total Assets	4,921,133	5,220,898	5,472,697
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable	5,920,552	5,912,368	5,904,185
Accounts Payable and Accrued Expenses	48,145	50,514	47,740
Advance Rental Payments and Security Deposits	159,324	137,792	151,180
Total Liabilities	6,128,021	6,100,674	6,103,105
Partners' Capital	(1,206,888)	(879,776)	(630,408)
Total Liabilities and Partners' Capital	$ 4,921,133	$ 5,220,898	$ 5,472,697
Partners' Capital % - NERA	50.00%	50.00%	50.00%						50.00%
Investment in Unconsolidated Joint Ventures									$ 5,075,000
Distribution and Loss in Excess of investments in Unconsolidated Joint Venture	$ (603,445)	$ (439,888)	$ (315,204)
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	$ 14,334,539	$ 15,239,672	$ 15,891,917
Cash and Cash Equivalents	565,171	520,150	480,899
Rents Receivable	37,750	65,511	11,284
Real Estate Tax Escrows	109,588	106,199	85,597
Prepaid Expenses and Other Assets	181,941	148,796	158,714
Total Assets	15,228,989	16,080,328	16,628,411
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable	16,857,197	16,841,145	16,825,094
Accounts Payable and Accrued Expenses	188,012	156,923	282,855
Advance Rental Payments and Security Deposits	434,126	424,314	479,585
Total Liabilities	17,479,335	17,422,382	17,587,534
Partners' Capital	(2,250,346)	(1,342,054)	(959,123)
Total Liabilities and Partners' Capital	$ 15,228,989	$ 16,080,328	$ 16,628,411
Partners' Capital % - NERA	50.00%	50.00%	50.00%							50.00%
Investment in Unconsolidated Joint Ventures										$ 8,000,000
Distribution and Loss in Excess of investments in Unconsolidated Joint Venture	$ (1,125,174)	$ (671,027)	$ (479,562)
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	$ 78,755,698	$ 80,763,418	$ 83,980,278
Cash and Cash Equivalents	2,070,558	2,425,085	2,185,844
Rents Receivable	175,213	515,411	43,373
Prepaid Expenses and Other Assets	2,102,717	1,471,134	1,572,665
Total Assets	83,104,186	85,175,048	87,782,160
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable	124,585,336	124,520,713	124,456,090		$ 82,000,000
Accounts Payable and Accrued Expenses	670,624	675,771	799,949
Advance Rental Payments and Security Deposits	2,522,719	2,216,093	2,776,988
Total Liabilities	127,778,679	127,412,577	128,033,027
Partners' Capital	(44,674,493)	(42,237,529)	(40,250,867)
Total Liabilities and Partners' Capital	$ 83,104,186	$ 85,175,048	$ 87,782,160
Partners' Capital % - NERA	40.00%	40.00%	40.00%			40.00%
Investment in Unconsolidated Joint Ventures						$ 15,925,000
Distribution and Loss in Excess of investments in Unconsolidated Joint Venture	$ (17,869,798)	$ (16,895,012)	$ (16,100,347)
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			409