INVESTMENT IN UNCONSOLIDATED JOINT VENTURES (Balance Sheet) (Details)	Dec. 31, 2022 USD ($) property	Dec. 31, 2021 USD ($) property	Dec. 31, 2020 USD ($) property	Dec. 31, 2019 USD ($)	May 31, 2018 USD ($)	Oct. 28, 2009 item	Mar. 07, 2005 item	Mar. 02, 2005 item	Sep. 30, 2004 item	Aug. 31, 2004 item
ASSETS
Rental Properties	$ 241,076,431	$ 251,355,202
Cash and Cash Equivalents	49,560,723	96,083,508
Rents Receivable	655,814	935,303
Real Estate Tax Escrows	1,943,680	861,697
Prepaid Expenses and Other Assets	8,814,112	6,183,981
Total Assets	391,820,280	356,875,579
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable	410,966,199	370,481,390
Accounts Payable and Accrued Expenses	7,271,729	4,324,879
Advance Rental Payments and Security Deposits	9,032,580	8,369,497
Total Liabilities	451,689,637	406,168,186
Partners' Capital	(59,869,357)	(49,292,607)	$ (41,469,045)	$ (37,823,788)
Total Liabilities and Partners' Capital	391,820,280	356,875,579
Distribution and Loss in Excess of investments in Unconsolidated Joint Venture	(24,419,129)	(22,992,420)
Investment Properties
ASSETS
Rental Properties	107,135,557	111,783,510	115,699,932
Cash and Cash Equivalents	7,055,942	3,391,632	3,582,550
Rents Receivable	403,902	537,327	653,051
Real Estate Tax Escrows	267,947	252,689	233,125
Prepaid Expenses and Other Assets	2,988,297	2,789,752	2,094,682
Total Assets	117,851,645	118,754,910	122,263,340
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable	166,090,968	166,203,707	166,308,029
Accounts Payable and Accrued Expenses	3,047,643	1,033,689	1,045,804
Advance Rental Payments and Security Deposits	4,165,573	3,525,469	3,214,958
Total Liabilities	173,304,184	170,762,865	170,568,791
Partners' Capital	(55,452,539)	(52,007,955)	(48,305,451)
Total Liabilities and Partners' Capital	117,851,645	118,754,910	122,263,340
Investment in Unconsolidated Joint Ventures	1,437,387	1,455,888	1,410,770
Distribution and Loss in Excess of investments in Unconsolidated Joint Venture	(24,419,129)	(22,992,420)	(21,339,743)
Total Investment in Unconsolidated Joint Ventures (Net)	$ (22,981,742)	$ (21,536,532)	$ (19,928,974)
Total units/ condominiums
Total | property	690	690	865
Units to be retained | property	690	690	690
Total number of units sold | property	175	175
Investment Properties | Residential buildings
Total units/ condominiums
Total | property	687	687	862
Investment Properties | Commercial
Total units/ condominiums
Total | property	3	3	3
Hamilton Essex 81
ASSETS
Rental Properties	$ 5,829,640	$ 6,263,331	$ 6,649,177
Cash and Cash Equivalents	985,849	333,699	252,878
Rents Receivable	202,221	232,521	28,181
Real Estate Tax Escrows	74,423	76,651	71,203
Prepaid Expenses and Other Assets	321,912	301,043	281,503
Total Assets	7,414,045	7,207,245	7,282,942
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable	9,962,080	9,948,291	9,934,502
Accounts Payable and Accrued Expenses	165,576	68,265	68,741
Advance Rental Payments and Security Deposits	310,443	180,497	208,851
Total Liabilities	10,438,099	10,197,053	10,212,094
Partners' Capital	(3,024,054)	(2,989,808)	(2,929,152)
Total Liabilities and Partners' Capital	$ 7,414,045	$ 7,207,245	$ 7,282,942
Partners' Capital %-NERA	50.00%	50.00%	50.00%
Distribution and Loss in Excess of investments in Unconsolidated Joint Venture	$ (1,512,027)	$ (1,494,905)	$ (1,464,576)
Total units/ condominiums
Total	49	49	49				48
Units to be retained | property	49	49	49
Hamilton Essex 81 | Residential buildings
Total units/ condominiums
Total | property	48	48	48
Hamilton Essex 81 | Commercial
Total units/ condominiums
Total | property	1	1	1
Hamilton Essex Development
ASSETS
Rental Properties	$ 2,585,680	$ 2,588,169	$ 2,590,659
Cash and Cash Equivalents	110,907	98,674	55,322
Rents Receivable	78,436	68,828
Prepaid Expenses and Other Assets	53,316	62,399	80,008
Total Assets	2,828,339	2,818,070	2,725,989
LIABILITIES AND PARTNERS' CAPITAL
Accounts Payable and Accrued Expenses	43,000	3,000	3,200
Total Liabilities	43,000	3,000	3,200
Partners' Capital	2,785,339	2,815,070	2,722,789
Total Liabilities and Partners' Capital	$ 2,828,339	$ 2,818,070	$ 2,725,989
Partners' Capital %-NERA	50.00%	50.00%	50.00%
Investment in Unconsolidated Joint Ventures	$ 1,392,669	$ 1,407,535	$ 1,361,395
Total units/ condominiums
Total | property	1	1	1
Units to be retained | property	1	1	1
Hamilton Essex Development | Commercial
Total units/ condominiums
Total | property	1	1	1
345 Franklin
ASSETS
Rental Properties	$ 4,810,934	$ 5,062,602	$ 5,373,751
Cash and Cash Equivalents	358,016	155,627	156,073
Rents Receivable		9,905	37,127
Real Estate Tax Escrows	27,771	29,999	19,874
Prepaid Expenses and Other Assets	111,018	117,197	89,636
Total Assets	5,307,739	5,375,330	5,676,461
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable	8,676,945	8,892,331	9,099,301
Accounts Payable and Accrued Expenses	84,025	52,392	87,731
Advance Rental Payments and Security Deposits	269,326	228,803	227,908
Total Liabilities	9,030,296	9,173,526	9,414,940
Partners' Capital	(3,722,557)	(3,798,196)	(3,738,479)
Total Liabilities and Partners' Capital	$ 5,307,739	$ 5,375,330	$ 5,676,461
Partners' Capital %-NERA	50.00%	50.00%	50.00%
Distribution and Loss in Excess of investments in Unconsolidated Joint Venture	$ (1,861,278)	$ (1,899,098)	$ (1,869,240)
Total units/ condominiums
Total | property	40	40	40
Units to be retained | property	40	40	40
345 Franklin | Residential buildings
Total units/ condominiums
Total | property	40	40	40
Hamilton 1025
ASSETS
Rental Properties	$ 78,291	$ 81,555	$ 84,819
Cash and Cash Equivalents	29,065	11,845	13,443
Rents Receivable	4,915	6,111	3,005
Prepaid Expenses and Other Assets	493	446	407
Total Assets	112,764	99,957	101,674
LIABILITIES AND PARTNERS' CAPITAL
Accounts Payable and Accrued Expenses	23,329	3,251	2,924
Total Liabilities	23,329	3,251	2,924
Partners' Capital	89,435	96,706	98,750
Total Liabilities and Partners' Capital	$ 112,764	$ 99,957	$ 101,674
Partners' Capital %-NERA	50.00%	50.00%	50.00%
Investment in Unconsolidated Joint Ventures	$ 44,718	$ 48,353	$ 49,375
Total units/ condominiums
Total	1	176	176					176
Units to be retained	1	1	1					(49)
Total number of units sold | property	175	175
Hamilton 1025 | Residential buildings
Total units/ condominiums
Total | property		0	175
Hamilton 1025 | Commercial
Total units/ condominiums
Total | property	1	1	1
Hamilton Minuteman
ASSETS
Rental Properties	$ 4,467,772	$ 4,697,616	$ 4,998,436
Cash and Cash Equivalents	328,742	156,058	159,599
Rents Receivable	2,600	6,999	3,816
Real Estate Tax Escrows	34,842	36,451	35,849
Prepaid Expenses and Other Assets	26,238	24,009	23,198
Total Assets	4,860,194	4,921,133	5,220,898
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable	5,928,736	5,920,552	5,912,368
Accounts Payable and Accrued Expenses	162,623	48,145	50,514
Advance Rental Payments and Security Deposits	171,680	159,324	137,792
Total Liabilities	6,263,039	6,128,021	6,100,674
Partners' Capital	(1,402,845)	(1,206,888)	(879,776)
Total Liabilities and Partners' Capital	$ 4,860,194	$ 4,921,133	$ 5,220,898
Partners' Capital %-NERA	50.00%	50.00%	50.00%
Distribution and Loss in Excess of investments in Unconsolidated Joint Venture	$ (701,422)	$ (603,445)	$ (439,888)
Total units/ condominiums
Total	42	42	42						42
Units to be retained | property	42	42	42
Hamilton Minuteman | Residential buildings
Total units/ condominiums
Total | property	42	42	42
Hamilton on Main Apts
ASSETS
Rental Properties	$ 13,456,133	$ 14,334,539	$ 15,239,672
Cash and Cash Equivalents	1,377,250	565,171	520,150
Rents Receivable	9,565	37,750	65,511
Real Estate Tax Escrows	130,911	109,588	106,199
Prepaid Expenses and Other Assets	186,990	181,941	148,796
Total Assets	15,160,849	15,228,989	16,080,328
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable	16,873,248	16,857,197	16,841,145
Accounts Payable and Accrued Expenses	556,239	188,012	156,923
Advance Rental Payments and Security Deposits	463,963	434,126	424,314
Total Liabilities	17,893,450	17,479,335	17,422,382
Partners' Capital	(2,732,601)	(2,250,346)	(1,342,054)
Total Liabilities and Partners' Capital	$ 15,160,849	$ 15,228,989	$ 16,080,328
Partners' Capital %-NERA	50.00%	50.00%	50.00%
Distribution and Loss in Excess of investments in Unconsolidated Joint Venture	$ (1,366,300)	$ (1,125,174)	$ (671,027)
Total units/ condominiums
Total	148	148	148							280
Units to be retained | property	148	148	148
Hamilton on Main Apts | Residential buildings
Total units/ condominiums
Total | property	148	148	148
Dexter Park
ASSETS
Rental Properties	$ 75,907,107	$ 78,755,698	$ 80,763,418
Cash and Cash Equivalents	3,866,113	2,070,558	2,425,085
Rents Receivable	106,165	175,213	515,411
Prepaid Expenses and Other Assets	2,288,330	2,102,717	1,471,134
Total Assets	82,167,715	83,104,186	85,175,048
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable	124,649,959	124,585,336	124,520,713		$ 82,000,000
Accounts Payable and Accrued Expenses	2,012,851	670,624	675,771
Advance Rental Payments and Security Deposits	2,950,161	2,522,719	2,216,093
Total Liabilities	129,612,971	127,778,679	127,412,577
Partners' Capital	(47,445,256)	(44,674,493)	(42,237,529)
Total Liabilities and Partners' Capital	$ 82,167,715	$ 83,104,186	$ 85,175,048
Partners' Capital %-NERA	40.00%	40.00%	40.00%
Distribution and Loss in Excess of investments in Unconsolidated Joint Venture	$ (18,978,102)	$ (17,869,798)	$ (16,895,012)
Total units/ condominiums
Total	409	409	409			409
Units to be retained | property	409	409	409
Dexter Park | Residential buildings
Total units/ condominiums
Total | property	409	409	409