INVESTMENT IN UNCONSOLIDATED JOINT VENTURES (Balance Sheet) (Details)	Dec. 31, 2023 USD ($) property	Dec. 31, 2022 USD ($) property	Dec. 31, 2021 USD ($) property	Dec. 31, 2020 USD ($)	May 31, 2018 USD ($)	Oct. 28, 2009 item	Mar. 07, 2005 item	Mar. 02, 2005 item	Sep. 30, 2004 item
ASSETS
Rental Properties	$ 269,804,946	$ 241,076,431
Cash & Cash Equivalents	18,230,463	49,560,723
Rent Receivable	953,761	655,814
Real Estate Tax Escrows	2,229,703	1,943,680
Prepaid Expenses & Other Assets	8,369,775	8,240,629
Total Assets	385,730,690	391,820,280
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable	408,660,292	410,966,199
Accounts Payable & Accrued Expense	5,720,088	7,271,729
Advance Rental Pmts & Security Deposits	9,996,887	9,032,580
Total Liabilities	451,085,074	451,689,637
Partners' Capital	(65,354,384)	(59,869,357)	$ (49,292,608)	$ (41,469,045)
Total Liabilities and Partners' Capital	385,730,690	391,820,280
Distribution and Loss in Excess of investments in Unconsolidated Joint Ventures	(26,707,807)	(24,419,129)
Investment Properties
ASSETS
Rental Properties	102,406,871	107,135,557	111,783,510
Cash & Cash Equivalents	4,678,735	7,055,942	3,391,632
Rent Receivable	433,138	403,902	537,327
Real Estate Tax Escrows	276,474	267,947	252,689
Prepaid Expenses & Other Assets	3,211,400	2,988,297	2,789,752
Total Assets	111,006,618	117,851,645	118,754,910
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable	165,969,481	166,090,968	166,203,707
Accounts Payable & Accrued Expense	1,359,083	3,047,643	1,033,689
Advance Rental Pmts & Security Deposits	4,370,346	4,165,573	3,525,469
Total Liabilities	171,698,910	173,304,184	170,762,865
Partners' Capital	(60,692,292)	(55,452,539)	(52,007,955)
Total Liabilities and Partners' Capital	111,006,618	117,851,645	118,754,910
Investment in Unconsolidated Joint Ventures	1,441,291	1,437,387	1,455,888
Distribution and Loss in Excess of investments in Unconsolidated Joint Ventures	(26,707,807)	(24,419,129)	(22,992,420)
Total Investment in Unconsolidated Joint Ventures (Net)	$ (25,266,517)	$ (22,981,742)	$ (21,536,532)
Total units/ condominiums
Total | property	690	865	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	862	862
Investment Properties | Commercial
Total units/ condominiums
Total | property	3	3	3
Hamilton Essex 81
ASSETS
Rental Properties	$ 5,403,706	$ 5,829,640	$ 6,263,331
Cash & Cash Equivalents	1,141,751	985,849	333,699
Rent Receivable	208,968	202,221	232,521
Real Estate Tax Escrows	75,475	74,423	76,651
Prepaid Expenses & Other Assets	320,627	321,912	301,043
Total Assets	7,150,527	7,414,045	7,207,245
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable	9,975,869	9,962,080	9,948,291
Accounts Payable & Accrued Expense	141,743	165,576	68,265
Advance Rental Pmts & Security Deposits	337,593	310,443	180,497
Total Liabilities	10,455,205	10,438,099	10,197,053
Partners' Capital	(3,304,678)	(3,024,054)	(2,989,808)
Total Liabilities and Partners' Capital	$ 7,150,527	$ 7,414,045	$ 7,207,245
Partners' Capital %-NERA	50.00%	50.00%	50.00%
Distribution and Loss in Excess of investments in Unconsolidated Joint Ventures	$ (1,652,340)	$ (1,512,027)	$ (1,494,905)
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	$ 2,583,190	$ 2,585,680	$ 2,588,169
Cash & Cash Equivalents	108,348	110,907	98,674
Rent Receivable	78,753	78,436	68,828
Prepaid Expenses & Other Assets	44,182	53,316	62,399
Total Assets	2,814,473	2,828,339	2,818,070
LIABILITIES AND PARTNERS' CAPITAL
Accounts Payable & Accrued Expense	3,000	43,000	3,000
Advance Rental Pmts & Security Deposits	20,660
Total Liabilities	23,660	43,000	3,000
Partners' Capital	2,790,813	2,785,339	2,815,070
Total Liabilities and Partners' Capital	$ 2,814,473	$ 2,828,339	$ 2,818,070
Partners' Capital %-NERA	50.00%	50.00%	50.00%
Investment in Unconsolidated Joint Ventures	$ 1,395,406	$ 1,392,669	$ 1,407,535
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	$ 4,481,606	$ 4,810,934	$ 5,062,602
Cash & Cash Equivalents	155,557	358,016	155,627
Rent Receivable	117		9,905
Real Estate Tax Escrows	29,290	27,771	29,999
Prepaid Expenses & Other Assets	73,604	111,018	117,197
Total Assets	4,740,174	5,307,739	5,375,330
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable	8,452,812	8,676,945	8,892,331
Accounts Payable & Accrued Expense	64,335	84,025	52,392
Advance Rental Pmts & Security Deposits	304,499	269,326	228,803
Total Liabilities	8,821,646	9,030,296	9,173,526
Partners' Capital	(4,081,472)	(3,722,557)	(3,798,196)
Total Liabilities and Partners' Capital	$ 4,740,174	$ 5,307,739	$ 5,375,330
Partners' Capital %-NERA	50.00%	50.00%	50.00%
Distribution and Loss in Excess of investments in Unconsolidated Joint Ventures	$ (2,040,737)	$ (1,861,278)	$ (1,899,098)
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	$ 75,027	$ 78,291	$ 81,555
Cash & Cash Equivalents	16,339	29,065	11,845
Rent Receivable	4,120	4,915	6,111
Prepaid Expenses & Other Assets	505	493	446
Total Assets	95,991	112,764	99,957
LIABILITIES AND PARTNERS' CAPITAL
Accounts Payable & Accrued Expense	3,486	23,329	3,251
Advance Rental Pmts & Security Deposits	735
Total Liabilities	4,221	23,329	3,251
Partners' Capital	91,770	89,435	96,706
Total Liabilities and Partners' Capital	$ 95,991	$ 112,764	$ 99,957
Partners' Capital %-NERA	50.00%	50.00%	50.00%
Investment in Unconsolidated Joint Ventures	$ 45,885	$ 44,718	$ 48,353
Total units/ condominiums
Total	176	176	176					176
Units to be retained	1	1	1					(49)
Total number of units sold | property	175	175
Unsold units | property			175
Hamilton 1025 | Residential buildings
Total units/ condominiums
Total | property	175	175	175
Hamilton 1025 | Commercial
Total units/ condominiums
Total | property	1	1	1
Hamilton Minuteman
ASSETS
Rental Properties	$ 4,190,275	$ 4,467,772	$ 4,697,616
Cash & Cash Equivalents	148,334	328,742	156,058
Rent Receivable	2,957	2,600	6,999
Real Estate Tax Escrows	34,998	34,842	36,451
Prepaid Expenses & Other Assets	50,327	26,238	24,009
Total Assets	4,426,891	4,860,194	4,921,133
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable	5,936,919	5,928,736	5,920,552
Accounts Payable & Accrued Expense	50,990	162,623	48,145
Advance Rental Pmts & Security Deposits	173,222	171,680	159,324
Total Liabilities	6,161,131	6,263,039	6,128,021
Partners' Capital	(1,734,240)	(1,402,845)	(1,206,888)
Total Liabilities and Partners' Capital	$ 4,426,891	$ 4,860,194	$ 4,921,133
Partners' Capital %-NERA	50.00%	50.00%	50.00%
Distribution and Loss in Excess of investments in Unconsolidated Joint Ventures	$ (867,121)	$ (701,422)	$ (603,445)
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	$ 12,493,492	$ 13,456,133	$ 14,334,539
Cash & Cash Equivalents	1,204,116	1,377,250	565,171
Rent Receivable	22,319	9,565	37,750
Real Estate Tax Escrows	136,711	130,911	109,588
Prepaid Expenses & Other Assets	227,421	186,990	181,941
Total Assets	14,084,059	15,160,849	15,228,989
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable	16,889,299	16,873,248	16,857,197
Accounts Payable & Accrued Expense	352,780	556,239	188,012
Advance Rental Pmts & Security Deposits	500,103	463,963	434,126
Total Liabilities	17,742,182	17,893,450	17,479,335
Partners' Capital	(3,658,123)	(2,732,601)	(2,250,346)
Total Liabilities and Partners' Capital	$ 14,084,059	$ 15,160,849	$ 15,228,989
Partners' Capital %-NERA	50.00%	50.00%	50.00%
Distribution and Loss in Excess of investments in Unconsolidated Joint Ventures	$ (1,829,063)	$ (1,366,300)	$ (1,125,174)
Total units/ condominiums
Total | property	148	148	148
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	$ 73,179,575	$ 75,907,107	$ 78,755,698
Cash & Cash Equivalents	1,904,290	3,866,113	2,070,558
Rent Receivable	115,904	106,165	175,213
Prepaid Expenses & Other Assets	2,494,734	2,288,330	2,102,717
Total Assets	77,694,503	82,167,715	83,104,186
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable	124,714,582	124,649,959	124,585,336		$ 82,000,000
Accounts Payable & Accrued Expense	742,749	2,012,851	670,624
Advance Rental Pmts & Security Deposits	3,033,534	2,950,161	2,522,719
Total Liabilities	128,490,865	129,612,971	127,778,679
Partners' Capital	(50,796,362)	(47,445,256)	(44,674,493)
Total Liabilities and Partners' Capital	$ 77,694,503	$ 82,167,715	$ 83,104,186
Partners' Capital %-NERA	40.00%	40.00%	40.00%
Distribution and Loss in Excess of investments in Unconsolidated Joint Ventures	$ (20,318,546)	$ (18,978,102)	$ (17,869,797)
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