INVESTMENT IN UNCONSOLIDATED JOINT VENTURES (Balance Sheet) (Details)	Dec. 31, 2024 USD ($) property	Dec. 31, 2023 USD ($) property	Dec. 31, 2022 USD ($) property	Dec. 31, 2021 USD ($)	May 31, 2018 USD ($)	Oct. 28, 2009 item	Mar. 07, 2005 item	Mar. 02, 2005 item	Sep. 30, 2004 item
ASSETS
Rental Properties	$ 278,516,649	$ 269,804,946
Cash & Cash Equivalents	17,615,940	18,230,463
Rent Receivable	1,220,761	953,761
Real Estate Tax Escrow	2,598,073	2,229,703
Prepaid Expenses & Other Assets	8,553,360	8,369,775
Total Assets	393,508,658	385,730,690
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable	406,205,910	408,660,292
Accounts Payable & Accrued Expense	9,004,962	5,720,088
Advance Rental Pmts & Security Deposits	10,199,807	9,996,887
Total Liabilities	455,942,560	451,085,074
Partners' Capital	(62,433,902)	(65,354,384)	$ (59,869,357)	$ (49,292,608)
Total Liabilities and Partners' Capital	393,508,658	385,730,690
Distribution and Loss in Excess of investments in Unconsolidated Joint Ventures	(30,531,881)	(26,707,807)
Investment Properties
ASSETS
Rental Properties	99,952,914	102,406,871	107,135,557
Cash & Cash Equivalents	5,745,266	4,678,735	7,055,942
Rent Receivable	426,558	433,138	403,902
Real Estate Tax Escrow	139,958	276,474	267,947
Prepaid Expenses & Other Assets	3,339,393	3,211,400	2,988,297
Total Assets	109,604,089	111,006,618	117,851,645
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable	172,287,696	165,969,481	166,090,968
Accounts Payable & Accrued Expense	1,446,667	1,359,083	3,047,643
Advance Rental Pmts & Security Deposits	4,541,297	4,370,346	4,165,573
Total Liabilities	178,275,660	171,698,910	173,304,184
Partners' Capital	(68,671,571)	(60,692,292)	(55,452,539)
Total Liabilities and Partners' Capital	109,604,089	111,006,618	117,851,645
Investment in Unconsolidated Joint Ventures	1,417,470	1,441,291	1,437,387
Distribution and Loss in Excess of investments in Unconsolidated Joint Ventures	(30,531,881)	(26,707,807)	(24,419,129)
Total Investment in Unconsolidated Joint Ventures (Net)	$ (29,114,411)	$ (25,266,517)	$ (22,981,742)
Total units/ condominiums
Total | property	690	690	690
Investment Properties | Apartments
Total units/ condominiums
Total | property	687	687	687
Investment Properties | Commercial
Total units/ condominiums
Total | property	3	3	3
Hamilton Essex 81
ASSETS
Rental Properties	$ 5,004,114	$ 5,403,706	$ 5,829,640
Cash & Cash Equivalents	1,443,698	1,141,751	985,849
Rent Receivable	202,234	208,968	202,221
Real Estate Tax Escrow	74,949	75,475	74,423
Prepaid Expenses & Other Assets	312,911	320,627	321,912
Total Assets	7,037,906	7,150,527	7,414,045
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable	9,989,658	9,975,869	9,962,080
Accounts Payable & Accrued Expense	297,308	141,743	165,576
Advance Rental Pmts & Security Deposits	372,656	337,593	310,443
Total Liabilities	10,659,622	10,455,205	10,438,099
Partners' Capital	(3,621,716)	(3,304,678)	(3,024,054)
Total Liabilities and Partners' Capital	$ 7,037,906	$ 7,150,527	$ 7,414,045
Partners' Capital %-NERA	50.00%	50.00%	50.00%
Distribution and Loss in Excess of investments in Unconsolidated Joint Ventures	$ (1,810,859)	$ (1,652,340)	$ (1,512,027)
Total units/ condominiums
Total	49	49	49				48
Hamilton Essex 81 | Apartments
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	$ 2,580,701	$ 2,583,190	$ 2,585,680
Cash & Cash Equivalents	63,207	108,348	110,907
Rent Receivable	71,060	78,753	78,436
Prepaid Expenses & Other Assets	35,021	44,182	53,316
Total Assets	2,749,989	2,814,473	2,828,339
LIABILITIES AND PARTNERS' CAPITAL
Accounts Payable & Accrued Expense	4,000	3,000	43,000
Advance Rental Pmts & Security Deposits		20,660
Total Liabilities	4,000	23,660	43,000
Partners' Capital	2,745,989	2,790,813	2,785,339
Total Liabilities and Partners' Capital	$ 2,749,989	$ 2,814,473	$ 2,828,339
Partners' Capital %-NERA	50.00%	50.00%	50.00%
Investment in Unconsolidated Joint Ventures	$ 1,372,994	$ 1,395,406	$ 1,392,670
Total units/ condominiums
Total | property	1	1	1
Hamilton Essex Development | Commercial
Total units/ condominiums
Total | property	1	1	1
345 Franklin
ASSETS
Rental Properties	$ 4,157,090	$ 4,481,606	$ 4,810,934
Cash & Cash Equivalents	165,608	155,557	358,016
Rent Receivable	2,679	117
Real Estate Tax Escrow	37,432	29,290	27,771
Prepaid Expenses & Other Assets	78,348	73,604	111,018
Total Assets	4,441,157	4,740,174	5,307,739
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable	8,219,587	8,452,812	8,676,945
Accounts Payable & Accrued Expense	82,623	64,335	84,025
Advance Rental Pmts & Security Deposits	262,266	304,499	269,326
Total Liabilities	8,564,476	8,821,646	9,030,296
Partners' Capital	(4,123,319)	(4,081,472)	(3,722,557)
Total Liabilities and Partners' Capital	$ 4,441,157	$ 4,740,174	$ 5,307,739
Partners' Capital %-NERA	50.00%	50.00%	50.00%
Distribution and Loss in Excess of investments in Unconsolidated Joint Ventures	$ (2,061,661)	$ (2,040,737)	$ (1,861,278)
Total units/ condominiums
Total | property	40	40	40
345 Franklin | Apartments
Total units/ condominiums
Total | property	40	40	40
Hamilton 1025
ASSETS
Rental Properties	$ 71,763	$ 75,027	$ 78,291
Cash & Cash Equivalents	18,352	16,339	29,065
Rent Receivable	1,655	4,120	4,915
Prepaid Expenses & Other Assets	515	505	493
Total Assets	92,285	95,991	112,764
LIABILITIES AND PARTNERS' CAPITAL
Accounts Payable & Accrued Expense	3,332	3,486	23,329
Advance Rental Pmts & Security Deposits		735
Total Liabilities	3,332	4,221	23,329
Partners' Capital	88,953	91,770	89,435
Total Liabilities and Partners' Capital	$ 92,285	$ 95,991	$ 112,764
Partners' Capital %-NERA	50.00%	50.00%	50.00%
Investment in Unconsolidated Joint Ventures	$ 44,477	$ 45,885	$ 44,718
Total units/ condominiums
Total	1	1	1					176
Units to be retained | item								49
Hamilton 1025 | Commercial
Total units/ condominiums
Total | property	1	1	1
Hamilton Minuteman Apts
ASSETS
Rental Properties	$ 3,922,243	$ 4,190,275	$ 4,467,772
Cash & Cash Equivalents	204,938	148,334	328,742
Rent Receivable	2,278	2,957	2,600
Real Estate Tax Escrow	27,577	34,998	34,842
Prepaid Expenses & Other Assets	60,979	50,327	26,238
Total Assets	4,218,015	4,426,891	4,860,194
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable	5,945,102	5,936,919	5,928,736
Accounts Payable & Accrued Expense	53,813	50,990	162,623
Advance Rental Pmts & Security Deposits	167,307	173,222	171,680
Total Liabilities	6,166,222	6,161,131	6,263,039
Partners' Capital	(1,948,207)	(1,734,240)	(1,402,845)
Total Liabilities and Partners' Capital	$ 4,218,015	$ 4,426,891	$ 4,860,194
Partners' Capital %-NERA	50.00%	50.00%	50.00%
Distribution and Loss in Excess of investments in Unconsolidated Joint Ventures	$ (974,105)	$ (867,121)	$ (701,422)
Total units/ condominiums
Total	42	42	42						42
Hamilton Minuteman Apts | Apartments
Total units/ condominiums
Total | property	42	42	42
Hamilton on Main Apts
ASSETS
Rental Properties	$ 13,644,999	$ 12,493,492	$ 13,456,133
Cash & Cash Equivalents	632,190	1,204,116	1,377,250
Rent Receivable	50,479	22,319	9,565
Real Estate Tax Escrow		136,711	130,911
Prepaid Expenses & Other Assets	241,814	227,421	186,990
Total Assets	14,569,482	14,084,059	15,160,849
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable	23,354,144	16,889,299	16,873,248
Accounts Payable & Accrued Expense	305,519	352,780	556,239
Advance Rental Pmts & Security Deposits	509,294	500,103	463,963
Total Liabilities	24,168,957	17,742,182	17,893,450
Partners' Capital	(9,599,475)	(3,658,123)	(2,732,601)
Total Liabilities and Partners' Capital	$ 14,569,482	$ 14,084,059	$ 15,160,849
Partners' Capital %-NERA	50.00%	50.00%	50.00%
Distribution and Loss in Excess of investments in Unconsolidated Joint Ventures	$ (4,799,739)	$ (1,829,063)	$ (1,366,300)
Total units/ condominiums
Total | property	148	148	148
Hamilton on Main Apts | Apartments
Total units/ condominiums
Total | property	148	148	148
Dexter Park
ASSETS
Rental Properties	$ 70,572,004	$ 73,179,575	$ 75,907,107
Cash & Cash Equivalents	3,217,273	1,904,290	3,866,113
Rent Receivable	96,173	115,904	106,165
Prepaid Expenses & Other Assets	2,609,805	2,494,734	2,288,330
Total Assets	76,495,255	77,694,503	82,167,715
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable	124,779,205	124,714,582	124,649,959		$ 82,000,000
Accounts Payable & Accrued Expense	700,072	742,749	2,012,851
Advance Rental Pmts & Security Deposits	3,229,774	3,033,534	2,950,161
Total Liabilities	128,709,051	128,490,865	129,612,971
Partners' Capital	(52,213,796)	(50,796,362)	(47,445,256)
Total Liabilities and Partners' Capital	$ 76,495,255	$ 77,694,503	$ 82,167,715
Partners' Capital %-NERA	40.00%	40.00%	40.00%
Distribution and Loss in Excess of investments in Unconsolidated Joint Ventures	$ (20,885,518)	$ (20,318,546)	$ (18,978,102)
Total units/ condominiums
Total	409	409	409			409
Dexter Park | Apartments
Total units/ condominiums
Total | property	409	409	409