INVESTMENT IN UNCONSOLIDATED JOINT VENTURES (Balance Sheet) (Details)	Jun. 30, 2023 USD ($) property	Dec. 31, 2022 USD ($)	Jun. 30, 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	Aug. 31, 2004 item	Nov. 30, 2001 item
ASSETS
Rental Properties	$ 247,450,840	$ 241,076,431
Cash & Cash Equivalents	55,700,166	49,560,723
Rent Receivable	769,712	655,814
Real Estate Tax Escrows	2,149,919	1,943,680
Prepaid Expenses & Other Assets	11,075,437	8,814,112
Total Assets	386,936,754	391,820,280
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable	409,834,512	410,966,199
Accounts Payable & Accrued Expense	5,567,224	7,271,729
Advance Rental Pmts & Security Deposits	9,878,020	9,032,580
Total Liabilities	451,242,787	451,689,637
Partners' Capital	(64,306,033)	(59,869,357)	$ (59,372,762)	$ (49,292,607)
Total Liabilities and Partners' Capital	386,936,754	391,820,280
Distribution and Loss in Excess of investments in Unconsolidated Joint Ventures	(25,963,031)	$ (24,419,129)
Investment Properties
ASSETS
Rental Properties	104,760,781		109,473,753
Cash & Cash Equivalents	4,400,626		4,005,493
Rent Receivable	448,456		475,307
Real Estate Tax Escrows	274,066		207,892
Prepaid Expenses & Other Assets	3,409,066		3,491,947
Total Assets	113,292,995		117,654,392
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable	166,031,339		166,148,408
Accounts Payable & Accrued Expense	1,381,218		1,098,219
Advance Rental Pmts & Security Deposits	4,859,356		5,063,187
Total Liabilities	172,271,913		172,309,814
Partners' Capital	(58,978,918)		(54,655,422)
Total Liabilities and Partners' Capital	113,292,995		117,654,392
Investment in Unconsolidated Joint Ventures	1,435,154		1,463,665
Distribution and Loss in Excess of investments in Unconsolidated Joint Ventures	(25,963,031)		(24,097,346)
Total Investment in Unconsolidated Joint Ventures (Net)	$ (24,527,877)		$ (22,633,681)
Total units/ condominiums
Total | property	690		865
Units to be retained | property	690		690
Total number of units sold | property	175		175
Investment Properties | Residential buildings
Total units/ condominiums
Total | property	687		862
Investment Properties | Commercial
Total units/ condominiums
Total | property	3		3
Hamilton Essex 81
ASSETS
Rental Properties	$ 5,614,141		$ 6,045,672
Cash & Cash Equivalents	997,622		709,651
Rent Receivable	211,562		208,605
Real Estate Tax Escrows	67,281		73,643
Prepaid Expenses & Other Assets	326,548		319,717
Total Assets	7,217,154		7,357,288
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable	9,968,975		9,955,186
Accounts Payable & Accrued Expense	165,149		105,777
Advance Rental Pmts & Security Deposits	309,790		282,378
Total Liabilities	10,443,914		10,343,341
Partners' Capital	(3,226,760)		(2,986,053)
Total Liabilities and Partners' Capital	$ 7,217,154		$ 7,357,288
Partners' Capital %-NERA	50.00%		50.00%
Distribution and Loss in Excess of investments in Unconsolidated Joint Ventures	$ (1,613,380)		$ (1,493,027)
Total units/ condominiums
Total	49		49				48
Units to be retained | property	49		49
Hamilton Essex 81 | Residential buildings
Total units/ condominiums
Total | property	48		48
Hamilton Essex 81 | Commercial
Total units/ condominiums
Total | property	1		1
Hamilton Essex Development
ASSETS
Rental Properties	$ 2,584,435		$ 2,586,925
Cash & Cash Equivalents	60,182		113,595
Rent Receivable	80,184		75,159
Prepaid Expenses & Other Assets	50,175		56,859
Total Assets	2,774,976		2,832,538
LIABILITIES AND PARTNERS' CAPITAL
Accounts Payable & Accrued Expense	1,500		1,713
Total Liabilities	1,500		1,713
Partners' Capital	2,773,476		2,830,825
Total Liabilities and Partners' Capital	$ 2,774,976		$ 2,832,538
Partners' Capital %-NERA	50.00%		50.00%
Investment in Unconsolidated Joint Ventures	$ 1,386,738		$ 1,415,411
Total units/ condominiums
Total | property	1		1
Units to be retained | property	1		1
Hamilton Essex Development | Commercial
Total units/ condominiums
Total | property	1		1
345 Franklin
ASSETS
Rental Properties	$ 4,650,472		$ 4,897,693
Cash & Cash Equivalents	374,750		217,415
Rent Receivable			3,531
Real Estate Tax Escrows	23,412		34,630
Prepaid Expenses & Other Assets	104,393		118,903
Total Assets	5,153,027		5,272,172
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable	8,565,993		8,785,710
Accounts Payable & Accrued Expense	124,185		64,101
Advance Rental Pmts & Security Deposits	335,465		303,449
Total Liabilities	9,025,643		9,153,260
Partners' Capital	(3,872,616)		(3,881,088)
Total Liabilities and Partners' Capital	$ 5,153,027		$ 5,272,172
Partners' Capital %-NERA	50.00%		50.00%
Distribution and Loss in Excess of investments in Unconsolidated Joint Ventures	$ (1,936,308)		$ (1,940,544)
Total units/ condominiums
Total	40		40								40
Units to be retained | property	40		40
345 Franklin | Residential buildings
Total units/ condominiums
Total | property	40		40
Hamilton 1025
ASSETS
Rental Properties	$ 76,659		$ 79,923
Cash & Cash Equivalents	16,853		13,122
Rent Receivable	4,931		4,898
Prepaid Expenses & Other Assets	1,049		630
Total Assets	99,492		98,573
LIABILITIES AND PARTNERS' CAPITAL
Accounts Payable & Accrued Expense	2,660		2,064
Total Liabilities	2,660		2,064
Partners' Capital	96,832		96,509
Total Liabilities and Partners' Capital	$ 99,492		$ 98,573
Partners' Capital %-NERA	50.00%		50.00%
Investment in Unconsolidated Joint Ventures	$ 48,416		$ 48,254
Total units/ condominiums
Total	176		176					176
Units to be retained	1		1					(49)
Total number of units sold | property	175		175
Hamilton 1025 | Residential buildings
Total units/ condominiums
Total | property	175		175
Hamilton 1025 | Commercial
Total units/ condominiums
Total | property	1		1
Hamilton Minuteman
ASSETS
Rental Properties	$ 4,324,746		$ 4,581,892
Cash & Cash Equivalents	251,310		252,822
Rent Receivable	2,589		16,493
Real Estate Tax Escrows	43,542		29,447
Prepaid Expenses & Other Assets	42,306		26,635
Total Assets	4,664,493		4,907,289
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable	5,932,827		5,924,643
Accounts Payable & Accrued Expense	74,550		53,140
Advance Rental Pmts & Security Deposits	192,370		195,781
Total Liabilities	6,199,747		6,173,564
Partners' Capital	(1,535,254)		(1,266,275)
Total Liabilities and Partners' Capital	$ 4,664,493		$ 4,907,289
Partners' Capital %-NERA	50.00%		50.00%
Distribution and Loss in Excess of investments in Unconsolidated Joint Ventures	$ (767,627)		$ (633,138)
Total units/ condominiums
Total	42		42						42
Units to be retained | property	42		42
Hamilton Minuteman | Residential buildings
Total units/ condominiums
Total | property	42		42
Hamilton on Main Apts
ASSETS
Rental Properties	$ 12,985,301		$ 13,896,435
Cash & Cash Equivalents	611,236		808,436
Rent Receivable	9,044		29,724
Real Estate Tax Escrows	139,831		70,172
Prepaid Expenses & Other Assets	248,929		176,283
Total Assets	13,994,341		14,981,050
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable	16,881,274		16,865,222
Accounts Payable & Accrued Expense	196,773		168,858
Advance Rental Pmts & Security Deposits	515,070		455,979
Total Liabilities	17,593,117		17,490,059
Partners' Capital	(3,598,776)		(2,509,009)
Total Liabilities and Partners' Capital	$ 13,994,341		$ 14,981,050
Partners' Capital %-NERA	50.00%		50.00%
Distribution and Loss in Excess of investments in Unconsolidated Joint Ventures	$ (1,799,388)		$ (1,254,505)
Total units/ condominiums
Total	148		148							280
Units to be retained | property	148		148
Hamilton on Main Apts | Residential buildings
Total units/ condominiums
Total | property	148		148
Dexter Park
ASSETS
Rental Properties	$ 74,525,027		$ 77,385,213
Cash & Cash Equivalents	2,088,673		1,890,452
Rent Receivable	140,146		136,897
Prepaid Expenses & Other Assets	2,635,666		2,792,920
Total Assets	79,389,512		82,205,482
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable	124,682,270		124,617,647		$ 82,000,000
Accounts Payable & Accrued Expense	816,401		702,566
Advance Rental Pmts & Security Deposits	3,506,661		3,825,600
Total Liabilities	129,005,332		129,145,813
Partners' Capital	(49,615,820)		(46,940,331)
Total Liabilities and Partners' Capital	$ 79,389,512		$ 82,205,482
Partners' Capital %-NERA	40.00%		40.00%
Distribution and Loss in Excess of investments in Unconsolidated Joint Ventures	$ (19,846,328)		$ (18,776,132)
Total units/ condominiums
Total	409		409			409
Units to be retained | property	409		409
Dexter Park | Residential buildings
Total units/ condominiums
Total | property	409		409