INVESTMENT IN UNCONSOLIDATED JOINT VENTURES (Balance Sheet) (Details)	Mar. 31, 2022 USD ($) property	Dec. 31, 2021 USD ($)	Mar. 31, 2021 USD ($) property	Dec. 31, 2020 USD ($)	May 31, 2018 USD ($)	Oct. 28, 2009 USD ($) item	Mar. 07, 2005 item	Mar. 02, 2005 USD ($) item	Sep. 30, 2004 USD ($) item	Aug. 31, 2004 USD ($) item	Nov. 30, 2001 USD ($) item
ASSETS
Rental Properties	$ 248,407,550	$ 251,355,202
Cash and Cash Equivalents	92,265,466	96,083,508
Rents Receivable	625,819	935,303
Real Estate Tax Escrows	1,169,877	861,697
Prepaid Expenses and Other Assets	6,273,580	6,183,981
Total Assets	350,202,922	356,875,579
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable	369,970,778	370,481,390
Accounts Payable and Accrued Expenses	4,606,387	4,324,879
Advance Rental Payments and Security Deposits	8,317,801	8,369,497
Total Liabilities	406,312,059	406,168,186
Partners' Capital	(56,109,137)	(49,292,607)	$ (42,932,085)	$ (41,469,045)
Total Liabilities and Partners' Capital	350,202,922	356,875,579
Investment in Unconsolidated Joint Ventures	1,460,630	1,455,888
Distribution and Loss in Excess of investments in Unconsolidated Joint Venture	$ (23,417,093)	$ (22,992,420)
NERA 50%
LIABILITIES AND PARTNERS' CAPITAL
Partners' Capital % - NERA	50.00%
NERA 40%
LIABILITIES AND PARTNERS' CAPITAL
Partners' Capital % - NERA	40.00%
Investment Properties
ASSETS
Rental Properties	$ 110,566,922		114,497,085
Assets held for sale	0		0
Cash and Cash Equivalents	4,090,896		3,525,400
Rents Receivable	443,817		585,804
Real Estate Tax Escrows	263,053		281,173
Prepaid Expenses and Other Assets	2,725,776		2,028,812
Total Assets	118,090,464		120,918,274
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable	166,176,323		166,282,719
Accounts Payable and Accrued Expenses	1,229,811		1,149,977
Advance Rental Payments and Security Deposits	3,691,434		2,961,185
Total Liabilities	171,097,568		170,393,881
Partners' Capital	(53,007,104)		(49,475,607)
Total Liabilities and Partners' Capital	118,090,464		120,918,274
Investment in Unconsolidated Joint Ventures	1,460,630		1,400,524
Distribution and Loss in Excess of investments in Unconsolidated Joint Venture	(23,417,093)		(21,850,666)
Total Investment in Unconsolidated Joint Ventures (Net)	$ (21,956,463)		$ (20,450,142)
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	$ 6,158,533		$ 6,583,704
Cash and Cash Equivalents	579,073		66,579
Rents Receivable	218,440		31,379
Real Estate Tax Escrows	74,171		74,083
Prepaid Expenses and Other Assets	297,060		274,840
Total Assets	7,327,277		7,030,585
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable	9,951,738		9,937,949
Accounts Payable and Accrued Expenses	72,582		66,760
Advance Rental Payments and Security Deposits	210,186		102,170
Total Liabilities	10,234,506		10,106,879
Partners' Capital	(2,907,229)		(3,076,294)
Total Liabilities and Partners' Capital	7,327,277		$ 7,030,585
Partners' Capital % - NERA			50.00%
Distribution and Loss in Excess of investments in Unconsolidated Joint Venture	$ (1,453,616)		$ (1,538,147)
Total units/ condominiums
Total	49		49				48
Units to be retained | property	49		49
Hamilton Essex 81 | NERA 50%
LIABILITIES AND PARTNERS' CAPITAL
Partners' Capital % - NERA	50.00%
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	$ 2,587,547		$ 2,590,036
Cash and Cash Equivalents	112,861		40,821
Rents Receivable	71,993
Prepaid Expenses and Other Assets	59,537		75,119
Total Assets	2,831,938		2,705,976
LIABILITIES AND PARTNERS' CAPITAL
Accounts Payable and Accrued Expenses	3,750		4,000
Total Liabilities	3,750		4,000
Partners' Capital	2,828,188		2,701,976
Total Liabilities and Partners' Capital	2,831,938		$ 2,705,976
Partners' Capital % - NERA			50.00%
Investment in Unconsolidated Joint Ventures	$ 1,414,094		$ 1,350,988
Total units/ condominiums
Total | property	1		1
Units to be retained | property	1		1
Hamilton Essex Development | NERA 50%
LIABILITIES AND PARTNERS' CAPITAL
Partners' Capital % - NERA	50.00%
Hamilton Essex Development | Commercial
Total units/ condominiums
Total | property	1		1
345 Franklin
ASSETS
Rental Properties	$ 4,984,470		$ 5,289,712
Cash and Cash Equivalents	150,018		139,721
Rents Receivable	5,694		35,916
Real Estate Tax Escrows	68,049		54,505
Prepaid Expenses and Other Assets	104,028		85,816
Total Assets	5,312,259		5,605,670
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable	8,839,286		9,048,329
Accounts Payable and Accrued Expenses	94,711		106,469
Advance Rental Payments and Security Deposits	235,125		214,146
Total Liabilities	9,169,122		9,368,944
Partners' Capital	(3,856,863)		(3,763,274)
Total Liabilities and Partners' Capital	5,312,259		$ 5,605,670
Partners' Capital % - NERA			50.00%								50.00%
Investment in Unconsolidated Joint Ventures											$ 1,533,000
Distribution and Loss in Excess of investments in Unconsolidated Joint Venture	$ (1,928,433)		$ (1,881,637)
Total units/ condominiums
Total	40		40								40
Units to be retained | property	40		40
345 Franklin | NERA 50%
LIABILITIES AND PARTNERS' CAPITAL
Partners' Capital % - NERA	50.00%
345 Franklin | Residential buildings
Total units/ condominiums
Total | property	40		40
Hamilton 1025
ASSETS
Rental Properties	$ 80,739		$ 84,003
Cash and Cash Equivalents	9,501		6,435
Rents Receivable	6,525		11,669
Prepaid Expenses and Other Assets	207		191
Total Assets	96,972		102,298
LIABILITIES AND PARTNERS' CAPITAL
Accounts Payable and Accrued Expenses	3,901		3,225
Total Liabilities	3,901		3,225
Partners' Capital	93,071		99,073
Total Liabilities and Partners' Capital	96,972		$ 102,298
Partners' Capital % - NERA			50.00%					50.00%
Investment in Unconsolidated Joint Ventures	$ 46,536		$ 49,536					$ 2,352,000
Total units/ condominiums
Total	176		176					176
Units to be retained	1		1					(49)
Total number of units sold | property	175		175
Hamilton 1025 | NERA 50%
LIABILITIES AND PARTNERS' CAPITAL
Partners' Capital % - NERA	50.00%
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	$ 4,623,273		$ 4,914,411
Cash and Cash Equivalents	202,934		132,455
Rents Receivable	18,702		9,749
Real Estate Tax Escrows	32,369		38,883
Prepaid Expenses and Other Assets	17,181		15,187
Total Assets	4,894,459		5,110,685
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable	5,922,598		5,914,414
Accounts Payable and Accrued Expenses	75,931		75,274
Advance Rental Payments and Security Deposits	158,851		136,840
Total Liabilities	6,157,380		6,126,528
Partners' Capital	(1,262,921)		(1,015,843)
Total Liabilities and Partners' Capital	4,894,459		$ 5,110,685
Partners' Capital % - NERA			50.00%						50.00%
Investment in Unconsolidated Joint Ventures									$ 5,075,000
Distribution and Loss in Excess of investments in Unconsolidated Joint Venture	$ (631,462)		$ (507,922)
Total units/ condominiums
Total	42		42						42
Units to be retained | property	42		42
Hamilton Minuteman | NERA 50%
LIABILITIES AND PARTNERS' CAPITAL
Partners' Capital % - NERA	50.00%
Hamilton Minuteman | Residential buildings
Total units/ condominiums
Total | property	42		42
Hamilton on Main Apts
ASSETS
Rental Properties	$ 14,069,945		$ 14,982,149
Cash and Cash Equivalents	676,290		574,605
Rents Receivable	24,636		49,425
Real Estate Tax Escrows	88,464		113,702
Prepaid Expenses and Other Assets	190,308		177,044
Total Assets	15,049,643		15,896,925
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable	16,861,209		16,845,158
Accounts Payable and Accrued Expenses	186,788		172,092
Advance Rental Payments and Security Deposits	432,060		424,300
Total Liabilities	17,480,057		17,441,550
Partners' Capital	(2,430,414)		(1,544,625)
Total Liabilities and Partners' Capital	15,049,643		$ 15,896,925
Partners' Capital % - NERA			50.00%							50.00%
Investment in Unconsolidated Joint Ventures										$ 8,000,000
Distribution and Loss in Excess of investments in Unconsolidated Joint Venture	$ (1,215,208)		$ (772,313)
Total units/ condominiums
Total	148		148							280
Units to be retained | property	148		148
Hamilton on Main Apts | NERA 50%
LIABILITIES AND PARTNERS' CAPITAL
Partners' Capital % - NERA	50.00%
Hamilton on Main Apts | Residential buildings
Total units/ condominiums
Total | property	148		148
Dexter Park
ASSETS
Rental Properties	$ 78,062,415		$ 80,053,070
Cash and Cash Equivalents	2,360,219		2,564,784
Rents Receivable	97,827		447,666
Prepaid Expenses and Other Assets	2,057,455		1,400,615
Total Assets	82,577,916		84,466,135
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable	124,601,492		124,536,869		$ 82,000,000
Accounts Payable and Accrued Expenses	792,148		722,157
Advance Rental Payments and Security Deposits	2,655,212		2,083,729
Total Liabilities	128,048,852		127,342,755
Partners' Capital	(45,470,936)		(42,876,620)
Total Liabilities and Partners' Capital	82,577,916		$ 84,466,135
Partners' Capital % - NERA			40.00%			40.00%
Investment in Unconsolidated Joint Ventures						$ 15,925,000
Distribution and Loss in Excess of investments in Unconsolidated Joint Venture	$ (18,188,375)		$ (17,150,648)
Total units/ condominiums
Total	409		409			409
Units to be retained | property	409		409
Dexter Park | NERA 40%
LIABILITIES AND PARTNERS' CAPITAL
Partners' Capital % - NERA	40.00%
Dexter Park | Residential buildings
Total units/ condominiums
Total | property	409		409