INVESTMENT IN UNCONSOLIDATED JOINT VENTURES (Balance Sheet) (Details)	Mar. 31, 2020 USD ($) property	Dec. 31, 2019 USD ($)	Mar. 31, 2019 USD ($) property	Oct. 28, 2009 USD ($) item	Feb. 28, 2007 item	Oct. 03, 2005 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			$ 123,969,482
Assets held for sale			159,188
Cash & Cash Equivalents			3,136,730
Rent Receivable			434,186
Real Estate Tax Escrow			247,443
Prepaid Expenses & Other Assets			1,625,373
Total Assets			129,572,402
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable			166,471,297
Accounts Payable and Accrued Expenses			1,197,603
Advance Rental Payments and Security Deposits			3,723,576
Total Liabilities			171,392,476
Partners' Capital			(41,820,074)
Total Liabilities and Capital			129,572,402
Investment in Unconsolidated Joint Ventures	$ 1,460,406	$ 1,430,402	1,801,702
Distribution and Loss in Excess of investments in Unconsolidated Joint Venture	$ (19,525,528)	$ (19,970,089)	(18,858,645)
Total Investment in Unconsolidated Joint Ventures (Net)			$ (17,056,944)
Total units/ condominiums
Total | property			1,033
Units to be retained | property			690
Units to be sold | property			223
Through May 1, 2018
Total units/ condominiums
Total number of units sold | property			221
Unsold units | property			3
Units unsold with deposits for future sale | property			1
NERA 50%
LIABILITIES AND PARTNERS' CAPITAL
Partners' Capital % - NERA	50.00%		50.00%
NERA 40%
LIABILITIES AND PARTNERS' CAPITAL
Partners' Capital % - NERA	40.00%		40.00%
Residential buildings
Total units/ condominiums
Total | property			1,030
Commercial
Total units/ condominiums
Total | property			3
Investment Properties
ASSETS
Rental Properties	$ 119,448,740
Cash & Cash Equivalents	5,101,077
Rent Receivable	293,379
Real Estate Tax Escrow	220,453
Prepaid Expenses & Other Assets	2,246,237
Total Assets	127,309,886
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable	166,380,941
Accounts Payable and Accrued Expenses	1,036,550
Advance Rental Payments and Security Deposits	3,928,292
Total Liabilities	171,345,783
Partners' Capital	(44,035,897)
Total Liabilities and Capital	127,309,886
Investment in Unconsolidated Joint Ventures	1,460,406
Distribution and Loss in Excess of investments in Unconsolidated Joint Venture	(19,525,528)
Total Investment in Unconsolidated Joint Ventures (Net)	$ (18,065,122)
Total units/ condominiums
Total | property	865
Units to be retained | property	689
Units to be sold | property	175
Total number of units sold | property	175
Investment Properties | Residential buildings
Total units/ condominiums
Total | property	862
Investment Properties | Commercial
Total units/ condominiums
Total | property	3
Hamilton Essex 81
ASSETS
Rental Properties	$ 6,977,869		$ 7,117,613
Cash & Cash Equivalents	336,900		192,441
Rent Receivable	215,143		222,191
Real Estate Tax Escrow	62,924		72,624
Prepaid Expenses & Other Assets	311,711		274,111
Total Assets	7,904,547		7,878,980
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable	9,924,160		9,910,371
Accounts Payable and Accrued Expenses	82,063		84,485
Advance Rental Payments and Security Deposits	294,765		297,683
Total Liabilities	10,300,988		10,292,539
Partners' Capital	(2,396,441)		(2,413,559)
Total Liabilities and Capital	7,904,547		$ 7,878,980
Partners' Capital % - NERA			50.00%
Distribution and Loss in Excess of investments in Unconsolidated Joint Venture	$ (1,198,220)		$ (1,206,780)
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	$ 2,592,526		$ 2,595,015
Cash & Cash Equivalents	105,620		169,930
Rent Receivable	38,463		49,619
Prepaid Expenses & Other Assets	92,886		110,681
Total Assets	2,829,495		2,925,245
LIABILITIES AND PARTNERS' CAPITAL
Accounts Payable and Accrued Expenses	3,250		2,187
Total Liabilities	3,250		2,187
Partners' Capital	2,826,245		2,923,058
Total Liabilities and Capital	2,829,495		$ 2,925,245
Partners' Capital % - NERA			50.00%
Investment in Unconsolidated Joint Ventures	$ 1,413,123		$ 1,461,529
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	$ 5,597,090		$ 5,919,727
Cash & Cash Equivalents	387,085		213,656
Rent Receivable			4,437
Real Estate Tax Escrow	52,215		50,334
Prepaid Expenses & Other Assets	76,295		61,989
Total Assets	6,112,685		6,250,143
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable	9,249,198		9,442,200
Accounts Payable and Accrued Expenses	103,274		121,342
Advance Rental Payments and Security Deposits	312,134		283,486
Total Liabilities	9,664,606		9,847,028
Partners' Capital	(3,551,921)		(3,596,885)
Total Liabilities and Capital	6,112,685		$ 6,250,143
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	$ (1,775,961)		$ (1,798,443)
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	$ 87,267		$ 103,238
Assets held for sale			159,188
Cash & Cash Equivalents	11,568		51,285
Rent Receivable			2,441
Prepaid Expenses & Other Assets	1,682		30,377
Total Assets	100,517		346,529
LIABILITIES AND PARTNERS' CAPITAL
Accounts Payable and Accrued Expenses	5,948		10,844
Advance Rental Payments and Security Deposits			7,174
Total Liabilities	5,948		18,018
Partners' Capital	94,569		328,511
Total Liabilities and Capital	100,517		$ 346,529
Partners' Capital % - NERA			50.00%					50.00%
Investment in Unconsolidated Joint Ventures	$ 47,284		$ 164,256					$ 2,352,000
Total units/ condominiums
Total	176		176					176
Units to be retained			1					(49)
Units to be sold | property	175		175
Total number of units sold | property	175
Hamilton 1025 | Through May 1, 2018
Total units/ condominiums
Total number of units sold | property			173
Unsold units | property			3
Units unsold with deposits for future sale | property			1
Hamilton 1025 | February 1, 2014
Total units/ condominiums
Unsold units | property			127
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 Bay Apts
ASSETS
Cash & Cash Equivalents			$ 359,291
Prepaid Expenses & Other Assets			3,595
Total Assets			362,886
LIABILITIES AND PARTNERS' CAPITAL
Accounts Payable and Accrued Expenses			10,951
Advance Rental Payments and Security Deposits			101
Total Liabilities			11,052
Partners' Capital			351,834
Total Liabilities and Capital			$ 362,886
Partners' Capital % - NERA			50.00%			50.00%
Investment in Unconsolidated Joint Ventures			$ 175,917			$ 2,500,000
Total units/ condominiums
Total			48			168
Units to be retained			0		(48)	(48)
Units to be sold | property			48
Hamilton Bay Apts | Through May 1, 2018
Total units/ condominiums
Total number of units sold | property			48
Hamilton Bay Apts | Residential buildings
Total units/ condominiums
Total | property			48
Hamilton Minuteman
ASSETS
Rental Properties	$ 5,240,627		$ 5,556,929
Cash & Cash Equivalents	234,919		132,903
Rent Receivable	205		1,487
Real Estate Tax Escrow	27,345		28,960
Prepaid Expenses & Other Assets	19,098		16,287
Total Assets	5,522,194		5,736,566
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable	5,906,230		5,898,047
Accounts Payable and Accrued Expenses	50,102		61,051
Advance Rental Payments and Security Deposits	137,848		123,167
Total Liabilities	6,094,180		6,082,265
Partners' Capital	(571,986)		(345,699)
Total Liabilities and Capital	5,522,194		$ 5,736,566
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	$ (285,993)		$ (172,850)
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			$ 16,490,749
Cash & Cash Equivalents			163,789
Rent Receivable			17,049
Real Estate Tax Escrow			95,525
Prepaid Expenses & Other Assets			105,663
Total Assets			16,872,775
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable	$ 16,829,107		16,813,056
Accounts Payable and Accrued Expenses			205,044
Advance Rental Payments and Security Deposits			391,075
Total Liabilities			17,409,175
Partners' Capital			(536,400)
Total Liabilities and Capital			$ 16,872,775
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			$ (268,200)
Total units/ condominiums
Total			148							280
Units to be retained | property			148
Hamilton on Main Apts | NERA 50%
ASSETS
Rental Properties	15,722,824
Cash & Cash Equivalents	514,145
Rent Receivable	12,553
Real Estate Tax Escrow	77,969
Prepaid Expenses & Other Assets	185,332
Total Assets	16,512,823
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable	16,829,107
Accounts Payable and Accrued Expenses	152,433
Advance Rental Payments and Security Deposits	439,382
Total Liabilities	17,420,922
Partners' Capital	(908,099)
Total Liabilities and Capital	$ 16,512,823
Partners' Capital % - NERA	50.00%
Distribution and Loss in Excess of investments in Unconsolidated Joint Venture	$ (454,050)
Total units/ condominiums
Total | property	148
Units to be retained | property	148
Hamilton on Main Apts | Residential buildings
Total units/ condominiums
Total | property			148
Hamilton on Main Apts | Residential buildings | NERA 50%
Total units/ condominiums
Total | property	148
Dexter Park
ASSETS
Rental Properties			$ 86,186,211
Cash & Cash Equivalents			1,853,435
Rent Receivable			136,962
Prepaid Expenses & Other Assets			1,022,670
Total Assets			89,199,278
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable	$ 124,472,246		124,407,623
Accounts Payable and Accrued Expenses			701,699
Advance Rental Payments and Security Deposits			2,620,890
Total Liabilities			127,730,212
Partners' Capital			(38,530,934)
Total Liabilities and Capital			$ 89,199,278
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			$ (15,412,374)
Total units/ condominiums
Total			409	409
Units to be retained | property			409
Dexter Park | February 1, 2014
Total units/ condominiums
Unsold units | property			232
Dexter Park | NERA 40%
ASSETS
Rental Properties	83,230,537
Cash & Cash Equivalents	3,510,840
Rent Receivable	27,015
Prepaid Expenses & Other Assets	1,559,233
Total Assets	88,327,625
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable	124,472,246
Accounts Payable and Accrued Expenses	639,480
Advance Rental Payments and Security Deposits	2,744,163
Total Liabilities	127,855,889
Partners' Capital	(39,528,264)
Total Liabilities and Capital	$ 88,327,625
Partners' Capital % - NERA	40.00%
Distribution and Loss in Excess of investments in Unconsolidated Joint Venture	$ (15,811,306)
Total units/ condominiums
Total | property	409
Units to be retained | property	409
Dexter Park | Residential buildings
Total units/ condominiums
Total | property			409
Dexter Park | Residential buildings | NERA 40%
Total units/ condominiums
Total | property	409