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INVESTMENT IN UNCONSOLIDATED JOINT VENTURES (Details 2) (USD $)	0 Months Ended	12 Months Ended
	Feb. 01, 2015 item	Dec. 31, 2014 item	Dec. 31, 2013 item	Dec. 31, 2012 item	Dec. 31, 2011	Nov. 30, 2001 item	Mar. 02, 2005 item	Apr. 30, 2008 item	Feb. 28, 2007 item	Oct. 03, 2005 item	Sep. 30, 2004 item	May 31, 2008 item	Aug. 31, 2004 item	Oct. 28, 2009
ASSETS
Rental Properties		$ 149,116,084us-gaap_RentalProperties	$ 152,904,661us-gaap_RentalProperties
Cash & Cash Equivalents		14,015,898	14,013,380	6,981,906	4,050,157
Rent Receivable		474,225us-gaap_AccountsReceivableNet	496,149us-gaap_AccountsReceivableNet
Real Estate Tax Escrow		340,341us-gaap_EscrowDeposit	375,560us-gaap_EscrowDeposit
Prepaid Expenses & Other Assets		3,287,005us-gaap_PrepaidExpenseAndOtherAssets	3,895,189us-gaap_PrepaidExpenseAndOtherAssets
Financing & Leasing Fees		1,735,652nen_DeferredFinancingAndLeasingCostsNet	1,635,076nen_DeferredFinancingAndLeasingCostsNet
Total Assets		177,777,073us-gaap_Assets	185,345,157us-gaap_Assets
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable		196,071,540us-gaap_SecuredDebt	198,520,478us-gaap_SecuredDebt
Accounts Payable and Accrued Expenses		3,099,117	3,178,495
Advance Rental Payments and Security Deposits		4,548,729us-gaap_CustomerAdvancesAndDeposits	4,242,401us-gaap_CustomerAdvancesAndDeposits
Total Liabilities		205,144,755us-gaap_Liabilities	207,193,720us-gaap_Liabilities
Partners' Capital		(27,367,682)us-gaap_PartnersCapital	(21,848,563)us-gaap_PartnersCapital	(22,515,677)us-gaap_PartnersCapital	(21,310,851)us-gaap_PartnersCapital
Total Liabilities and Partners' Capital		177,777,073	185,345,157
Investment in Unconsolidated Joint Ventures		8,807,868us-gaap_EquityMethodInvestments	12,025,142us-gaap_EquityMethodInvestments
Distribution and Loss in Excess of Investment in Unconsolidated Joint Venture		(1,425,369)	(1,252,346)
Hamilton Essex 81
ASSETS
Rental Properties		8,732,134	8,764,215	9,103,858
Cash & Cash Equivalents		759	30,360	27,848
Rent Receivable		44,399	31,426	44,005
Real Estate Tax Escrow		105,474	101,395	49,793
Prepaid Expenses & Other Assets		83,881	77,141	61,895
Financing & Leasing Fees		30,109	46,630	64,116
Total Assets		8,996,756	9,051,167	9,351,515
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable		8,109,676	8,234,548	8,352,317
Accounts Payable and Accrued Expenses		49,426	44,299	34,673
Advance Rental Payments and Security Deposits		174,186	167,143	175,871
Total Liabilities		8,333,288	8,445,990	8,562,861
Partners' Capital		663,468	605,177	788,654
Total Liabilities and Partners' Capital		8,996,756	9,051,167	9,351,515
Distribution and Loss in Excess of Investment in Unconsolidated Joint Venture		0
Total Investment in Unconsolidated Joint Ventures (Net)		0
Total units/ condominiums
Total		49	49	49
Units to be retained		49	49	49
Units to be sold		0
Units sold		0
Units unsold with deposits for future sale		0
Hamilton Essex 81 \| NERA 50%
LIABILITIES AND PARTNERS' CAPITAL
Percentage of ownership interest		50.00%	50.00%	50.00%
Investment in Unconsolidated Joint Ventures		331,734	302,589	394,327
Hamilton Essex 81 \| Residential buildings
Total units/ condominiums
Total		48	48	48
Hamilton Essex 81 \| Commercial
Total units/ condominiums
Total		1	1	1
Hamilton Essex Development
ASSETS
Rental Properties		2,621,495	2,624,325	2,610,574
Cash & Cash Equivalents		4,216	35,644	20,214
Rent Receivable		0
Real Estate Tax Escrow		0
Prepaid Expenses & Other Assets		559	555	505
Financing & Leasing Fees		5,639	14,097	4,325
Total Assets		2,631,909	2,674,621	2,635,617
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable		1,987,830	2,041,146	2,093,184
Accounts Payable and Accrued Expenses		6,088	6,084	6,319
Advance Rental Payments and Security Deposits		0	0
Total Liabilities		1,993,918	2,047,230	2,099,503
Partners' Capital		637,991	627,391	536,114
Total Liabilities and Partners' Capital		2,631,909	2,674,621	2,635,617
Distribution and Loss in Excess of Investment in Unconsolidated Joint Venture		0
Total Investment in Unconsolidated Joint Ventures (Net)		0
Total units/ condominiums
Total		1	1	1
Units to be retained		1	1	1
Units to be sold		0
Units sold		0
Units unsold with deposits for future sale		0
Hamilton Essex Development \| NERA 50%
LIABILITIES AND PARTNERS' CAPITAL
Percentage of ownership interest		50.00%	50.00%	50.00%
Investment in Unconsolidated Joint Ventures		318,995	313,695	268,057
Hamilton Essex Development \| Residential buildings
Total units/ condominiums
Total		0
Hamilton Essex Development \| Commercial
Total units/ condominiums
Total		1	1	1
345 Franklin
ASSETS
Rental Properties		7,132,916	7,494,954	7,885,745
Cash & Cash Equivalents		111,875	78,691	3,533
Rent Receivable		2,116	1,512	600
Real Estate Tax Escrow		17,731	16,970	20,242
Prepaid Expenses & Other Assets		36,911	36,979	75,222
Financing & Leasing Fees		89,890	96,548	8,164
Total Assets		7,391,439	7,725,654	7,993,505
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable		10,000,000	10,000,000	6,850,179
Accounts Payable and Accrued Expenses		51,122	60,638	93,810
Advance Rental Payments and Security Deposits		191,054	169,709	140,759
Total Liabilities		10,242,176	10,230,346	7,084,748
Partners' Capital		(2,850,737)	(2,504,692)	908,757
Total Liabilities and Partners' Capital		7,391,439	7,725,654	7,993,505
Percentage of ownership interest						50.00%
Investment in Unconsolidated Joint Ventures		0				1,533,000
Total Investment in Unconsolidated Joint Ventures (Net)		0
Total units/ condominiums
Total		40	40	40		40
Units to be retained		40	40	40
Units to be sold		0
Units sold		0
Units unsold with deposits for future sale		0
345 Franklin \| NERA 50%
LIABILITIES AND PARTNERS' CAPITAL
Percentage of ownership interest		50.00%	50.00%	50.00%
Investment in Unconsolidated Joint Ventures				454,379
Distribution and Loss in Excess of Investment in Unconsolidated Joint Venture		(1,425,369)	(1,252,346)
345 Franklin \| Residential buildings
Total units/ condominiums
Total		40	40	40
345 Franklin \| Commercial
Total units/ condominiums
Total		0
Hamilton 1025
ASSETS
Rental Properties		5,156,752	5,389,763	5,621,970
Cash & Cash Equivalents		23,008	9,085	2,706
Rent Receivable		2,111	7,970	7,283
Real Estate Tax Escrow		75,027	80,767	74,443
Prepaid Expenses & Other Assets		45,704	44,737	33,659
Financing & Leasing Fees		9,594	14,619	19,645
Total Assets		5,312,196	5,546,941	5,759,706
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable		4,806,039	4,869,583	4,934,741
Accounts Payable and Accrued Expenses		28,751	50,279	49,566
Advance Rental Payments and Security Deposits		96,142	92,057	80,264
Total Liabilities		4,930,932	5,011,919	5,064,570
Partners' Capital		381,264	535,022	695,135
Total Liabilities and Partners' Capital		5,312,196	5,546,941	5,759,706
Percentage of ownership interest							50.00%
Investment in Unconsolidated Joint Ventures							2,352,000
Distribution and Loss in Excess of Investment in Unconsolidated Joint Venture		0
Total Investment in Unconsolidated Joint Ventures (Net)		0
Total units/ condominiums
Total		176	176	176			176
Units to be retained		49	49	49			49
Units to be sold		127	127	127
Units sold		127	127	127			127
Units unsold with deposits for future sale		0
Hamilton 1025 \| NERA 50%
LIABILITIES AND PARTNERS' CAPITAL
Percentage of ownership interest		50.00%	50.00%	50.00%
Investment in Unconsolidated Joint Ventures		190,632	267,511	347,568
Hamilton 1025 \| Residential buildings
Total units/ condominiums
Total		175	175	175
Hamilton 1025 \| Commercial
Total units/ condominiums
Total		1	1	1
Hamilton Bay Sales
ASSETS
Rental Properties		811,043	1,766,132	1,844,219
Cash & Cash Equivalents		28,636	36,423	20,695
Rent Receivable		1,770	1,251	2,200
Real Estate Tax Escrow		0
Prepaid Expenses & Other Assets		198,603	101,507	127,530
Financing & Leasing Fees		0		5,505
Total Assets		1,040,052	1,905,314	2,000,148
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable		0		1,668,000
Accounts Payable and Accrued Expenses		21,454	16,993	7,481
Advance Rental Payments and Security Deposits		10,999	24,687	25,147
Total Liabilities		32,453	41,680	1,700,628
Partners' Capital		1,007,599	1,863,634	299,520
Total Liabilities and Partners' Capital		1,040,052	1,905,314	2,000,148
Distribution and Loss in Excess of Investment in Unconsolidated Joint Venture		0
Total Investment in Unconsolidated Joint Ventures (Net)		0
Total units/ condominiums
Total		120	120	120
Units to be retained		0	0
Units to be sold		120	120	120
Units sold		113	105	105
Units left to sell	7	7	15	15
Units unsold with deposits for future sale		0
Hamilton Bay Sales \| NERA 50%
LIABILITIES AND PARTNERS' CAPITAL
Percentage of ownership interest		50.00%	50.00%	50.00%
Investment in Unconsolidated Joint Ventures		503,800	931,817	149,760
Hamilton Bay Sales \| Residential buildings
Total units/ condominiums
Total		120	120	120
Hamilton Bay Sales \| Commercial
Total units/ condominiums
Total		0
Hamilton Bay Apartments
ASSETS
Rental Properties		6,416,511	6,680,834	6,975,854
Cash & Cash Equivalents		32,379	17,861	62,473
Rent Receivable		945	2,766	2,686
Real Estate Tax Escrow		46,978	45,679	41,225
Prepaid Expenses & Other Assets		46,290	31,435	14,345
Financing & Leasing Fees		13,519	19,881	26,243
Total Assets		6,556,622	6,798,456	7,122,825
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable		4,574,002	4,639,848	4,702,087
Accounts Payable and Accrued Expenses		10,193	7,570	49,690
Advance Rental Payments and Security Deposits		99,043	85,413	86,028
Total Liabilities		4,683,238	4,732,831	4,837,806
Partners' Capital		1,873,384	2,065,625	2,285,019
Total Liabilities and Partners' Capital		6,556,622	6,798,456	7,122,825
Percentage of ownership interest										50.00%
Investment in Unconsolidated Joint Ventures										2,500,000
Distribution and Loss in Excess of Investment in Unconsolidated Joint Venture		0
Total Investment in Unconsolidated Joint Ventures (Net)		0
Total units/ condominiums
Total		48	48	48				20		168
Units to be retained		48	48	48					48	48
Units to be sold		0
Units sold		0
Units unsold with deposits for future sale		0
Hamilton Bay Apartments \| NERA 50%
LIABILITIES AND PARTNERS' CAPITAL
Percentage of ownership interest		50.00%	50.00%	50.00%
Investment in Unconsolidated Joint Ventures		936,692	1,032,812	1,142,510
Hamilton Bay Apartments \| Residential buildings
Total units/ condominiums
Total		48	48	48
Hamilton Bay Apartments \| Commercial
Total units/ condominiums
Total		0
Hamilton Minuteman
ASSETS
Rental Properties		6,551,038	6,778,029	7,020,471
Cash & Cash Equivalents		66,705	33,921	44,170
Rent Receivable		0		2,626
Real Estate Tax Escrow		40,532	41,268	43,612
Prepaid Expenses & Other Assets		44,736	50,721	48,715
Financing & Leasing Fees		8,012	11,981	15,950
Total Assets		6,711,023	6,915,919	7,175,545
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable		5,292,511	5,362,109	5,433,472
Accounts Payable and Accrued Expenses		52,095	73,289	58,378
Advance Rental Payments and Security Deposits		95,642	74,615	71,025
Total Liabilities		5,440,248	5,510,013	5,562,875
Partners' Capital		1,270,775	1,405,906	1,612,669
Total Liabilities and Partners' Capital		6,711,023	6,915,919	7,175,545
Percentage of ownership interest											50.00%
Investment in Unconsolidated Joint Ventures											5,075,000
Distribution and Loss in Excess of Investment in Unconsolidated Joint Venture		0
Total Investment in Unconsolidated Joint Ventures (Net)		0
Total units/ condominiums
Total		42	42	42							42
Units to be retained		42	42	42
Units to be sold		0
Units sold		0
Units unsold with deposits for future sale		0
Hamilton Minuteman \| NERA 50%
LIABILITIES AND PARTNERS' CAPITAL
Percentage of ownership interest		50.00%	50.00%	50.00%
Investment in Unconsolidated Joint Ventures		635,388	702,953	806,335
Hamilton Minuteman \| Residential buildings
Total units/ condominiums
Total		42	42	42
Hamilton Minuteman \| Commercial
Total units/ condominiums
Total		0
Hamilton on Main Apts
ASSETS
Rental Properties		19,408,575	20,253,587	21,148,813
Cash & Cash Equivalents		158,515	189,004	103,990
Rent Receivable		7,495	5,697	11,108
Real Estate Tax Escrow		62,290	72,308	70,364
Prepaid Expenses & Other Assets		71,703	322,667	154,396
Financing & Leasing Fees		155,162	7,716	14,581
Total Assets		19,863,740	20,850,980	21,503,252
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable		16,900,000	15,317,643	15,611,045
Accounts Payable and Accrued Expenses		156,578	290,008	204,413
Advance Rental Payments and Security Deposits		305,809	291,825	273,302
Total Liabilities		17,362,387	15,899,477	16,088,760
Partners' Capital		2,501,353	4,951,504	5,414,492
Total Liabilities and Partners' Capital		19,863,740	20,850,980	21,503,252
Percentage of ownership interest													50.00%
Investment in Unconsolidated Joint Ventures													8,000,000
Distribution and Loss in Excess of Investment in Unconsolidated Joint Venture		0
Total Investment in Unconsolidated Joint Ventures (Net)		0
Total units/ condominiums
Total		148	148	148									280
Units to be retained		148	148	148
Units to be sold		0
Units sold		0										137
Units unsold with deposits for future sale		0
Hamilton on Main Apts \| NERA 50%
LIABILITIES AND PARTNERS' CAPITAL
Percentage of ownership interest		50.00%	50.00%	50.00%
Investment in Unconsolidated Joint Ventures		1,250,676	2,475,752	2,707,246
Hamilton on Main Apts \| Residential buildings
Total units/ condominiums
Total		148	148	148
Hamilton on Main Apts \| Commercial
Total units/ condominiums
Total		0
Dexter Park
ASSETS
Rental Properties		97,142,777	102,120,964	107,496,918
Cash & Cash Equivalents		1,128,780	961,622	941,391
Rent Receivable		94,857	91,701	35,250
Real Estate Tax Escrow		294,748	427,084	424,159
Prepaid Expenses & Other Assets		1,917,136	1,529,591	1,367,274
Financing & Leasing Fees		281,222	340,362	399,678
Total Assets		100,859,520	105,471,324	110,664,670
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable		86,240,813	87,410,638	88,611,686
Accounts Payable and Accrued Expenses		793,995	944,140	843,422
Advance Rental Payments and Security Deposits		2,224,824	2,121,509	1,919,573
Total Liabilities		89,259,632	90,476,287	91,374,681
Partners' Capital		11,599,888	14,995,037	19,289,989
Total Liabilities and Partners' Capital		100,859,520	105,471,324	110,664,670
Percentage of ownership interest														40.00%
Investment in Unconsolidated Joint Ventures														15,925,000
Distribution and Loss in Excess of Investment in Unconsolidated Joint Venture		0
Total Investment in Unconsolidated Joint Ventures (Net)		0
Total units/ condominiums
Total		409	409	409
Units to be retained		409	409	409
Units to be sold		0
Units sold		0
Units unsold with deposits for future sale		0
Dexter Park \| NERA 40%
LIABILITIES AND PARTNERS' CAPITAL
Percentage of ownership interest		40.00%	40.00%	40.00%
Investment in Unconsolidated Joint Ventures		4,639,953	5,998,015	7,715,996
Dexter Park \| Residential buildings
Total units/ condominiums
Total		409	409	409										409
Dexter Park \| Commercial
Total units/ condominiums
Total		0
Total
ASSETS
Rental Properties		153,973,241	161,872,803	169,708,422
Cash & Cash Equivalents		1,554,873	1,392,611	1,227,018
Rent Receivable		153,693	142,324	105,758
Real Estate Tax Escrow		642,780	785,470	723,838
Prepaid Expenses & Other Assets		2,445,523	2,195,335	1,883,541
Financing & Leasing Fees		593,147	551,834	558,206
Total Assets		159,363,257	166,940,376	174,206,783
LIABILITIES AND PARTNERS' CAPITAL
Mortgage Notes Payable		137,910,871	137,875,517	138,256,711
Accounts Payable and Accrued Expenses		1,169,702	1,493,299	1,347,752
Advance Rental Payments and Security Deposits		3,197,699	3,026,957	2,771,968
Total Liabilities		142,278,272	142,395,772	142,376,432
Partners' Capital		17,084,985	24,544,604	31,830,352
Total Liabilities and Partners' Capital		159,363,257	166,940,376	174,206,783
Investment in Unconsolidated Joint Ventures		8,807,868	12,025,144
Distribution and Loss in Excess of Investment in Unconsolidated Joint Venture		(1,425,369)	(1,252,346)
Total Investment in Unconsolidated Joint Ventures (Net)		7,382,500	10,772,798	13,986,177
Total units/ condominiums
Total		1,034	1,033	1,033
Units to be retained		786	786	786
Units to be sold		247	247	247
Units sold		240	232	232
Units left to sell		7	15	15
Total \| NERA 50%
LIABILITIES AND PARTNERS' CAPITAL
Investment in Unconsolidated Joint Ventures				$ 13,986,177
Total \| Residential buildings
Total units/ condominiums
Total		1,031	1,030	1,030
Total \| Commercial
Total units/ condominiums
Total		3	3	3