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QUARTERLY FINANCIAL DATA (UNAUDITED) (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
QUARTERLY FINANCIAL DATA (UNAUDITED)
Revenue	$ 10,810,827us-gaap_Revenues	$ 10,643,029us-gaap_Revenues	$ 10,560,535us-gaap_Revenues	$ 10,617,928us-gaap_Revenues	$ 10,374,345us-gaap_Revenues	$ 9,967,752us-gaap_Revenues	$ 9,002,762us-gaap_Revenues	$ 9,019,693us-gaap_Revenues	$ 42,632,319us-gaap_Revenues	$ 38,364,552us-gaap_Revenues	$ 35,169,170us-gaap_Revenues
Expenses	7,924,264us-gaap_OperatingExpenses	7,916,421us-gaap_OperatingExpenses	7,835,735us-gaap_OperatingExpenses	8,053,306us-gaap_OperatingExpenses	7,654,735us-gaap_OperatingExpenses	7,484,223us-gaap_OperatingExpenses	6,113,940us-gaap_OperatingExpenses	5,980,237us-gaap_OperatingExpenses	31,729,726us-gaap_OperatingExpenses	27,233,135us-gaap_OperatingExpenses	22,389,427us-gaap_OperatingExpenses
Income Before Other Income	2,886,563us-gaap_OperatingIncomeLoss	2,726,608us-gaap_OperatingIncomeLoss	2,724,800us-gaap_OperatingIncomeLoss	2,564,622us-gaap_OperatingIncomeLoss	2,719,610us-gaap_OperatingIncomeLoss	2,483,529us-gaap_OperatingIncomeLoss	2,888,822us-gaap_OperatingIncomeLoss	3,039,456us-gaap_OperatingIncomeLoss	10,902,593us-gaap_OperatingIncomeLoss	11,131,417us-gaap_OperatingIncomeLoss	12,779,743us-gaap_OperatingIncomeLoss
Income (Loss) From Discontinued Operations					(113)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	(654)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	3,678,922us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	19,731us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity		3,697,886us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	33,348us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity
Other Income (Loss)	(2,295,307)us-gaap_NonoperatingIncomeExpense	(2,545,121)us-gaap_NonoperatingIncomeExpense	(2,443,079)us-gaap_NonoperatingIncomeExpense	(2,594,236)us-gaap_NonoperatingIncomeExpense	(2,401,979)us-gaap_NonoperatingIncomeExpense	(2,515,749)us-gaap_NonoperatingIncomeExpense	(2,098,628)us-gaap_NonoperatingIncomeExpense	(2,157,562)us-gaap_NonoperatingIncomeExpense	(9,877,743)us-gaap_NonoperatingIncomeExpense	(9,173,918)us-gaap_NonoperatingIncomeExpense	(9,179,293)us-gaap_NonoperatingIncomeExpense
Net Income (Loss)	$ 591,256us-gaap_NetIncomeLoss	$ 181,487us-gaap_NetIncomeLoss	$ 281,721us-gaap_NetIncomeLoss	$ (29,614)us-gaap_NetIncomeLoss	$ 317,518us-gaap_NetIncomeLoss	$ (32,874)us-gaap_NetIncomeLoss	$ 4,469,116us-gaap_NetIncomeLoss	$ 901,625us-gaap_NetIncomeLoss	$ 1,024,850us-gaap_NetIncomeLoss	$ 5,655,385us-gaap_NetIncomeLoss	$ 3,633,798us-gaap_NetIncomeLoss
Income (loss) before discontinued operations	$ 4.60us-gaap_IncomeLossFromContinuingOperationsPerOutstandingLimitedPartnershipUnitBasicNetOfTax	$ 1.41us-gaap_IncomeLossFromContinuingOperationsPerOutstandingLimitedPartnershipUnitBasicNetOfTax	$ 2.18us-gaap_IncomeLossFromContinuingOperationsPerOutstandingLimitedPartnershipUnitBasicNetOfTax	$ (0.23)us-gaap_IncomeLossFromContinuingOperationsPerOutstandingLimitedPartnershipUnitBasicNetOfTax	$ 2.45us-gaap_IncomeLossFromContinuingOperationsPerOutstandingLimitedPartnershipUnitBasicNetOfTax	$ (0.25)us-gaap_IncomeLossFromContinuingOperationsPerOutstandingLimitedPartnershipUnitBasicNetOfTax	$ 6.08us-gaap_IncomeLossFromContinuingOperationsPerOutstandingLimitedPartnershipUnitBasicNetOfTax	$ 6.77us-gaap_IncomeLossFromContinuingOperationsPerOutstandingLimitedPartnershipUnitBasicNetOfTax	$ 7.96us-gaap_IncomeLossFromContinuingOperationsPerOutstandingLimitedPartnershipUnitBasicNetOfTax	$ 15.07us-gaap_IncomeLossFromContinuingOperationsPerOutstandingLimitedPartnershipUnitBasicNetOfTax	$ 27.44us-gaap_IncomeLossFromContinuingOperationsPerOutstandingLimitedPartnershipUnitBasicNetOfTax
Income (Loss) from discontinued operations	$ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerOutstandingLimitedPartnershipUnitBasic	$ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerOutstandingLimitedPartnershipUnitBasic	$ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerOutstandingLimitedPartnershipUnitBasic	$ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerOutstandingLimitedPartnershipUnitBasic		$ (0.01)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerOutstandingLimitedPartnershipUnitBasic	$ 28.29us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerOutstandingLimitedPartnershipUnitBasic	$ 0.15us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerOutstandingLimitedPartnershipUnitBasic	$ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerOutstandingLimitedPartnershipUnitBasic	$ 28.48us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerOutstandingLimitedPartnershipUnitBasic	$ 0.25us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerOutstandingLimitedPartnershipUnitBasic
Net Income (loss) per Unit	$ 4.60us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax	$ 1.41us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax	$ 2.18us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax	$ (0.23)us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax	$ 2.45us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax	$ (0.25)us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax	$ 34.37us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax	$ 6.93us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax	$ 7.96us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax	$ 43.55us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax	$ 27.69us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax
Income (Loss) per Depositary Receipt before Discontinued Operations	0.15nen_IncomeLossFromContinuingOperationsPerOutstandingDepositoryReceipt	0.05nen_IncomeLossFromContinuingOperationsPerOutstandingDepositoryReceipt	0.07nen_IncomeLossFromContinuingOperationsPerOutstandingDepositoryReceipt	(0.01)nen_IncomeLossFromContinuingOperationsPerOutstandingDepositoryReceipt	0.08nen_IncomeLossFromContinuingOperationsPerOutstandingDepositoryReceipt	(0.01)nen_IncomeLossFromContinuingOperationsPerOutstandingDepositoryReceipt	0.20nen_IncomeLossFromContinuingOperationsPerOutstandingDepositoryReceipt	0.23nen_IncomeLossFromContinuingOperationsPerOutstandingDepositoryReceipt	0.27nen_IncomeLossFromContinuingOperationsPerOutstandingDepositoryReceipt	0.50nen_IncomeLossFromContinuingOperationsPerOutstandingDepositoryReceipt
Income Per Depositary receipt From Discontinued Operations (in dollars per share)	0.00nen_IncomeLossFromDiscontinuedOperationsNetOfTaxPerOutstandingDepositoryReceipt	0.00nen_IncomeLossFromDiscontinuedOperationsNetOfTaxPerOutstandingDepositoryReceipt	0.00nen_IncomeLossFromDiscontinuedOperationsNetOfTaxPerOutstandingDepositoryReceipt	0.00nen_IncomeLossFromDiscontinuedOperationsNetOfTaxPerOutstandingDepositoryReceipt	0.00nen_IncomeLossFromDiscontinuedOperationsNetOfTaxPerOutstandingDepositoryReceipt	0.00nen_IncomeLossFromDiscontinuedOperationsNetOfTaxPerOutstandingDepositoryReceipt	0.94nen_IncomeLossFromDiscontinuedOperationsNetOfTaxPerOutstandingDepositoryReceipt	0.01nen_IncomeLossFromDiscontinuedOperationsNetOfTaxPerOutstandingDepositoryReceipt	0.00nen_IncomeLossFromDiscontinuedOperationsNetOfTaxPerOutstandingDepositoryReceipt	0.95nen_IncomeLossFromDiscontinuedOperationsNetOfTaxPerOutstandingDepositoryReceipt
Net Income (Loss) per Depositary Receipt after Discontinued Operations (in dollars per share)	0.15nen_NetIncomeLossPerOutstandingDepositoryReceipt	0.05nen_NetIncomeLossPerOutstandingDepositoryReceipt	0.07nen_NetIncomeLossPerOutstandingDepositoryReceipt	(0.01)nen_NetIncomeLossPerOutstandingDepositoryReceipt	0.08nen_NetIncomeLossPerOutstandingDepositoryReceipt	(0.01)nen_NetIncomeLossPerOutstandingDepositoryReceipt	1.15nen_NetIncomeLossPerOutstandingDepositoryReceipt	0.23nen_NetIncomeLossPerOutstandingDepositoryReceipt	0.27nen_NetIncomeLossPerOutstandingDepositoryReceipt	1.45nen_NetIncomeLossPerOutstandingDepositoryReceipt

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