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

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