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CONSOLIDATED STATEMENTS OF CHANGES IN PARTNERS' CAPITAL (USD $) | Subtotal | Class A USD ($) | Class B USD ($) | General Partnership USD ($) | Treasury Units | Total USD ($)
--- | --- | --- | --- | --- | --- | ---
Balance at Aug. 20, 2007 |  |  |  |  |  |
Increase (Decrease) in Partners' Capital |  |  |  |  |  |
Stock Buyback (in units) |  |  |  | (129)us-gaap_PartnersCapitalAccountUnitsTreasury / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_GeneralPartnerMember |  |
Balance at Dec. 31, 2013 |  |  |  | $ (218,160)us-gaap_PartnersCapital / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_GeneralPartnerMember |  |
Balance (in units) at Dec. 31, 2013 | 180,225 us-gaap_PartnersCapitalAccountUnits / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = nen_LimitedAndGeneralMember |  |  | 1,802 us-gaap_PartnersCapitalAccountUnits / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_GeneralPartnerMember |  |
Balance at Aug. 20, 2007 |  |  |  |  |  |
Increase (Decrease) in Partners' Capital |  |  |  |  |  |
Stock Buyback |  |  |  |  |  | (35,167,000)us-gaap_PartnersCapitalAccountTreasuryUnitsPurchases
Stock Buyback (in units) |  |  | (2,452)us-gaap_PartnersCapitalAccountUnitsTreasury / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = nen_LimitedClassBMember | (129)us-gaap_PartnersCapitalAccountUnitsTreasury / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_GeneralPartnerMember |  |
Balance at Dec. 31, 2014 |  |  | (5,184,335)us-gaap_PartnersCapital / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = nen_LimitedClassBMember | (272,859)us-gaap_PartnersCapital / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_GeneralPartnerMember |  | (27,367,682)us-gaap_PartnersCapital
Balance (in units) at Dec. 31, 2014 | 180,225 us-gaap_PartnersCapitalAccountUnits / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = nen_LimitedAndGeneralMember |  | 34,243 us-gaap_PartnersCapitalAccountUnits / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = nen_LimitedClassBMember | 1,802 us-gaap_PartnersCapitalAccountUnits / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_GeneralPartnerMember |  | 127,653 us-gaap_PartnersCapitalAccountUnits
Balance at Dec. 31, 2011 |  | (17,052,134)us-gaap_PartnersCapital / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = nen_LimitedClassAMember | (4,045,782)us-gaap_PartnersCapital / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = nen_LimitedClassBMember | (212,935)us-gaap_PartnersCapital / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_GeneralPartnerMember |  | (21,310,851)us-gaap_PartnersCapital
Balance (in units) at Dec. 31, 2011 | 180,225 us-gaap_PartnersCapitalAccountUnits / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = nen_LimitedAndGeneralMember | 144,180 us-gaap_PartnersCapitalAccountUnits / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = nen_LimitedClassAMember | 34,243 us-gaap_PartnersCapitalAccountUnits / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = nen_LimitedClassBMember | 1,802 us-gaap_PartnersCapitalAccountUnits / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_GeneralPartnerMember | 48,741 us-gaap_PartnersCapitalAccountUnits / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = nen_TreasuryMember | 131,484 us-gaap_PartnersCapitalAccountUnits
Increase (Decrease) in Partners' Capital |  |  |  |  |  |
Distribution to Partners |  | (3,145,928)us-gaap_PartnersCapitalAccountDistributions / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = nen_LimitedClassAMember | (747,158)us-gaap_PartnersCapitalAccountDistributions / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = nen_LimitedClassBMember | (39,324)us-gaap_PartnersCapitalAccountDistributions / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_GeneralPartnerMember |  | (3,932,410)us-gaap_PartnersCapitalAccountDistributions
Stock Buyback |  | (726,058)us-gaap_PartnersCapitalAccountTreasuryUnitsPurchases / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = nen_LimitedClassAMember | (171,148)us-gaap_PartnersCapitalAccountTreasuryUnitsPurchases / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = nen_LimitedClassBMember | (9,008)us-gaap_PartnersCapitalAccountTreasuryUnitsPurchases / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_GeneralPartnerMember |  | (906,214)us-gaap_PartnersCapitalAccountTreasuryUnitsPurchases
Stock Buyback (in units) |  |  |  |  | 1,040 us-gaap_PartnersCapitalAccountUnitsTreasury / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = nen_TreasuryMember | (1,040)us-gaap_PartnersCapitalAccountUnitsTreasury
Net income |  | 2,907,038 us-gaap_NetIncomeLoss / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = nen_LimitedClassAMember | 690,422 us-gaap_NetIncomeLoss / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = nen_LimitedClassBMember | 36,338 us-gaap_NetIncomeLoss / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_GeneralPartnerMember |  | 3,633,798 us-gaap_NetIncomeLoss
Balance at Dec. 31, 2012 |  | (18,017,082)us-gaap_PartnersCapital / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = nen_LimitedClassAMember | (4,273,666)us-gaap_PartnersCapital / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = nen_LimitedClassBMember | (224,929)us-gaap_PartnersCapital / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_GeneralPartnerMember |  | (22,515,677)us-gaap_PartnersCapital
Balance (in units) at Dec. 31, 2012 | 180,225 us-gaap_PartnersCapitalAccountUnits / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = nen_LimitedAndGeneralMember | 144,180 us-gaap_PartnersCapitalAccountUnits / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = nen_LimitedClassAMember | 34,243 us-gaap_PartnersCapitalAccountUnits / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = nen_LimitedClassBMember | 1,802 us-gaap_PartnersCapitalAccountUnits / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_GeneralPartnerMember | 49,781 us-gaap_PartnersCapitalAccountUnits / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = nen_TreasuryMember | 130,444 us-gaap_PartnersCapitalAccountUnits
Increase (Decrease) in Partners' Capital |  |  |  |  |  |
Distribution to Partners |  | (3,114,930)us-gaap_PartnersCapitalAccountDistributions / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = nen_LimitedClassAMember | (739,796)us-gaap_PartnersCapitalAccountDistributions / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = nen_LimitedClassBMember | (38,936)us-gaap_PartnersCapitalAccountDistributions / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_GeneralPartnerMember |  | (3,893,662)us-gaap_PartnersCapitalAccountDistributions
Stock Buyback |  | (877,623)us-gaap_PartnersCapitalAccountTreasuryUnitsPurchases / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = nen_LimitedClassAMember | (206,137)us-gaap_PartnersCapitalAccountTreasuryUnitsPurchases / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = nen_LimitedClassBMember | (10,849)us-gaap_PartnersCapitalAccountTreasuryUnitsPurchases / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_GeneralPartnerMember |  | (1,094,609)us-gaap_PartnersCapitalAccountTreasuryUnitsPurchases
Stock Buyback (in units) |  |  | (182)us-gaap_PartnersCapitalAccountUnitsTreasury / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = nen_LimitedClassBMember | (10)us-gaap_PartnersCapitalAccountUnitsTreasury / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_GeneralPartnerMember | 957 us-gaap_PartnersCapitalAccountUnitsTreasury / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = nen_TreasuryMember | (957)us-gaap_PartnersCapitalAccountUnitsTreasury
Net income |  | 4,524,308 us-gaap_NetIncomeLoss / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = nen_LimitedClassAMember | 1,074,523 us-gaap_NetIncomeLoss / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = nen_LimitedClassBMember | 56,554 us-gaap_NetIncomeLoss / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_GeneralPartnerMember |  | 5,655,385 us-gaap_NetIncomeLoss
Balance at Dec. 31, 2013 |  | (17,485,327)us-gaap_PartnersCapital / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = nen_LimitedClassAMember | (4,145,076)us-gaap_PartnersCapital / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = nen_LimitedClassBMember | (218,160)us-gaap_PartnersCapital / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_GeneralPartnerMember |  | (21,848,563)us-gaap_PartnersCapital
Balance (in units) at Dec. 31, 2013 | 180,225 us-gaap_PartnersCapitalAccountUnits / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = nen_LimitedAndGeneralMember | 144,180 us-gaap_PartnersCapitalAccountUnits / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = nen_LimitedClassAMember | 34,243 us-gaap_PartnersCapitalAccountUnits / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = nen_LimitedClassBMember | 1,802 us-gaap_PartnersCapitalAccountUnits / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_GeneralPartnerMember | 50,738 us-gaap_PartnersCapitalAccountUnits / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = nen_TreasuryMember | 129,487 us-gaap_PartnersCapitalAccountUnits
Increase (Decrease) in Partners' Capital |  |  |  |  |  |
Distribution to Partners |  | (3,086,709)us-gaap_PartnersCapitalAccountDistributions / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = nen_LimitedClassAMember | (733,093)us-gaap_PartnersCapitalAccountDistributions / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = nen_LimitedClassBMember | (38,584)us-gaap_PartnersCapitalAccountDistributions / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_GeneralPartnerMember |  | (3,858,386)us-gaap_PartnersCapitalAccountDistributions
Stock Buyback |  | (2,158,332)us-gaap_PartnersCapitalAccountTreasuryUnitsPurchases / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = nen_LimitedClassAMember | (500,888)us-gaap_PartnersCapitalAccountTreasuryUnitsPurchases / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = nen_LimitedClassBMember | (26,363)us-gaap_PartnersCapitalAccountTreasuryUnitsPurchases / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_GeneralPartnerMember |  | (2,685,583)us-gaap_PartnersCapitalAccountTreasuryUnitsPurchases
Stock Buyback (in units) |  |  | (349)us-gaap_PartnersCapitalAccountUnitsTreasury / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = nen_LimitedClassBMember | (18)us-gaap_PartnersCapitalAccountUnitsTreasury / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_GeneralPartnerMember | 1,834 us-gaap_PartnersCapitalAccountUnitsTreasury / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = nen_TreasuryMember | (1,834)us-gaap_PartnersCapitalAccountUnitsTreasury
Net income |  | 819,880 us-gaap_NetIncomeLoss / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = nen_LimitedClassAMember | 194,722 us-gaap_NetIncomeLoss / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = nen_LimitedClassBMember | 10,248 us-gaap_NetIncomeLoss / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_GeneralPartnerMember |  | 1,024,850 us-gaap_NetIncomeLoss
Balance at Dec. 31, 2014 |  | $ (21,910,488)us-gaap_PartnersCapital / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = nen_LimitedClassAMember | $ (5,184,335)us-gaap_PartnersCapital / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = nen_LimitedClassBMember | $ (272,859)us-gaap_PartnersCapital / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_GeneralPartnerMember |  | $ (27,367,682)us-gaap_PartnersCapital
Balance (in units) at Dec. 31, 2014 | 180,225 us-gaap_PartnersCapitalAccountUnits / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = nen_LimitedAndGeneralMember | 144,180 us-gaap_PartnersCapitalAccountUnits / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = nen_LimitedClassAMember | 34,243 us-gaap_PartnersCapitalAccountUnits / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = nen_LimitedClassBMember | 1,802 us-gaap_PartnersCapitalAccountUnits / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_GeneralPartnerMember | 52,572 us-gaap_PartnersCapitalAccountUnits / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = nen_TreasuryMember | 127,653 us-gaap_PartnersCapitalAccountUnits

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