XML 75 R5.htm IDEA: XBRL DOCUMENT
v3.20.1

CONSOLIDATED STATEMENTS OF CHANGES IN PARTNER'S CAPITAL - USD ($) | 3 Months Ended | 12 Months Ended | 149 Months Ended
--- | --- | --- | ---
Dec. 31, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2019
Increase (Decrease) in Partners' Capital |  |  |  |  |  |  |  |
Balance |  | $ (35,624,010) |  | $ (35,315,177) | $ (35,624,010) | $ (35,315,177) | $ (34,224,725) |
Balance (in units) |  | 124,386 |  | 124,386 | 124,386 | 124,386 | 124,409 |
Distribution to Partners |  |  |  |  | $ (4,696,893) | $ (4,477,923) | $ (7,985,835) |
Stock Buyback |  |  |  |  | $ (4,050,137) |  | $ (42,548) | $ (44,324,000)
Stock Buyback (in units) |  |  |  |  | (2,408) |  | (23) |
Net income | $ 1,898,513 | $ 1,500,516 | $ 1,576,877 | $ 1,878,558 | $ 6,547,252 | 4,169,090 | $ 6,937,931 |
Balance | $ (37,823,788) |  | $ (35,624,010) |  | $ (37,823,788) | $ (35,624,010) | $ (35,315,177) | $ (37,823,788)
Balance (in units) | 121,978 |  | 124,386 |  | 121,978 | 124,386 | 124,386 | 121,978
Subtotal |  |  |  |  |  |  |  |
Increase (Decrease) in Partners' Capital |  |  |  |  |  |  |  |
Balance (in units) |  | 180,225 |  | 180,225 | 180,225 | 180,225 | 180,225 |
Balance (in units) | 180,225 |  | 180,225 |  | 180,225 | 180,225 | 180,225 | 180,225
General Partnership |  |  |  |  |  |  |  |
Increase (Decrease) in Partners' Capital |  |  |  |  |  |  |  |
Balance |  | $ (354,833) |  | $ (351,745) | $ (354,833) | $ (351,745) | $ (340,840) |
Balance (in units) |  | 1,802 |  | 1,802 | 1,802 | 1,802 | 1,802 |
Distribution to Partners |  |  |  |  | $ (46,969) | $ (44,779) | $ (79,858) |
Stock Buyback |  |  |  |  | (40,498) | (40,498) | (426) |
Net income |  |  |  |  | 65,473 | 41,691 | 69,379 |
Balance | $ (376,827) |  | $ (354,833) |  | $ (376,827) | $ (354,833) | $ (351,745) | $ (376,827)
Balance (in units) | 1,802 |  | 1,802 |  | 1,802 | 1,802 | 1,802 | 1,802
Treasury Units |  |  |  |  |  |  |  |
Increase (Decrease) in Partners' Capital |  |  |  |  |  |  |  |
Balance (in units) |  | 55,839 |  | 55,839 | 55,839 | 55,839 | 55,816 |
Stock Buyback (in units) |  |  |  |  | (2,408) |  | (23) |
Balance (in units) | 58,247 |  | 55,839 |  | 58,247 | 55,839 | 55,839 | 58,247
Class A |  |  |  |  |  |  |  |
Increase (Decrease) in Partners' Capital |  |  |  |  |  |  |  |
Balance |  | $ (28,527,352) |  | $ (28,280,285) | $ (28,527,352) | $ (28,280,285) | $ (27,407,924) |
Balance (in units) |  | 144,180 |  | 144,180 | 144,180 | 144,180 | 144,180 |
Distribution to Partners |  |  |  |  | $ (3,757,514) | $ (3,582,339) | $ (6,388,668) |
Stock Buyback |  |  |  |  | (3,240,181) |  | (34,038) |
Net income |  |  |  |  | 5,237,802 | 3,335,272 | 5,550,345 |
Balance | $ (30,287,245) |  | $ (28,527,352) |  | $ (30,287,245) | $ (28,527,352) | $ (28,280,285) | $ (30,287,245)
Balance (in units) | 144,180 |  | 144,180 |  | 144,180 | 144,180 | 144,180 | 144,180
Class B |  |  |  |  |  |  |  |
Increase (Decrease) in Partners' Capital |  |  |  |  |  |  |  |
Balance |  | $ (6,741,825) |  | $ (6,683,147) | $ (6,741,825) | $ (6,683,147) | $ (6,475,961) |
Balance (in units) |  | 34,243 |  | 34,243 | 34,243 | 34,243 | 34,243 |
Distribution to Partners |  |  |  |  | $ (892,410) | $ (850,805) | $ (1,517,309) |
Stock Buyback |  |  |  |  | (769,458) |  | (8,084) |
Net income |  |  |  |  | 1,243,978 | 792,127 | 1,318,207 |
Balance | $ (7,159,715) |  | $ (6,741,825) |  | $ (7,159,715) | $ (6,741,825) | $ (6,683,147) | $ (7,159,715)
Balance (in units) | 34,243 |  | 34,243 |  | 34,243 | 34,243 | 34,243 | 34,243

X
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
Name: | us-gaap_IncreaseDecreaseInPartnersCapitalRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669619-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(22)) -URI http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669625-108580 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(18)) -URI http://asc.fasb.org/extlink&oid=116637232&loc=SL114874131-224263 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(20)) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
Name: | us-gaap_NetIncomeLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of ownership interest of different classes of partners in limited partnership. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 272 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 272 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70434-108055 + Details
Name: | us-gaap_PartnersCapital
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Total distributions to each class of partners (i.e., general, limited and preferred partners). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 5 -Subparagraph (SAB Topic 4.F) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187171-122770 + Details
Name: | us-gaap_PartnersCapitalAccountDistributions
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Value of units that were previously issued and have been repurchased during the year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 272 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6828210&loc=d3e70191-108054 + Details
Name: | us-gaap_PartnersCapitalAccountTreasuryUnitsPurchases
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The number of each class of partnership units outstanding at the balance sheet date. Units represent shares of ownership of the general, limited, and preferred partners. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-04.16(a)) -URI http://asc.fasb.org/extlink&oid=6488278&loc=d3e603758-122996 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-04.16(b)) -URI http://asc.fasb.org/extlink&oid=6488278&loc=d3e603758-122996 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 5 -Subparagraph (SAB TOPIC 4.F) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187171-122770 + Details
Name: | us-gaap_PartnersCapitalAccountUnits
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Units that were previously issued and have been repurchased during the year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 5 -Subparagraph (SAB TOPIC 4.F) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187171-122770 + Details
Name: | us-gaap_PartnersCapitalAccountUnitsTreasury
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_PartnerTypeOfPartnersCapitalAccountAxis=nen_LimitedAndGeneralMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PartnerTypeOfPartnersCapitalAccountAxis=us-gaap_GeneralPartnerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PartnerTypeOfPartnersCapitalAccountAxis=nen_TreasuryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PartnerTypeOfPartnersCapitalAccountAxis=nen_LimitedClassAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PartnerTypeOfPartnersCapitalAccountAxis=nen_LimitedClassBMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |