XML 85 R74.htm IDEA: XBRL DOCUMENT
v3.19.1

SUBSEQUENT EVENTS (Details) |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended | 137 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Jan. 01, 2019 USD ($) shares | Sep. 29, 2017 USD ($) | Jan. 31, 2019 USD ($) | Oct. 31, 2018 USD ($) | Jul. 31, 2018 USD ($) | Mar. 31, 2019 USD ($) $ / item shares | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 USD ($) shares | Dec. 31, 2018 USD ($) $ / item shares | Feb. 24, 2019
Subsequent events |  |  |  |  |  |  |  |  |  |  |
Number of depository receipts repurchased | shares |  |  |  |  |  |  |  | 549 |  | 1,365,306 |
Repurchase price of depository receipts (in dollars per receipt) | $ / item |  |  |  |  |  |  |  |  |  | 27.14 |
Total cost of repurchase |  |  |  |  |  |  |  | $ 42,548 | $ 1,634,945 | $ 40,274,000 |
Stock Buyback (in units) | shares |  |  |  |  |  |  |  | 23 | 965 |  |
Payment on line of credit |  |  |  |  |  |  | $ 15,000,000 | $ 24,000,000 | $ 25,000,000 |  |
Line of Credit |  |  |  |  |  |  |  |  |  |  |
Subsequent events |  |  |  |  |  |  |  |  |  |  |
Payment on line of credit |  | $ 8,000,000 |  | $ 3,000,000 | $ 4,000,000 |  |  |  |  |  |
Subsequent event |  |  |  |  |  |  |  |  |  |  |
Subsequent events |  |  |  |  |  |  |  |  |  |  |
Number of depository receipts repurchased | shares |  |  |  |  |  | 41,900 |  |  |  |  |
Repurchase price of depository receipts (in dollars per receipt) | $ / item |  |  |  |  |  | 54.11 |  |  |  |  |
Price per unit of depository receipts | $ / item |  |  |  |  |  | 1,623.00 |  |  |  |  |
Total cost of repurchase |  |  |  |  |  | $ 2,267,072 |  |  |  |  |
Payment on line of credit |  |  | $ 2,000,000 |  |  |  |  |  |  |  |
Percent of outstanding voting securities |  |  |  |  |  |  |  |  |  |  | 75.00%
Subsequent event | President |  |  |  |  |  |  |  |  |  |  |
Subsequent events |  |  |  |  |  |  |  |  |  |  |
Number of depository receipts repurchased | shares |  |  |  |  |  | 40,000 |  |  |  |  |
Class B |  |  |  |  |  |  |  |  |  |  |
Subsequent events |  |  |  |  |  |  |  |  |  |  |
Number of depository receipts repurchased | shares |  |  |  |  |  |  |  |  |  | 3,072 |
Total cost of repurchase |  |  |  |  |  |  |  | 8,084 | 307,436 |  |
Class B | Subsequent event |  |  |  |  |  |  |  |  |  |  |
Subsequent events |  |  |  |  |  |  |  |  |  |  |
Total cost of repurchase | $ 538,421 |  |  |  |  |  |  |  |  |  |
Stock Buyback (in units) | shares | 332 |  |  |  |  |  |  |  |  |  |
General Partnership |  |  |  |  |  |  |  |  |  |  |
Subsequent events |  |  |  |  |  |  |  |  |  |  |
Number of depository receipts repurchased | shares |  |  |  |  |  |  |  |  |  | 162 |
Total cost of repurchase |  |  |  |  |  |  |  | $ 426 | $ 16,181 |  |
General Partnership | Subsequent event |  |  |  |  |  |  |  |  |  |  |
Subsequent events |  |  |  |  |  |  |  |  |  |  |
Total cost of repurchase | $ 28,338 |  |  |  |  |  |  |  |  |  |
Stock Buyback (in units) | shares | 17 |  |  |  |  |  |  |  |  |  |

X
- Definition Represents the percentage of ownership of combined voting power held by an owner. + References No definition available. + Details
Name: | nen_OwnershipPercentageOfCombinedVotingPowerHeldByOwner
Namespace Prefix: | nen_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the number of depository receipts repurchased under the equity repurchase program. + References No definition available. + Details
Name: | nen_PartnersCapitalAccountDepositoryReceiptsTreasury
Namespace Prefix: | nen_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the average price at which depository receipts are repurchased under the equity repurchase program. + References No definition available. + Details
Name: | nen_PartnersCapitalAccountDepositoryReceiptsTreasuryAverageRepurchasePricePerDepositoryReceipt
Namespace Prefix: | nen_
Data Type: | us-types:perUnitItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the cost per unit of depository receipts. + References No definition available. + Details
Name: | nen_PartnersCapitalAccountDepositoryReciptsTreasuryPricePerUnit
Namespace Prefix: | nen_
Data Type: | us-types:perUnitItemType
Balance Type: | na
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 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
- Definition The cash outflow for the settlement of obligation drawn from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + Details
Name: | us-gaap_RepaymentsOfLongTermLinesOfCredit
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_LineOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=us-gaap_PresidentMember
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: |

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