XML 66 R65.htm IDEA: XBRL DOCUMENT
v3.19.3

SUBSEQUENT EVENTS (Details) |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 9 Months Ended | 132 Months Ended | 142 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 02, 2019 USD ($) item | Aug. 31, 2007 shares | Nov. 06, 2019 USD ($) $ / item shares | Sep. 30, 2007 shares | Mar. 31, 2019 shares | Dec. 31, 2007 shares | Jun. 30, 2019 shares | Sep. 30, 2019 USD ($) shares | Dec. 31, 2018 shares | Jun. 30, 2019 USD ($) $ / item | Nov. 01, 2019 USD ($) | Sep. 30, 2018 property
Subsequent events |  |  |  |  |  |  |  |  |  |  |  |
Number of units | property |  |  |  |  |  |  |  |  |  |  |  | 913
Number of depository receipts repurchased | shares |  | 1,418,234 |  | 1,418,234 |  | 1,418,234 | 1,418,234 |  | 1,418,234 |  |  |
Repurchase price of depository receipts (in dollars per receipt) | $ / item |  |  |  |  |  |  |  |  |  | 28.20 |  |
Total cost of repurchase |  |  |  |  |  |  |  | $ 3,680,570 |  | $ 43,954,000 |  |
Units required to be repurchased (in shares) | shares |  |  |  |  |  |  |  | 2,205 |  |  |  |
Subsequent event |  |  |  |  |  |  |  |  |  |  |  |
Subsequent events |  |  |  |  |  |  |  |  |  |  |  |
Number of depository receipts repurchased | shares |  |  | 1,879 |  |  |  |  |  |  |  |  |
Repurchase price of depository receipts (in dollars per receipt) | $ / item |  |  | 59.98 |  |  |  |  |  |  |  |  |
Price per unit of depository receipts | $ / item |  |  | 1,769.40 |  |  |  |  |  |  |  |  |
Total cost of repurchase |  |  | $ 110,860 |  |  |  |  |  |  |  |  |
Subsequent event | 57 Mill Street |  |  |  |  |  |  |  |  |  |  |  |
Subsequent events |  |  |  |  |  |  |  |  |  |  |  |
Number of units | item | 181 |  |  |  |  |  |  |  |  |  |  |
Aggregate purchase price | $ 59,550,000 |  |  |  |  |  |  |  |  |  |  |
Termination period | 45 days |  |  |  |  |  |  |  |  |  |  |
Purchase deposit | $ 600,000 |  |  |  |  |  |  |  |  |  |  |
Interest rate lock deposit |  |  |  |  |  |  |  |  |  |  | $ 630,000 |
Mortgage amount |  |  |  |  |  |  |  |  |  |  | $ 31,000,000 |
Class B |  |  |  |  |  |  |  |  |  |  |  |
Subsequent events |  |  |  |  |  |  |  |  |  |  |  |
Number of depository receipts repurchased | shares |  | 3,491 |  | 3,491 | 3,491 |  |  |  | 3,491 |  |  |
Total cost of repurchase |  |  |  |  |  |  |  | $ 699,259 |  |  |  |
Class B | Subsequent event |  |  |  |  |  |  |  |  |  |  |  |
Subsequent events |  |  |  |  |  |  |  |  |  |  |  |
Units required to be repurchased (in shares) | shares |  |  | 15 |  |  |  |  |  |  |  |  |
Value of units required to be repurchased |  |  | $ 26,320 |  |  |  |  |  |  |  |  |
General Partnership |  |  |  |  |  |  |  |  |  |  |  |
Subsequent events |  |  |  |  |  |  |  |  |  |  |  |
Number of depository receipts repurchased | shares |  | 184 |  | 184 | 184 |  |  |  | 184 |  |  |
Total cost of repurchase |  |  |  |  |  |  |  | 36,803 |  |  |  |
Value of units required to be repurchased |  |  |  |  |  |  |  | $ 36,803 |  |  |  |
General Partnership | Subsequent event |  |  |  |  |  |  |  |  |  |  |  |
Subsequent events |  |  |  |  |  |  |  |  |  |  |  |
Units required to be repurchased (in shares) | shares |  |  | 1 |  |  |  |  |  |  |  |  |
Value of units required to be repurchased |  |  | $ 1,018 |  |  |  |  |  |  |  |  |

X
- Definition The period of time in which an agreement can be canceled. + References No definition available. + Details
Name: | nen_ContractTerminationPeriod
Namespace Prefix: | nen_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition A deposit made to lock in an interest rate. + References No definition available. + Details
Name: | nen_IntererestRateLockDeposit
Namespace Prefix: | nen_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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: | srt-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: | srt-types:perUnitItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the value of the units required to be repurchased. + References No definition available. + Details
Name: | nen_UnitRepurchasesRequiredValue
Namespace Prefix: | nen_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 + Details
Name: | us-gaap_DebtInstrumentFaceAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition A deposit made by a purchaser of real estate to evidence good faith. It is customary for a buyer to give the seller earnest money at the time a sales contract is signed. The earnest money generally is credited to the down payment at closing, which is applied at closing as a component of payment against the purchase price. + References No definition available. + Details
Name: | us-gaap_EarnestMoneyDeposits
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This element represents the aggregate cost of investments accounted for under the equity method of accounting. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_EquityMethodInvestmentAggregateCost
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The number of units in a real estate property owned as of the balance sheet date. + References No definition available. + Details
Name: | us-gaap_NumberOfUnitsInRealEstateProperty
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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 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_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=nen_FiftySevenMillStreetMember
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: |