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RENTAL INCOME (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 sqft item | Dec. 31, 2013 | Dec. 31, 2012
RENTAL INCOME |  |  |
Allowance for doubtful rent receivable | $ 366,000 nen_OperatingLeasesAllowanceForDoubtfulRentReceivable | $ 344,000 nen_OperatingLeasesAllowanceForDoubtfulRentReceivable |
Annual base rent for expiring leases | 2,978,995 nen_OperatingLeasesAnnualBaseRentForExpiringLeases |  |
Total square feet for expiring leases | 108,043 nen_OperatingLeasesSquareFeetForExpiringLeases |  |
Total number of leases expiring | 44 nen_OperatingLeasesNumberOfLeasesExpiring |  |
Percentage of annual base rent for expiring leases | 100.00%nen_OperatingLeasesPercentageOfAnnualBaseRentForExpiringLeases |  |
Recognizing rental income from non-cancelable commercial leases with future rental increases on a straight-line basis | 163,000 nen_OperatingLeasesRentalIncomeWithFutureRentalIncreases |  |
Deferred rental concession | 109,000 nen_OperatingLeasesDeferralOfRentalConcession |  |
Amortization of deferred rents | 2,000 nen_OperatingLeasesAmortizationOfDeferredRents |  |
Minimum future rental income |  |  |
2015 | 2,699,000 us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableCurrent |  |
2016 | 2,218,000 us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInTwoYears |  |
2017 | 1,510,000 us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInThreeYears |  |
2018 | 1,181,000 us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInFourYears |  |
2019 | 724,000 us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInFiveYears |  |
Thereafter | 746,000 us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableThereafter |  |
Commercial Property Leases | 9,078,000 us-gaap_OperatingLeasesFutureMinimumPaymentsReceivable |  |
Percentage of rental income related to residential apartments and condominium units with leases of one year or less | 92.00%nen_OperatingLeasesPercentageOfRentalIncomeRelatedToResidentialPropertyAndCondominiumUnits |  |
Maximum period of non-cancelable operating lease | 1 year |  |
Percentage of rental income related to commercial properties | 8.00%nen_OperatingLeasesPercentageOfRentalIncomeRelatedToCommercialProperty |  |
Aggregate contingent rentals from continuing operations | 638,000 us-gaap_OperatingLeasesIncomeStatementContingentRevenue | 670,000 us-gaap_OperatingLeasesIncomeStatementContingentRevenue | 661,000 us-gaap_OperatingLeasesIncomeStatementContingentRevenue
Through December 31, 2015 |  |  |
RENTAL INCOME |  |  |
Annual base rent for expiring leases | 452,620 nen_OperatingLeasesAnnualBaseRentForExpiringLeases / nen_OperatingLeasesExpirationPeriodAxis = nen_OperatingLeasesExpirationPeriodYearOneMember |  |
Total square feet for expiring leases | 21,266 nen_OperatingLeasesSquareFeetForExpiringLeases / nen_OperatingLeasesExpirationPeriodAxis = nen_OperatingLeasesExpirationPeriodYearOneMember |  |
Total number of leases expiring | 11 nen_OperatingLeasesNumberOfLeasesExpiring / nen_OperatingLeasesExpirationPeriodAxis = nen_OperatingLeasesExpirationPeriodYearOneMember |  |
Percentage of annual base rent for expiring leases | 16.00%nen_OperatingLeasesPercentageOfAnnualBaseRentForExpiringLeases / nen_OperatingLeasesExpirationPeriodAxis = nen_OperatingLeasesExpirationPeriodYearOneMember |  |
Through December 31, 2016 |  |  |
RENTAL INCOME |  |  |
Annual base rent for expiring leases | 628,628 nen_OperatingLeasesAnnualBaseRentForExpiringLeases / nen_OperatingLeasesExpirationPeriodAxis = nen_OperatingLeasesExpirationPeriodYearTwoMember |  |
Total square feet for expiring leases | 28,600 nen_OperatingLeasesSquareFeetForExpiringLeases / nen_OperatingLeasesExpirationPeriodAxis = nen_OperatingLeasesExpirationPeriodYearTwoMember |  |
Total number of leases expiring | 7 nen_OperatingLeasesNumberOfLeasesExpiring / nen_OperatingLeasesExpirationPeriodAxis = nen_OperatingLeasesExpirationPeriodYearTwoMember |  |
Percentage of annual base rent for expiring leases | 21.00%nen_OperatingLeasesPercentageOfAnnualBaseRentForExpiringLeases / nen_OperatingLeasesExpirationPeriodAxis = nen_OperatingLeasesExpirationPeriodYearTwoMember |  |
Through December 31, 2017 |  |  |
RENTAL INCOME |  |  |
Annual base rent for expiring leases | 569,511 nen_OperatingLeasesAnnualBaseRentForExpiringLeases / nen_OperatingLeasesExpirationPeriodAxis = nen_OperatingLeasesExpirationPeriodYearThreeMember |  |
Total square feet for expiring leases | 16,516 nen_OperatingLeasesSquareFeetForExpiringLeases / nen_OperatingLeasesExpirationPeriodAxis = nen_OperatingLeasesExpirationPeriodYearThreeMember |  |
Total number of leases expiring | 8 nen_OperatingLeasesNumberOfLeasesExpiring / nen_OperatingLeasesExpirationPeriodAxis = nen_OperatingLeasesExpirationPeriodYearThreeMember |  |
Percentage of annual base rent for expiring leases | 19.00%nen_OperatingLeasesPercentageOfAnnualBaseRentForExpiringLeases / nen_OperatingLeasesExpirationPeriodAxis = nen_OperatingLeasesExpirationPeriodYearThreeMember |  |
Through December 31, 2018 |  |  |
RENTAL INCOME |  |  |
Annual base rent for expiring leases | 298,551 nen_OperatingLeasesAnnualBaseRentForExpiringLeases / nen_OperatingLeasesExpirationPeriodAxis = nen_OperatingLeasesExpirationPeriodYearFourMember |  |
Total square feet for expiring leases | 8,707 nen_OperatingLeasesSquareFeetForExpiringLeases / nen_OperatingLeasesExpirationPeriodAxis = nen_OperatingLeasesExpirationPeriodYearFourMember |  |
Total number of leases expiring | 6 nen_OperatingLeasesNumberOfLeasesExpiring / nen_OperatingLeasesExpirationPeriodAxis = nen_OperatingLeasesExpirationPeriodYearFourMember |  |
Percentage of annual base rent for expiring leases | 10.00%nen_OperatingLeasesPercentageOfAnnualBaseRentForExpiringLeases / nen_OperatingLeasesExpirationPeriodAxis = nen_OperatingLeasesExpirationPeriodYearFourMember |  |
Through December 31, 2019 |  |  |
RENTAL INCOME |  |  |
Annual base rent for expiring leases | 742,785 nen_OperatingLeasesAnnualBaseRentForExpiringLeases / nen_OperatingLeasesExpirationPeriodAxis = nen_OperatingLeasesExpirationPeriodYearFiveMember |  |
Total square feet for expiring leases | 25,277 nen_OperatingLeasesSquareFeetForExpiringLeases / nen_OperatingLeasesExpirationPeriodAxis = nen_OperatingLeasesExpirationPeriodYearFiveMember |  |
Total number of leases expiring | 9 nen_OperatingLeasesNumberOfLeasesExpiring / nen_OperatingLeasesExpirationPeriodAxis = nen_OperatingLeasesExpirationPeriodYearFiveMember |  |
Percentage of annual base rent for expiring leases | 25.00%nen_OperatingLeasesPercentageOfAnnualBaseRentForExpiringLeases / nen_OperatingLeasesExpirationPeriodAxis = nen_OperatingLeasesExpirationPeriodYearFiveMember |  |
Through December 31, 2020 |  |  |
RENTAL INCOME |  |  |
Annual base rent for expiring leases | 64,657 nen_OperatingLeasesAnnualBaseRentForExpiringLeases / nen_OperatingLeasesExpirationPeriodAxis = nen_OperatingLeasesExpirationPeriodYearSixMember |  |
Total square feet for expiring leases | 1,106 nen_OperatingLeasesSquareFeetForExpiringLeases / nen_OperatingLeasesExpirationPeriodAxis = nen_OperatingLeasesExpirationPeriodYearSixMember |  |
Total number of leases expiring | 1 nen_OperatingLeasesNumberOfLeasesExpiring / nen_OperatingLeasesExpirationPeriodAxis = nen_OperatingLeasesExpirationPeriodYearSixMember |  |
Percentage of annual base rent for expiring leases | 2.00%nen_OperatingLeasesPercentageOfAnnualBaseRentForExpiringLeases / nen_OperatingLeasesExpirationPeriodAxis = nen_OperatingLeasesExpirationPeriodYearSixMember |  |
Through December 31, 2021 |  |  |
RENTAL INCOME |  |  |
Annual base rent for expiring leases | 64,800 nen_OperatingLeasesAnnualBaseRentForExpiringLeases / nen_OperatingLeasesExpirationPeriodAxis = nen_OperatingLeasesExpirationPeriodYearSevenMember |  |
Total square feet for expiring leases | 1,800 nen_OperatingLeasesSquareFeetForExpiringLeases / nen_OperatingLeasesExpirationPeriodAxis = nen_OperatingLeasesExpirationPeriodYearSevenMember |  |
Total number of leases expiring | 1 nen_OperatingLeasesNumberOfLeasesExpiring / nen_OperatingLeasesExpirationPeriodAxis = nen_OperatingLeasesExpirationPeriodYearSevenMember |  |
Percentage of annual base rent for expiring leases | 2.00%nen_OperatingLeasesPercentageOfAnnualBaseRentForExpiringLeases / nen_OperatingLeasesExpirationPeriodAxis = nen_OperatingLeasesExpirationPeriodYearSevenMember |  |
Through December 31, 2023 |  |  |
RENTAL INCOME |  |  |
Annual base rent for expiring leases | $ 157,443 nen_OperatingLeasesAnnualBaseRentForExpiringLeases / nen_OperatingLeasesExpirationPeriodAxis = nen_OperatingLeasesExpirationPeriodYearNineMember |  |
Total square feet for expiring leases | 4,771 nen_OperatingLeasesSquareFeetForExpiringLeases / nen_OperatingLeasesExpirationPeriodAxis = nen_OperatingLeasesExpirationPeriodYearNineMember |  |
Total number of leases expiring | 1 nen_OperatingLeasesNumberOfLeasesExpiring / nen_OperatingLeasesExpirationPeriodAxis = nen_OperatingLeasesExpirationPeriodYearNineMember |  |
Percentage of annual base rent for expiring leases | 5.00%nen_OperatingLeasesPercentageOfAnnualBaseRentForExpiringLeases / nen_OperatingLeasesExpirationPeriodAxis = nen_OperatingLeasesExpirationPeriodYearNineMember |  |

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- Definition Represents the amount resulting from recognizing rental income from non-cancelable commercial leases with future rental increases on a straight-line basis, which is included in rents receivable. + References No definition available. + Details
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- Definition Future minimum rental payments in aggregate as of the balance sheet date under operating leases. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6454179&loc=d3e41551-112718 + Details
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- Definition Future rental payments receivable within one year of the balance sheet date under an operating lease. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6454179&loc=d3e41551-112718 + Details
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- Definition Amount of contingent rental revenue recognized for the period under lease, based on the occurrences of an event or condition. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6454179&loc=d3e41551-112718 + Details
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