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v2.4.1.9

TAXABLE INCOME AND TAX BASIS (Details) (USD $) | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
TAXABLE INCOME AND TAX BASIS |  |  |  |  |  |  |  |  |  |  |
Book/Tax differences on tax free exchanges |  |  |  |  |  |  |  |  | $ (827,000)nen_ReconciliationOfIncomeFromBookBasisToTaxBasisTaxFreeExchanges | $ (4,670,000)nen_ReconciliationOfIncomeFromBookBasisToTaxBasisTaxFreeExchanges | $ 266,000 nen_ReconciliationOfIncomeFromBookBasisToTaxBasisTaxFreeExchanges
Book/Tax differences from depreciation and amortization |  |  |  |  |  |  |  |  | 2,884,000 nen_ReconciliationOfIncomeFromBookBasisToTaxBasisDepreciationAndAmortization | 300,000 nen_ReconciliationOfIncomeFromBookBasisToTaxBasisDepreciationAndAmortization | (51,000)nen_ReconciliationOfIncomeFromBookBasisToTaxBasisDepreciationAndAmortization
Excess amount of cumulative statement basis over cumulative taxable basis | 5,000,000 nen_IncomeTaxExcessOfRealEstateStatementBasisOverRealEstateIncomeTaxBasis |  |  |  |  |  |  |  | 5,000,000 nen_IncomeTaxExcessOfRealEstateStatementBasisOverRealEstateIncomeTaxBasis |  |
Excess amount of statement income from joint venture investments over taxable income |  |  |  |  |  |  |  |  | 1,300,000 nen_IncomeTaxExcessOfInvestmentsStatementBasisOverInvestmentsTaxableBasis |  |
Reconciliation of GAAP net income to taxable income |  |  |  |  |  |  |  |  |  |  |
Financial statement ("book") net income | 591,256 us-gaap_NetIncomeLoss | 181,487 us-gaap_NetIncomeLoss | 281,721 us-gaap_NetIncomeLoss | (29,614)us-gaap_NetIncomeLoss | 317,518 us-gaap_NetIncomeLoss | (32,874)us-gaap_NetIncomeLoss | 4,469,116 us-gaap_NetIncomeLoss | 901,625 us-gaap_NetIncomeLoss | 1,024,850 us-gaap_NetIncomeLoss | 5,655,385 us-gaap_NetIncomeLoss | 3,633,798 us-gaap_NetIncomeLoss
Book/Tax differences from depreciation and amortization |  |  |  |  |  |  |  |  | (2,884,000)nen_ReconciliationOfIncomeFromBookBasisToTaxBasisDepreciationAndAmortization | (300,000)nen_ReconciliationOfIncomeFromBookBasisToTaxBasisDepreciationAndAmortization | 51,000 nen_ReconciliationOfIncomeFromBookBasisToTaxBasisDepreciationAndAmortization
Book/Tax differences on tax free exchanges |  |  |  |  |  |  |  |  | (827,000)nen_ReconciliationOfIncomeFromBookBasisToTaxBasisTaxFreeExchanges | (4,670,000)nen_ReconciliationOfIncomeFromBookBasisToTaxBasisTaxFreeExchanges | 266,000 nen_ReconciliationOfIncomeFromBookBasisToTaxBasisTaxFreeExchanges
Book/Tax differences from Investment Properties |  |  |  |  |  |  |  |  | 307,000 nen_ReconciliationOfIncomeFromBookBasisToTaxBasisInvestmentProperties | 400,000 nen_ReconciliationOfIncomeFromBookBasisToTaxBasisInvestmentProperties | 198,000 nen_ReconciliationOfIncomeFromBookBasisToTaxBasisInvestmentProperties
Increase (Decrease) in prepaid rent and allowances |  |  |  |  |  |  |  |  | 269,000 nen_ReconciliationOfIncomeFromBookBasisToTaxBasisPrepaidRentAndAllowances | 175,000 nen_ReconciliationOfIncomeFromBookBasisToTaxBasisPrepaidRentAndAllowances | (40,000)nen_ReconciliationOfIncomeFromBookBasisToTaxBasisPrepaidRentAndAllowances
Other |  |  |  |  |  |  |  |  | 2,000 nen_ReconciliationOfIncomeFromBookBasisToTaxBasisOtherAdjustments | 50,000 nen_ReconciliationOfIncomeFromBookBasisToTaxBasisOtherAdjustments | 57,000 nen_ReconciliationOfIncomeFromBookBasisToTaxBasisOtherAdjustments
Taxable income (loss) |  |  |  |  |  |  |  |  | $ (2,108,000)nen_ReconciliationOfIncomeFromBookBasisToTaxBasisProfitLossTaxBasis | $ 1,310,000 nen_ReconciliationOfIncomeFromBookBasisToTaxBasisProfitLossTaxBasis | $ 4,166,000 nen_ReconciliationOfIncomeFromBookBasisToTaxBasisProfitLossTaxBasis

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