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Consolidated Statements of Stockholders' Equity (USD $)
Total
Common Stock [Member]
Additional Paid In Capital [Member]
Dividends In Excess of Accumulated Losses [Member]
Noncontrolling Interest [Member]
Parent [Member]
Beginning balance at Dec. 31, 2014 $ 60,733,884us-gaap_StockholdersEquity $ 168,874us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 $ 143,715,876us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		 $ (83,150,866)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDistributionsInExcessOfNetIncomeMember		 $ 10,802,449us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember		 $ 71,536,333us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
Beginning balance (in shares) at Dec. 31, 2014   16,887,377us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		        
Net (loss) income (1,962,038)us-gaap_IncomeLossFromContinuingOperations 0us-gaap_IncomeLossFromContinuingOperations
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 0us-gaap_IncomeLossFromContinuingOperations
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		 (1,962,038)us-gaap_IncomeLossFromContinuingOperations
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDistributionsInExcessOfNetIncomeMember		 132,513us-gaap_IncomeLossFromContinuingOperations
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember		 (1,829,525)us-gaap_IncomeLossFromContinuingOperations
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
Dividends paid/reinvested (in shares)   72,710us-gaap_CommonStockDividendsShares
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		        
Dividends declared/reinvested, value (1,006,535)us-gaap_DividendsCommonStockStock 727us-gaap_DividendsCommonStockStock
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 697,061us-gaap_DividendsCommonStockStock
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		 (1,704,323)us-gaap_DividendsCommonStockStock
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDistributionsInExcessOfNetIncomeMember		 0us-gaap_DividendsCommonStockStock
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember		 (1,006,535)us-gaap_DividendsCommonStockStock
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
Common stock issued, shares   2,163us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		        
Common stock issued, value 49,999us-gaap_StockIssuedDuringPeriodValueNewIssues 22us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 49,977us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		 0us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDistributionsInExcessOfNetIncomeMember		 0us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember		 49,999us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
Common stock repurchased - related parties (in shares)   (21,000)netr_StockRepurchasedRelatedPartyDuringPeriodShares
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		        
Common stock repurchased - related parties (147,774)netr_StockRepurchasedRelatedPartyDuringPeriodValue (210)netr_StockRepurchasedRelatedPartyDuringPeriodValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 (147,564)netr_StockRepurchasedRelatedPartyDuringPeriodValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		 0netr_StockRepurchasedRelatedPartyDuringPeriodValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDistributionsInExcessOfNetIncomeMember		 0netr_StockRepurchasedRelatedPartyDuringPeriodValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember		 (147,774)netr_StockRepurchasedRelatedPartyDuringPeriodValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
Contributions from noncontrolling interests net of distributions paid 0netr_ContributedCapitalLessDistributionsOfNoncontrollingInterests 0netr_ContributedCapitalLessDistributionsOfNoncontrollingInterests
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 0netr_ContributedCapitalLessDistributionsOfNoncontrollingInterests
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		 0netr_ContributedCapitalLessDistributionsOfNoncontrollingInterests
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDistributionsInExcessOfNetIncomeMember		 662,192netr_ContributedCapitalLessDistributionsOfNoncontrollingInterests
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember		 662,192netr_ContributedCapitalLessDistributionsOfNoncontrollingInterests
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
Ending balance at Mar. 31, 2015 $ 57,667,536us-gaap_StockholdersEquity $ 169,413us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 $ 144,315,350us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		 $ (86,817,227)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDistributionsInExcessOfNetIncomeMember		 $ 11,597,154us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember		 $ 69,264,690us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember
Ending balance (in shares) at Mar. 31, 2015   16,941,250us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember