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Segments (Assets) (Details) (USD $)
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Dec. 31, 2013
Segment Reporting, Asset Reconciling Item [Line Items]        
Land, buildings and improvements, net $ 171,686,807us-gaap_RealEstateInvestmentPropertyNet $ 169,090,028us-gaap_RealEstateInvestmentPropertyNet    
Cash and cash equivalents 4,475,600us-gaap_CashAndCashEquivalentsAtCarryingValue 5,636,002us-gaap_CashAndCashEquivalentsAtCarryingValue 7,233,620us-gaap_CashAndCashEquivalentsAtCarryingValue 10,207,001us-gaap_CashAndCashEquivalentsAtCarryingValue
Other assets, net 5,194,696us-gaap_OtherAssets 4,842,878us-gaap_OtherAssets    
TOTAL ASSETS 223,141,361us-gaap_Assets 220,624,938us-gaap_Assets    
Significant Reconciling Items [Member]        
Segment Reporting, Asset Reconciling Item [Line Items]        
Land, buildings and improvements, net 210,574,266us-gaap_RealEstateInvestmentPropertyNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_MaterialReconcilingItemsMember		 208,489,740us-gaap_RealEstateInvestmentPropertyNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_MaterialReconcilingItemsMember		    
Cash and cash equivalents 4,475,600us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_ConsolidationItemsAxis
= us-gaap_MaterialReconcilingItemsMember		 5,636,002us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_ConsolidationItemsAxis
= us-gaap_MaterialReconcilingItemsMember		    
Other assets, net 8,091,495us-gaap_OtherAssets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_MaterialReconcilingItemsMember		 6,499,196us-gaap_OtherAssets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_MaterialReconcilingItemsMember		    
TOTAL ASSETS 223,141,361us-gaap_Assets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_MaterialReconcilingItemsMember		 220,624,938us-gaap_Assets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_MaterialReconcilingItemsMember		    
Industrial Office Properties [Member] | Significant Reconciling Items [Member]        
Segment Reporting, Asset Reconciling Item [Line Items]        
Land, buildings and improvements, net 121,138,911us-gaap_RealEstateInvestmentPropertyNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_MaterialReconcilingItemsMember
/ us-gaap_StatementBusinessSegmentsAxis
= netr_IndustrialOfficePropertiesMember		 [1] 122,351,316us-gaap_RealEstateInvestmentPropertyNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_MaterialReconcilingItemsMember
/ us-gaap_StatementBusinessSegmentsAxis
= netr_IndustrialOfficePropertiesMember		 [1]    
TOTAL ASSETS 130,059,818us-gaap_Assets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_MaterialReconcilingItemsMember
/ us-gaap_StatementBusinessSegmentsAxis
= netr_IndustrialOfficePropertiesMember		 [2] 130,185,089us-gaap_Assets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_MaterialReconcilingItemsMember
/ us-gaap_StatementBusinessSegmentsAxis
= netr_IndustrialOfficePropertiesMember		 [2]    
Residential Properties [Member] | Significant Reconciling Items [Member]        
Segment Reporting, Asset Reconciling Item [Line Items]        
Land, buildings and improvements, net 12,603,823us-gaap_RealEstateInvestmentPropertyNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_MaterialReconcilingItemsMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_ResidentialRealEstateMember		 [1] 13,133,827us-gaap_RealEstateInvestmentPropertyNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_MaterialReconcilingItemsMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_ResidentialRealEstateMember		 [1]    
TOTAL ASSETS 13,810,493us-gaap_Assets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_MaterialReconcilingItemsMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_ResidentialRealEstateMember		 [2] 13,588,922us-gaap_Assets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_MaterialReconcilingItemsMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_ResidentialRealEstateMember		 [2]    
Retail Properties [Member] | Significant Reconciling Items [Member]        
Segment Reporting, Asset Reconciling Item [Line Items]        
Land, buildings and improvements, net 33,766,924us-gaap_RealEstateInvestmentPropertyNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_MaterialReconcilingItemsMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_RetailSiteMember		 [1] 33,141,294us-gaap_RealEstateInvestmentPropertyNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_MaterialReconcilingItemsMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_RetailSiteMember		 [1]    
TOTAL ASSETS 36,805,479us-gaap_Assets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_MaterialReconcilingItemsMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_RetailSiteMember		 [2] 34,712,223us-gaap_Assets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_MaterialReconcilingItemsMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_RetailSiteMember		 [2]    
Self Storage Properties [Member] | Significant Reconciling Items [Member]        
Segment Reporting, Asset Reconciling Item [Line Items]        
Land, buildings and improvements, net 28,929,279us-gaap_RealEstateInvestmentPropertyNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_MaterialReconcilingItemsMember
/ us-gaap_StatementBusinessSegmentsAxis
= netr_SelfStoragePropertiesMember		 [1] 29,107,675us-gaap_RealEstateInvestmentPropertyNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_MaterialReconcilingItemsMember
/ us-gaap_StatementBusinessSegmentsAxis
= netr_SelfStoragePropertiesMember		 [1]    
TOTAL ASSETS $ 29,898,476us-gaap_Assets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_MaterialReconcilingItemsMember
/ us-gaap_StatementBusinessSegmentsAxis
= netr_SelfStoragePropertiesMember		 [2] $ 30,003,506us-gaap_Assets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_MaterialReconcilingItemsMember
/ us-gaap_StatementBusinessSegmentsAxis
= netr_SelfStoragePropertiesMember		 [2]    
[1]
Includes lease intangibles and the land purchase option related to property acquisitions.
[2]
Includes land, buildings and improvements, current receivables, deferred rent receivables and deferred leasing costs