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Segments (Assets) (Details) (USD $) | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
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Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |  |
Land, buildings and improvements, net | $ 198,197,703 us-gaap_RealEstateInvestmentPropertyNet |  | $ 160,231,124 us-gaap_RealEstateInvestmentPropertyNet |  |
Cash and cash equivalents | 5,636,002 us-gaap_CashAndCashEquivalentsAtCarryingValue |  | 10,207,001 us-gaap_CashAndCashEquivalentsAtCarryingValue |  | 10,746,536 us-gaap_CashAndCashEquivalentsAtCarryingValue
Other assets, net | 7,200,512 us-gaap_OtherAssets |  | 5,155,669 us-gaap_OtherAssets |  |
TOTAL ASSETS | 220,624,938 us-gaap_Assets |  | 182,021,344 us-gaap_Assets |  |
Significant Reconciling Items [Member] |  |  |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |  |
Land, buildings and improvements, net | 208,489,740 us-gaap_RealEstateInvestmentPropertyNet / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember |  | 170,405,956 us-gaap_RealEstateInvestmentPropertyNet / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember |  |
Cash and cash equivalents | 5,636,002 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember |  | 10,207,001 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember |  |
Other assets, net | 6,499,196 us-gaap_OtherAssets / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember |  | 1,408,387 us-gaap_OtherAssets / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember |  |
TOTAL ASSETS | 220,624,938 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember |  | 182,021,344 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember |  |
Industrial Office Properties [Member] |  |  |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |  |
Land, buildings and improvements, net | 122,351,316 us-gaap_RealEstateInvestmentPropertyNet / us-gaap_StatementBusinessSegmentsAxis = netr_IndustrialOfficePropertiesMember | [1] | 85,234,171 us-gaap_RealEstateInvestmentPropertyNet / us-gaap_StatementBusinessSegmentsAxis = netr_IndustrialOfficePropertiesMember | [1] |
TOTAL ASSETS | 130,185,089 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = netr_IndustrialOfficePropertiesMember | [2] | 90,589,726 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = netr_IndustrialOfficePropertiesMember | [2] |
Residential Properties [Member] |  |  |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |  |
Land, buildings and improvements, net | 13,133,827 us-gaap_RealEstateInvestmentPropertyNet / us-gaap_StatementBusinessSegmentsAxis = netr_ResidentialPropertiesMember | [1] | 23,093,296 us-gaap_RealEstateInvestmentPropertyNet / us-gaap_StatementBusinessSegmentsAxis = netr_ResidentialPropertiesMember | [1] |
TOTAL ASSETS | 13,588,922 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = netr_ResidentialPropertiesMember | [2] | 25,434,100 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = netr_ResidentialPropertiesMember | [2] |
Retail Properties [Member] |  |  |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |  |
Land, buildings and improvements, net | 33,141,294 us-gaap_RealEstateInvestmentPropertyNet / us-gaap_StatementBusinessSegmentsAxis = netr_RetailPropertiesMember | [1] | 21,931,330 us-gaap_RealEstateInvestmentPropertyNet / us-gaap_StatementBusinessSegmentsAxis = netr_RetailPropertiesMember | [1] |
TOTAL ASSETS | 34,712,223 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = netr_RetailPropertiesMember | [2] | 23,354,122 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = netr_RetailPropertiesMember | [2] |
Self Storage Properties [Member] |  |  |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |  |
Land, buildings and improvements, net | 29,107,675 us-gaap_RealEstateInvestmentPropertyNet / us-gaap_StatementBusinessSegmentsAxis = netr_SelfStoragePropertiesMember | [1] | 121,390,988 us-gaap_RealEstateInvestmentPropertyNet / us-gaap_StatementBusinessSegmentsAxis = netr_SelfStoragePropertiesMember | [1] |
TOTAL ASSETS | $ 30,003,506 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = netr_SelfStoragePropertiesMember | [2] | $ 31,028,008 us-gaap_Assets / 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 and other related intangible assets, all shown on a net basis.

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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.18) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 18 -Article 5 + Details
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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3044-108585 + Details
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- Definition Amount of real estate investment property, net of accumulated depreciation, which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(d)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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