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Segments (Capital Expenditures) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Reconciliation of Other Significant Reconciling Items from Segments to Consolidated [Abstract]
Acquisition of operating properties	$ 59,275,783us-gaap_PaymentsToAcquireRealEstate	$ 7,839,389us-gaap_PaymentsToAcquireRealEstate
Capital expenditures and tenant improvements	2,567,027us-gaap_PaymentsForTenantImprovements	2,857,010us-gaap_PaymentsForTenantImprovements
Total real estate investments	61,842,810netr_RealEstateAcquisitions	10,696,399netr_RealEstateAcquisitions
Industrial Office Properties [Member]
Reconciliation of Other Significant Reconciling Items from Segments to Consolidated [Abstract]
Acquisition of operating properties	42,337,414us-gaap_PaymentsToAcquireRealEstate / us-gaap_StatementBusinessSegmentsAxis = netr_IndustrialOfficePropertiesMember	0us-gaap_PaymentsToAcquireRealEstate / us-gaap_StatementBusinessSegmentsAxis = netr_IndustrialOfficePropertiesMember
Capital expenditures and tenant improvements	2,123,438us-gaap_PaymentsForTenantImprovements / us-gaap_StatementBusinessSegmentsAxis = netr_IndustrialOfficePropertiesMember	2,758,787us-gaap_PaymentsForTenantImprovements / us-gaap_StatementBusinessSegmentsAxis = netr_IndustrialOfficePropertiesMember
Residential Properties [Member]
Reconciliation of Other Significant Reconciling Items from Segments to Consolidated [Abstract]
Acquisition of operating properties	5,726,700us-gaap_PaymentsToAcquireRealEstate / us-gaap_StatementBusinessSegmentsAxis = netr_ResidentialPropertiesMember	4,189,389us-gaap_PaymentsToAcquireRealEstate / us-gaap_StatementBusinessSegmentsAxis = netr_ResidentialPropertiesMember
Retail Properties [Member]
Reconciliation of Other Significant Reconciling Items from Segments to Consolidated [Abstract]
Acquisition of operating properties	11,211,669us-gaap_PaymentsToAcquireRealEstate / us-gaap_StatementBusinessSegmentsAxis = netr_RetailPropertiesMember	3,650,000us-gaap_PaymentsToAcquireRealEstate / us-gaap_StatementBusinessSegmentsAxis = netr_RetailPropertiesMember
Capital expenditures and tenant improvements	359,473us-gaap_PaymentsForTenantImprovements / us-gaap_StatementBusinessSegmentsAxis = netr_RetailPropertiesMember	70,235us-gaap_PaymentsForTenantImprovements / us-gaap_StatementBusinessSegmentsAxis = netr_RetailPropertiesMember
Self Storage Properties [Member]
Reconciliation of Other Significant Reconciling Items from Segments to Consolidated [Abstract]
Capital expenditures and tenant improvements	$ 84,116us-gaap_PaymentsForTenantImprovements / us-gaap_StatementBusinessSegmentsAxis = netr_SelfStoragePropertiesMember	$ 27,988us-gaap_PaymentsForTenantImprovements / us-gaap_StatementBusinessSegmentsAxis = netr_SelfStoragePropertiesMember

X

- Definition

The total of additions to real estate and lease intangibles

+ References

No definition available.

+ Details

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X

- Definition

Amount of cash outflow for the allowance granted to lessee and/or direct costs incurred by lessor used to prepare the leased premises for tenant's occupancy.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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X

- Definition

The cash outflow from the acquisition of a piece of land, anything permanently fixed to it, including buildings, structures on it and so forth; includes real estate intended to generate income for the owner; excludes real estate acquired for use by the owner.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 13

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585

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- Details

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X

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