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Stockholders' Equity (Common and Preferred Stock) (Details) (USD $) | 1 Months Ended | 3 Months Ended |  |
--- | --- | --- | --- | ---
Oct. 31, 2006 | Mar. 31, 2015 | Mar. 31, 2010 | Dec. 31, 2014
Dubose Model Homes USA [Member] |  |  |  |
Common Stock [Abstract] |  |  |  |
Common stock shares issued (in shares) |  |  | 39,000 us-gaap_CommonStockSharesIssued / dei_LegalEntityAxis = netr_DuboseModelHomesUsaMember |
Private Placement [Member] |  |  |  |
Common Stock [Abstract] |  |  |  |
Sale of Stock, Number of Shares Issued in Transaction | 20,000,000 us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_PrivatePlacementMember |  |  |
Sale of Stock, Price Per Share | $ 10 us-gaap_SaleOfStockPricePerShare / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_PrivatePlacementMember |  |  |
Preferred Stock [Member] |  |  |  |
Preferred Stock [Abstract] |  |  |  |
Preferred shares authorized (in shares) |  | 8,900,000 us-gaap_PreferredStockSharesAuthorized / us-gaap_StatementClassOfStockAxis = us-gaap_PreferredStockMember |  |
Common Class A [Member] |  |  |  |
Common Stock [Abstract] |  |  |  |
Common stock, shares authorized (in shares) |  | 100,000,000 us-gaap_CommonStockSharesAuthorized / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  | 100,000,000 us-gaap_CommonStockSharesAuthorized / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember
Par value (in dollars per share) |  | $ 0.01 us-gaap_CommonStockParOrStatedValuePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  | $ 0.01 us-gaap_CommonStockParOrStatedValuePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember
Maximum individual common stock ownership (in hundredths) |  | 9.80%netr_MaximumIndividualCommonStockOwnership / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  |
Shares outstanding (in shares) |  | 16,941,250 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  | 16,887,377 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember
Common stock shares issued (in shares) |  | 16,941,250 us-gaap_CommonStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  | 16,887,377 us-gaap_CommonStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember
Common Class B [Member] |  |  |  |
Common Stock [Abstract] |  |  |  |
Common stock, shares authorized (in shares) |  | 1,000 us-gaap_CommonStockSharesAuthorized / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember |  |
Par value (in dollars per share) |  | $ 0.01 us-gaap_CommonStockParOrStatedValuePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember |  |
Maximum individual common stock ownership (in hundredths) |  | 9.80%netr_MaximumIndividualCommonStockOwnership / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember |  |

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