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Stockholders' Equity (Dividends) (Details) (USD $) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 23, 2012 | Dec. 31, 2014 | Dec. 31, 2013
Cash Dividends [Abstract] |  |  |
Cash dividends paid, net of reinvested stock dividends |  | $ 4,803,000 netr_CashDividendsPaidNetOfReinvestedStockDividends | $ 4,765,000 netr_CashDividendsPaidNetOfReinvestedStockDividends
Annualized dividend rate (in dollars per share) |  | $ 0.471 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.471 us-gaap_CommonStockDividendsPerShareCashPaid
Dividend Reinvestment Plan [Abstract] |  |  |
Registered shares of common stock pursuant to dividend reinvestment plan (in shares) | 1,500,000 netr_RegisteredSharesOfCommonStockPursuantToDividendReinvestmentPlan |  |
Percentage of purchase price per share (in hundredths) | 95.00%netr_PercentageOfPurchasePricePerShare |  |
Former sales price per share (in dollars per share) | $ 9.5 netr_SalesPricePerShareOfStock |  |
Notice period for amendments to Dividend Reinvesment Plan |  | 30 days |
Common stock issued under dividend reinvestment plan |  | 7,600,000 us-gaap_StockIssuedDuringPeriodValueDividendReinvestmentPlan |
Common stock issued under dividend reinvestment plan (in shares) |  | 836,000 us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan |
Redeemable Convertible Series 6.3% Preferred Stock [Member] |  |  |
Cash Dividends [Abstract] |  |  |
Cash dividends paid |  | $ 65,000 netr_CashDividendsPaidPreferredStock / us-gaap_StatementClassOfStockAxis = netr_RedeemableConvertibleSeries63PreferredStockMember | $ 105,000 netr_CashDividendsPaidPreferredStock / us-gaap_StatementClassOfStockAxis = netr_RedeemableConvertibleSeries63PreferredStockMember

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- Definition The period of notice for an amendment, suspension or termination to the Dividend Reinvestment Plan prior to a designated dividend record date. + References No definition available. + Details
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- Definition Aggregate dividends paid during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition Number of shares issued during the period from a dividend reinvestment plan (DRIP). A dividend reinvestment plan allows the shareholders to reinvest dividends paid to them by the entity on new issues of stock by the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
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