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OTHER INVESTMENTS AT COST (Details) (USD $)
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Mar. 31, 2015
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| Total other investments at cost, Carrying value | $ 380,000us-gaap_Investments |
| Common Stock [Member] | |
| Investment at cost, Number of shares |
250,000us-gaap_InvestmentOwnedBalanceShares / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |
| Total other investments at cost, Carrying value |
76,000us-gaap_Investments / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |
| Series A Preferred Stock [Member] | |
| Investment at cost, Number of shares |
123,456us-gaap_InvestmentOwnedBalanceShares / us-gaap_StatementEquityComponentsAxis = us-gaap_SeriesAPreferredStockMember |
| Total other investments at cost, Carrying value |
50,000us-gaap_Investments / us-gaap_StatementEquityComponentsAxis = us-gaap_SeriesAPreferredStockMember |
| Warrant [Member] | |
| Investment at cost, Number of shares |
1,305,000us-gaap_InvestmentOwnedBalanceShares / us-gaap_StatementEquityComponentsAxis = us-gaap_WarrantMember |
| Total other investments at cost, Carrying value |
70,000us-gaap_Investments / us-gaap_StatementEquityComponentsAxis = us-gaap_WarrantMember |
| Convertible Secured Notes [Member] | |
| Investment at cost, Number of shares | |
| Total other investments at cost, Carrying value |
$ 380,000us-gaap_Investments / us-gaap_StatementEquityComponentsAxis = nssi_ConvertibleSecuredNotesMember |
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- Definition
Balance held at close of period in number of shares. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Sum of the carrying amounts as of the balance sheet date of all investments. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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