Quarterly report pursuant to Section 13 or 15(d)

OTHER INVESTMENTS AT COST (Details)

v2.4.1.9
OTHER INVESTMENTS AT COST (Details) (USD $)
Mar. 31, 2015
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