Quarterly report pursuant to Section 13 or 15(d)

OTHER INVESTMENTS, AT COST (Details Narrative)

v2.4.1.9
OTHER INVESTMENTS, AT COST (Details Narrative) (USD $)
 3 Months Ended 1 Months Ended
Mar. 31, 2015
Sep. 30, 2013
Jul. 31, 2013
May 31, 2013
Dec. 31, 2014
Aug. 31, 2014
May 31, 2014
Jul. 31, 2014
Mar. 31, 2014
Non cash royalty income valued from warrants   $ 70,000us-gaap_RoyaltyIncomeNonoperating              
Aggregate investment in convertible secured notes 380,000us-gaap_OtherInvestmentsAndSecuritiesAtCost       576,000us-gaap_OtherInvestmentsAndSecuritiesAtCost        
Additional investment in various tranche         95,000us-gaap_InvestmentRelatedLiabilities 95,000us-gaap_InvestmentRelatedLiabilities 95,000us-gaap_InvestmentRelatedLiabilities    
Conversion price of senior outstanding preferred stock in percentage 80.00%nssi_ConversionPriceOfSeniorOutstandingPreferredStockInPercentage                
Minimum gross proceeds of qualified financing 3,000,000us-gaap_ProceedsFromNotesPayable                
The Company owns less than this percentage ownership of outstanding equity of Lifestreams 20.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired                
Lifestreams Technologies Corporation [Member]                  
Additional investment               50,000us-gaap_InvestmentOwnedAtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= nssi_LifestreamsTechnologiesCorporationMember 		 
Company received a warrant to purchase common stock shares     1,305,000nssi_CompanyReceivedWarrantToPurchaseCommonStockShares
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= nssi_LifestreamsTechnologiesCorporationMember 		           
Company participated in convertible secured notes                 2,000,000nssi_CompanyParticipatedInConvertibleSecuredNotes
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= nssi_LifestreamsTechnologiesCorporationMember
Aggregate investment in convertible secured notes                 380,000us-gaap_OtherInvestmentsAndSecuritiesAtCost
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= nssi_LifestreamsTechnologiesCorporationMember
Additional investment in various tranche                 $ 95,000us-gaap_InvestmentRelatedLiabilities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= nssi_LifestreamsTechnologiesCorporationMember
Mirror Worlds, LLC [Member]                  
Acquisition of common stock       250,000us-gaap_StockIssuedDuringPeriodSharesAcquisitions
/ us-gaap_StatementEquityComponentsAxis
= nssi_MirrorWorldsLlcMember 		         
Series A Preferred Stock [Member]                  
Shares received     123,456us-gaap_CommonStockDividendsShares
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_SeriesAPreferredStockMember