Quarterly report pursuant to Section 13 or 15(d)

MARKETABLE SECURITIES (Details Narrative)

v2.4.1.9
MARKETABLE SECURITIES (Details Narrative) (USD $)
3 Months Ended
Mar. 31, 2015
Corporate bonds face value, 3.9% - 4.5% coupon $ 1,000,000us-gaap_FinancialInstrumentsOwnedCorporateEquitiesAtFairValue
Maturity date of marketable securities 2021
Corporate Bond 1 [Member]  
Corporate bond coupon 3.90%nssi_CorporateBondCoupon
/ us-gaap_StatementEquityComponentsAxis
= nssi_CorporateBondOneMember
Corporate Bond 2 [Member]  
Corporate bond coupon 4.50%nssi_CorporateBondCoupon
/ us-gaap_StatementEquityComponentsAxis
= nssi_CorporateBondTwoMember