Annual report pursuant to Section 13 and 15(d)

STOCK REPURCHASE PROGRAM (Details Narrative)

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STOCK REPURCHASE PROGRAM (Details Narrative) (USD $)
12 Months Ended
Dec. 31, 2014
Jun. 03, 2014
Aug. 22, 2011
Stock Repurchase Details Narrative      
Additional dollar amount of Maximum shares for repurchase over the next 12 months (in dollars)   $ 5,000,000nssi_AdditionalDollerAmountOfMaximumSharesForRepurchaseOverNext12MonthsInDollars  
Total dollor amount of shares for repurchase since inception of repurchase program     12,000,000nssi_TotalDollorAmountOfSharesForRepurchase
Shares repurchased 2,335,740nssi_SharesRepurchased    
Shares repurchased-average price per share $ 1.90nssi_SharesRepurchasedaveragePricePerShare    
Dollar amount of stock repurchase $ 4,439,484nssi_DollarAmountOfStockRepurchase    
Shares repurchased since inception 5,749,068nssi_SharesRepurchasedSinceInception    
Shares repurchased since inception - average price per share $ 1.54nssi_SharesRepurchasedSinceInceptionAveragePricePerShare    
Dollar amount of shares repurchased since inception $ 8,872,107nssi_DollarAmountOfStockRepurchaseSinceInception