Annual report pursuant to Section 13 and 15(d)

Consolidated Statements Of Changes In Stockholders' Equity

Consolidated Statements Of Changes In Stockholders' Equity (USD $)	Common Stock	Additional Paid-In Capital	Accumulated Deficit	Accumulated Other Comprehensive Income	Total
Beginning Balance, Amount at Dec. 31, 2012	$ 254,000	$ 58,046,000	$ (29,306,000)	$ (14,000)	$ 28,980,000us-gaap_StockholdersEquity
Beginning Balance, Shares at Dec. 31, 2012	25,392,269
Granting of options, Shares
Granting of options, Amount		390,000			390,000nssi_GrantingOfOptionsAmount
Shares and warrants issued in connection with patent acquisitions, Shares	403,226
Shares and warrants issued in connection with patent acquisitions, Amount	4,000	1,612,000			1,616,000
Proceeds from exercise of options and warrants, Shares	1,581,142
Proceeds from exercise of options and warrants, Amount	16,000	1,081,000			1,097,000
Value of shares delivered to fund withholding taxes and option exercise, Shares	(435,216)
Value of shares delivered to fund withholding taxes and option exercise, Amount	(4,000)		(777,000)		(781,000)
Treasury stock purchased and retired, Shares	(1,086,872)
Treasury stock purchased and retired, Amount	(11,000)		(1,486,000)		(1,497,000)
Unrealized gain on securities available-for-sale, Shares
Unrealized gain on securities available-for-sale, Amount				(17,000)	(17,000)
Net income			1,016,000		1,016,000us-gaap_NetIncomeLoss
Ending Balance, Amount at Dec. 31, 2013	259,000	61,129,000	(30,553,000)	(31,000)	30,804,000us-gaap_StockholdersEquity
Ending Balance, Shares at Dec. 31, 2013	25,854,549
Granting of options, Shares
Granting of options, Amount		333,000			333,000nssi_GrantingOfOptionsAmount
Proceeds from exercise of options and warrants, Shares	20,000
Proceeds from exercise of options and warrants, Amount		20,000			20,000
Value of shares delivered to fund withholding taxes and option exercise, Shares	(856,973)
Value of shares delivered to fund withholding taxes and option exercise, Amount	(9,000)		(1,021,000)		(1,030,000)
Treasury stock purchased and retired, Shares	(2,335,740)
Treasury stock purchased and retired, Amount	(23,000)		(4,454,000)		(4,477,000)
Unrealized gain on securities available-for-sale, Shares
Unrealized gain on securities available-for-sale, Amount				14,000	14,000
Cashless exercise of options, Shares	1,592,500
Cashless exercise of options, Amount	16,000				16,000nssi_CashlessExerciseOfOptionsAmount
Repurchase of warrants, Shares
Repurchase of warrants, Amount		(505,000)			(505,000)nssi_RepurchaseOfWarrantsAmount
Net income			1,766,000		1,766,000us-gaap_NetIncomeLoss
Ending Balance, Amount at Dec. 31, 2014	$ 243,000	$ 60,977,000	$ (34,262,000)	$ (17,000)	$ 26,941,000us-gaap_StockholdersEquity
Ending Balance, Shares at Dec. 31, 2014	24,274,336