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CASH AND CASH EQUIVALENTS (Details Narrative)	Mar. 31, 2016 USD ($)
Cash And Cash Equivalents Details Narrative
Maintained cash balance in excess of FDIC	$ 20,088,000

X

- References

No definition available.

+ Details

Name:	nssi_CashAndCashEquivalentsDetailsNarrativeAbstract
Namespace Prefix:	nssi_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of cash as of the balance sheet date that is not insured by the Federal Deposit Insurance Corporation.

+ References

No definition available.

+ Details

Name:	us-gaap_CashUninsuredAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant