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v3.22.2.2

DIVIDEND POLICY (Details Narrative) | 9 Months Ended
--- | ---
Sep. 30, 2022 $ / shares
Equity [Abstract] |
Dividends, per share - semi-annual | $ 0.05
Dividends, per share - annual | $ 0.10

X
- References No definition available. + Details
Name: | nssi_DividendsPerShare
Namespace Prefix: | nssi_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | nssi_DividendsPerShareAnnual
Namespace Prefix: | nssi_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_EquityAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration