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Stock options (Details Narrative)	Dec. 31, 2018 USD ($)
Stock Options Details Narrative
Unamortized non-vested portion of stock options	$ 28,000

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Namespace Prefix:	NSFDF_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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Namespace Prefix:	NSFDF_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant