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Accounts payable and accrued liabilities (Details) (CAD)
Dec. 31, 2014
Dec. 31, 2013
Gross Accrued liabilities 298,440us-gaap_AccruedLiabilitiesCurrentAndNoncurrent 220,831us-gaap_AccruedLiabilitiesCurrentAndNoncurrent
Trade payables, payroll withholdings and other 484,186us-gaap_AccruedLiabilitiesCurrent 718,524us-gaap_AccruedLiabilitiesCurrent
Accrued liabilities Current 782,626NSFDF_AccruedLiabilitiesNonCurrent 939,355NSFDF_AccruedLiabilitiesNonCurrent
Consultants and professional fees    
Gross Accrued liabilities 122,500us-gaap_AccruedLiabilitiesCurrentAndNoncurrent
/ NSFDF_ComponentOfOtherOperatingCostAndExpenseAxis
= NSFDF_ConsultantsAndProfessionalFeesMember		 105,000us-gaap_AccruedLiabilitiesCurrentAndNoncurrent
/ NSFDF_ComponentOfOtherOperatingCostAndExpenseAxis
= NSFDF_ConsultantsAndProfessionalFeesMember
Board of Directors' fees    
Gross Accrued liabilities 40,000us-gaap_AccruedLiabilitiesCurrentAndNoncurrent
/ NSFDF_ComponentOfOtherOperatingCostAndExpenseAxis
= NSFDF_BoardOfDirectorsFeesMember		   
Survey and other projects    
Gross Accrued liabilities 14,308us-gaap_AccruedLiabilitiesCurrentAndNoncurrent
/ NSFDF_ComponentOfOtherOperatingCostAndExpenseAxis
= NSFDF_SurveyExpensesMember		   
Vacation pay, wages and bonuses payable    
Gross Accrued liabilities 121,632us-gaap_AccruedLiabilitiesCurrentAndNoncurrent
/ NSFDF_ComponentOfOtherOperatingCostAndExpenseAxis
= NSFDF_WagesAndBonusesPayableMember		 115,831us-gaap_AccruedLiabilitiesCurrentAndNoncurrent
/ NSFDF_ComponentOfOtherOperatingCostAndExpenseAxis
= NSFDF_WagesAndBonusesPayableMember