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Consolidated Statements of Shareholders' Equity (CAD)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Common Shares      
Balance at beginning of the year 61,340,321NSFDF_BalanceAtBeginningOfYears 56,623,686NSFDF_BalanceAtBeginningOfYears 53,756,687NSFDF_BalanceAtBeginningOfYears
Issued through private placement financings, net of issue costs [note 7]       2,886,024NSFDF_IssuedThroughPrivatePlacementNetOfIssueCosts
Value attributed to US$ Warrants issued in private placement financings [note 7 and 12]       (409,143)NSFDF_ValueAttributedToDerivativeInstrumentsRelatedToWarrantsIssuedInPrivatePlacementFinancingsNote8And12
Issued upon exercise of US$ Warrants [note 11] 2,735,995NSFDF_IssuedUponExerciseOfWarrants 1,064,222NSFDF_IssuedUponExerciseOfWarrants   
Issued upon exercise of common share purchase warrants       278,760NSFDF_IssuedUponExerciseOfCommonSharePurchaseWarrants1
Issued upon exercise of stock options 288,066NSFDF_IssuedUponExerciseOfStockOptions 13,234NSFDF_IssuedUponExerciseOfStockOptions 47,250NSFDF_IssuedUponExerciseOfStockOptions
Transfer from contributed capital upon exercise of stock options 147,125NSFDF_TransferFromContributedCapitalUponExerciseOfStockOptions1 8,279NSFDF_TransferFromContributedCapitalUponExerciseOfStockOptions1 18,375NSFDF_TransferFromContributedCapitalUponExerciseOfStockOptions1
Transfer from contributed capital upon exercise of common share purchase warrants       45,733NSFDF_TransferFromContributedCapitalUponExerciseOfStockOptionsAndWarrants
Transfer from fair value of US$ Warrants upon exercise of US$ Warrants [note 12] 1,280,800NSFDF_TransferFromFairValueOfUSWarrantsUponExerciseOfWarrants 374,500NSFDF_TransferFromFairValueOfUSWarrantsUponExerciseOfWarrants   
Issued on conversion of preferred shares [notes 7 and 8]    3,256,400NSFDF_IssuedOnConversionOfPreferredShares   
Balance at end of the year 65,792,307NSFDF_BalanceAtEndOfYear 61,340,321NSFDF_BalanceAtEndOfYear 56,623,686NSFDF_BalanceAtEndOfYear
Preferred Shares      
Balance at beginning of the year 232,600NSFDF_BalanceAtBeginningAndEndOfYear 3,489,000NSFDF_BalanceAtBeginningAndEndOfYear 3,489,000NSFDF_BalanceAtBeginningAndEndOfYear
Conversion of preferred shares to common shares [notes 7 and 8]    (3,256,400)NSFDF_ConversionOfPreferredSharesToCommonShares   
Balance at end of the year 232,600NSFDF_BalanceAtEndOfYear3 232,600NSFDF_BalanceAtEndOfYear3 3,489,000NSFDF_BalanceAtEndOfYear3
Contributed Capital      
Balance at beginning of the year 5,889,914NSFDF_BalanceAtBeginningOfYear 5,406,193NSFDF_BalanceAtBeginningOfYear 5,205,301NSFDF_BalanceAtBeginningOfYear
Recognition of stock based compensation expense 658,000NSFDF_RecognitionOfStockBasedCompensationExpense 492,000NSFDF_RecognitionOfStockBasedCompensationExpense 265,000NSFDF_RecognitionOfStockBasedCompensationExpense
Contributed capital transferred to common shares pursuant to exercise of stock options and common share purchase warrants (147,125)NSFDF_ContributedCapitalTransferredToCommonSharesPursuantToExerciseOfOptionsAndWarrants (8,279)NSFDF_ContributedCapitalTransferredToCommonSharesPursuantToExerciseOfOptionsAndWarrants (64,108)NSFDF_ContributedCapitalTransferredToCommonSharesPursuantToExerciseOfOptionsAndWarrants
Balance at end of the year 6,400,789NSFDF_BalanceAtEndOfYear1 5,889,914NSFDF_BalanceAtEndOfYear1 5,406,193NSFDF_BalanceAtEndOfYear1
Deficit      
Balance at beginning of the year (66,356,793)NSFDF_BalanceAtBeginningOfYear1 (61,015,232)NSFDF_BalanceAtBeginningOfYear1 (63,077,960)NSFDF_BalanceAtBeginningOfYear1
Net income (loss) and comprehensive income (loss) for the year (1,563,361)NSFDF_NetLossAndComprehensiveLossForYear (5,341,561)NSFDF_NetLossAndComprehensiveLossForYear 2,062,728NSFDF_NetLossAndComprehensiveLossForYear
Balance at end of the year (67,920,154)NSFDF_BalanceAtEndOfYear2 (66,356,793)NSFDF_BalanceAtEndOfYear2 (61,015,232)NSFDF_BalanceAtEndOfYear2
Accumulated Other Comprehensive Income      
Balance at beginning and end of the year 710,935NSFDF_BalanceAtBeginningAndEndOfYear1 710,935NSFDF_BalanceAtBeginningAndEndOfYear1 710,935NSFDF_BalanceAtBeginningAndEndOfYear1
Total Shareholders' Equity at end of the year 5,216,477NSFDF_TotalShareholdersEquityAtEndOfYear 1,816,977NSFDF_TotalShareholdersEquityAtEndOfYear 5,214,582NSFDF_TotalShareholdersEquityAtEndOfYear