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Preferred shares (Details) (CAD)
Dec. 31, 2014
Preferred Shares Details  
Preferred shares upon issue outstanding, Shares 10,000,000NSFDF_PreferredSharesUponIssueOutstandingShares
Preferred shares upon issue outstanding, Amount 3,489,000NSFDF_PreferredSharesUponIssueOutstandingAmount
Preferred shares upon issue convertible outstanding, Shares (2,000,000)NSFDF_PreferredSharesUponIssueConvertibleOutstandingShares
Preferred shares upon issue convertible outstanding, Amount (3,256,400)NSFDF_PreferredSharesUponIssueConvertibleOutstandingAmount
Total Preferred shares upon issue outstanding, Shares 8,000,000NSFDF_TotalPreferredSharesUponIssueOutstandingShares
Total Preferred shares upon issue outstanding, Amount 232,600NSFDF_TotalPreferredSharesUponIssueOutstandingAmount