Note 9 - Share-based Compensation (Details Textual) | Dec. 01, 2015USD ($)shares | Feb. 28, 2017CAD / shares | Feb. 28, 2017USD ($)$ / sharesshares | Feb. 29, 2016CAD / sharesshares |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | | | | 4,586,700 |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | CAD / shares | | | | CAD 5.02 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value | CAD / shares | | | | CAD 1.83 |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term | | | 3 years | 3 years |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate | | | 50.00% | 54.00% |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate | | | 1.35% | 0.50% |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Forfeiture Rate | | | 2.50% | 3.00% |
CANADA | | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate | | | 0.57% | |
Employee Stock Options 1 [Member] | | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | | | 2,923,300 | |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | $ / shares | | | $ 4.58 | |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares | | | $ 1.60 | |
Employee Stock Options 2 [Member] | | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | | | 621,600 | |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | CAD / shares | | CAD 6.16 | | |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value | CAD / shares | | 2.10 | | |
Performance Share Units [Member] | | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | | | 940,500 | 1,241,900 |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | CAD / shares | | CAD 6.58 | | CAD 4.65 |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Common Shares Per Award, Adjusted, Multiplier | 140.00% | 113.00% | 113.00% | |
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures | 1,377,364 | | | |
Payments Related to Tax Withholding for Share-based Compensation | $ | $ 4,275,000 | | $ 196,000 | |
Performance Share Units [Member] | Executive Officer [Member] | | | | |
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures | | | 1,449,506 | |
Performance Share Units [Member] | Other Employees [Member] | | | | |
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures | | | 63,961 | |