Stock-based Compensation Plans (Details 2) - $ / shares |
3 Months Ended | |
|---|---|---|
May 31, 2018 |
May 31, 2017 |
|
| Stock-based Compensation Plans | ||
| Exercise price | $ 5.25 | |
| Risk-free interest rate | 2.02% | |
| Expected dividend yield | 0.00% | |
| Expected volatility | 110.72% | |
| Expected life years | 6 years | |