Stock-based Compensation Plans (Details) - $ / shares |
3 Months Ended | |
|---|---|---|
May 31, 2018 |
May 31, 2017 |
|
| Number of Warrant Shares | ||
| Outstanding, beginning of period | 2,515,248 | 1,647,670 |
| Granted | 550,000 | |
| Exercised | (20,000) | (22,548) |
| Forfeited | (100,000) | |
| Expired | (314,667) | |
| Outstanding, end of period | 2,395,248 | 1,860,455 |
| Exercisable, end of period | 1,066,916 | 836,705 |
| Weighted Average Exercise Price | ||
| Outstanding, beginning of period | $ 8.21 | $ 2.91 |
| Granted | 5.25 | |
| Exercised | 0.80 | 0.80 |
| Forfeited | 5.25 | |
| Expired | 6.00 | |
| Outstanding, end of period | 8.40 | 3.11 |
| Exercisable, end of period | $ 7.32 | $ 2.82 |