Stock-based Compensation Plans (Details) - $ / shares |
6 Months Ended | |
|---|---|---|
Aug. 31, 2018 |
Aug. 31, 2017 |
|
| Number of Warrant Shares | ||
| Outstanding, beginning of period | 2,515,248 | 1,647,670 |
| Granted | 13,209 | 1,080,000 |
| Exercised | (20,000) | (213,770) |
| Forfeited | (100,000) | (65,418) |
| Expired | (62,500) | (443,900) |
| Outstanding, end of period | 2,345,957 | 2,004,582 |
| Exercisable, end of period | 1,071,915 | 616,457 |
| Weighted Average Exercise Price | ||
| Outstanding, beginning of period | $ 8.21 | $ 2.91 |
| Granted | 11.52 | 5.25 |
| Exercised | 0.80 | 5.52 |
| Forfeited | 5.25 | 2.90 |
| Expired | 4.80 | 6.00 |
| Outstanding, end of period | 8.44 | 3.21 |
| Exercisable, end of period | $ 7.67 | $ 1.19 |