Stock Option Plan and Stock Based Compensation - Restricted Stock Grant Activity (Detail) - Restricted Stock [Member] |
3 Months Ended |
|---|---|
|
May 31, 2016
$ / shares
shares
| |
| Restricted stock grant activity | |
| Outstanding at Beginning, Number of Shares | shares | 189,396 |
| Number of Shares, Granted | shares | 64,685 |
| Number of Shares, Terminated | shares | 0 |
| Number of Shares, Vested | shares | (89,535) |
| Outstanding at Ending, Number of Shares | shares | 164,546 |
| Outstanding at Beginning, Weighted Average Grant Date Fair value | $ / shares | $ 14.36 |
| Weighted Average Grant Date Fair Value, Granted | $ / shares | 19.63 |
| Weighted Average Grant Date Fair Value, Terminated | $ / shares | 0 |
| Weighted Average Grant Date Fair Value, Vested | $ / shares | 14.46 |
| Outstanding at Ending, Weighted Average Grant Date Fair value | $ / shares | $ 16.37 |