Note 7 - Share-based Compensation - Restricted Stock Activity (Details) - Restricted Stock [Member] |
3 Months Ended |
|---|---|
|
Mar. 31, 2020
$ / shares
shares
| |
| Unvested outstanding at beginning of period (in shares) | shares | 429,399 |
| Unvested outstanding at beginning of period (in dollars per share) | $ / shares | $ 13.25 |
| Unvested granted (in shares) | shares | 175,971 |
| Granted, grant date fair value (in dollars per share) | $ / shares | $ 9.43 |
| Vested (in shares) | shares | (53,026) |
| Vested, grant date fair value (in dollars per share) | $ / shares | $ 12.90 |
| Forfeited (in shares) | shares | (7,000) |
| Forfeited, grant date fair value (in dollars per share) | $ / shares | $ 15.92 |
| Unvested outstanding (in shares) | shares | 545,344 |
| Unvested outstanding, grant date fair value (in dollars per share) | $ / shares | $ 12.01 |