Note 12 - Share-based Compensation - Summary of Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands |
12 Months Ended |
Dec. 31, 2021 |
Dec. 31, 2020 |
Dec. 31, 2019 |
| Options on Common Shares, Outstanding (in shares) |
3,931,586
|
2,928,750
|
|
| Outstanding, weighted average exercise price (in dollars per share) |
$ 4.41
|
$ 2.96
|
|
| Outstanding, remaining contractual term (Year) |
4 years 9 months 14 days
|
4 years 9 months 18 days
|
3 years 8 months 15 days
|
| Options on Common Shares, Granted (in shares) |
1,254,500
|
1,423,836
|
|
| Granted, weighted average exercise price (in dollars per share) |
$ 5.33
|
$ 6.66
|
|
| Options on Common Shares, Exercised (in shares) |
(915,404)
|
(371,000)
|
|
| Exercised, weighted average exercise price (in dollars per share) |
$ 1.83
|
$ 1.90
|
|
| Options on Common Shares, Forfeited, cancelled, expired (in shares) |
(334,799)
|
(50,000)
|
|
| Forfeited, cancelled, expired, weighted average exercise price (in dollars per share) |
$ 5.14
|
$ 3.00
|
|
| Options on Common Shares, Outstanding (in shares) |
3,935,883
|
3,931,586
|
2,928,750
|
| Outstanding, weighted average exercise price (in dollars per share) |
$ 5.24
|
$ 4.41
|
$ 2.96
|
| Outstanding, aggregate intrinsic value |
$ 1,608
|
|
|
| Exercisable December 31, 2021 (in shares) |
2,415,063
|
|
|
| Exercisable weighted average exercise price (in dollars per share) |
$ 5.19
|
|
|
| Exercisable, remaining contractual term (Year) |
2 years 5 months 8 days
|
|
|
| Exercisable December 31, 2021 |
$ 1,608
|
|
|