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Note 7 - Common Stock Options (Tables) | 12 Months Ended
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Dec. 31, 2021
Notes Tables |
Share-based Payment Arrangement, Option, Activity [Table Text Block] |
|  | Options |  |  | Exercise Price |  |  | Weighted-Average Exercise Price |
Options outstanding at December 31, 2018 |  |  | 5,535,439 |  |  | $2.50 | - | $21.99 |  |  | $ | 7.30 |
Granted |  |  | 2,563,500 |  |  | 5.15 | - | 19.87 |  |  |  | 9.36 |
Exercised |  |  | (771,376 | ) |  | 2.5 | - | 15 |  |  |  | 4.62 |
Forfeitures |  |  | (361,833 | ) |  | 2.50 | - | 16.50 |  |  |  | 7.53 |
Options outstanding at December 31, 2019 |  |  | 6,965,730 |  |  | $2.71 | - | $21.99 |  |  |  | 6.09 |
Granted |  |  | 230,500 |  |  | 8.89 | - | 21.80 |  |  |  | 16.85 |
Exercised |  |  | (1,784,763 | ) |  | 2.71 | - | 19.09 |  |  |  | 6.08 |
Forfeitures |  |  | (84,042 | ) |  | 4.26 | - | 21.80 |  |  |  | 8.55 |
Options outstanding at December 31, 2020 |  |  | 5,327,425 |  |  | $2.71 | - | $21.99 |  |  |  | 6.09 |
Granted |  |  | 809,500 |  |  | $11.35 | - | $20.20 |  |  |  | 13.47 |
Exercised |  |  | (1,348,374 | ) |  | $3.27 | - | $15.00 |  |  |  | 7.78 |
Forfeitures |  |  | (131,874 | ) |  | $4.14 | - | $21.99 |  |  |  | 12.23 |
Options outstanding at December 31, 2021 |  |  | 4,656,677 |  |  | $2.71 | - | $21.74 |  |  |  | 10.68 |

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