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Note 13 - Stock-based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2022
Notes Tables |
Share-Based Payment Arrangement, Option, Activity [Table Text Block] |
|  | Number of Shares |  |  | Weighted-Average Exercise Price |  |  | Weighted-Average of Remaining Contractual Life (in years) |  |  | Aggregate Intrinsic Value |
Outstanding at December 31, 2021 |  |  | 2,017,969 |  |  | $ | 6.74 |  |  |  |  |  |  |  |  |
Issued |  |  | — |  |  | $ | — |  |  |  |  |  |  |  |  |
Exercised |  |  | (1,204,404 | ) |  | $ | 3.01 |  |  |  |  |  |  |  |  |
Expired/Forfeited |  |  | (4,332 | ) |  | $ | 15.30 |  |  |  |  |  |  |  |  |
Outstanding at September 30, 2022 |  |  | 809,233 |  |  | $ | 12.25 |  |  |  | 1.8 |  |  | $ | 12,801,797 |
Exercisable at September 30, 2022 |  |  | 639,745 |  |  | $ | 8.37 |  |  |  | 1.4 |  |  | $ | 11,924,577 |

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