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Note 12 - Stock-based Compensation (Tables) | 3 Months Ended
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Mar. 31, 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 |  |  | (1,000,534 | ) |  | $ | 2.79 |  |  |  |  |  |  |  |  |
Expired/Forfeited |  |  | (1,000 | ) |  | $ | 15.30 |  |  |  |  |  |  |  |  |
Outstanding at March 31, 2022 |  |  | 1,016,435 |  |  | $ | 10.63 |  |  |  | 1.9 |  |  | $ | 41,834,424 |
Exercisable at March 31, 2022 |  |  | 815,666 |  |  | $ | 6.19 |  |  |  | 1.5 |  |  | $ | 37,191,595 |

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