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Note 15 - Stock-based Compensation - Summary of Outstanding Options (Details)
 12 Months Ended
Dec. 31, 2021
USD ($)
$ / shares
shares
Outstanding (in shares) | shares 2,423,466
Outstanding, weighted average exercise price (in dollars per share) | $ / shares $ 4.41
Issued (in shares) | shares 133,850
Issued, weighted average exercise price (in dollars per share) | $ / shares $ 37.37
Exercised (in shares) | shares (526,015)
Exercised, weighted average exercise price (in dollars per share) | $ / shares $ 3.58
Expired/Forfeited (in shares) | shares (13,332)
Expired/Forfeited, weighted average exercise price (in dollars per share) | $ / shares $ 15.30
Outstanding (in shares) | shares 2,017,969
Outstanding, weighted average exercise price (in dollars per share) | $ / shares $ 6.74
Outstanding, weighted average remaining contractual life (Year) 1 year 2 months 12 days
Outstanding, aggregate intrinsic value | $ $ 130,311,334
Exercisable (in shares) | shares 1,599,199
Exercisable, weighted average exercise price (in dollars per share) | $ / shares $ 3.82
Exercisable, weighted average remaining contractual life (Year) 8 months 12 days
Exercisable, aggregate intrinsic value | $ $ 107,945,775