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Note 12 - Stock-based Compensation - Summary of Outstanding Options (Details)
 3 Months Ended
Mar. 31, 2022
USD ($)
$ / shares
shares
Outstanding (in shares) | shares 2,017,969
Outstanding, weighted average exercise price (in dollars per share) | $ / shares $ 6.74
Issued (in shares) | shares 0
Issued, weighted average exercise price (in dollars per share) | $ / shares $ 0
Exercised (in shares) | shares (1,000,534)
Exercised, weighted average exercise price (in dollars per share) | $ / shares $ 2.79
Expired/Forfeited (in shares) | shares (1,000)
Expired/Forfeited, weighted average exercise price (in dollars per share) | $ / shares $ 15.30
Outstanding (in shares) | shares 1,016,435
Outstanding, weighted average exercise price (in dollars per share) | $ / shares $ 10.63
Outstanding, weighted average remaining contractual life (Year) 1 year 10 months 24 days
Outstanding, aggregate intrinsic value | $ $ 41,834,424
Exercisable (in shares) | shares 815,666
Exercisable, weighted average exercise price (in dollars per share) | $ / shares $ 6.19
Exercisable, weighted average remaining contractual life (Year) 1 year 6 months
Exercisable, aggregate intrinsic value | $ $ 37,191,595