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Note 14 - Stock-based Compensation - Stock Option Activity (Details)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2023
USD ($)
$ / shares
shares
Balance (in shares) | shares 2,337,573
Balance (in dollars per share) | $ / shares $ 120.06
Granted, number of options (in shares) | shares 615,000
Granted, weighted average exercise price (in dollars per share) | $ / shares $ 142.2
Exercised, number of options (in shares) | shares (455,934)
Exercised, weighted average exercise price (in dollars per share) | $ / shares $ 73.73
Forfeited, number of options (in shares) | shares (75,890)
Forfeited, weighted average exercise price (in dollars per share) | $ / shares $ 144.43
Balance (in shares) | shares 2,420,749
Balance (in dollars per share) | $ / shares $ 133.65
Shares issuable under options - end of period, weighted average remaining contractual life (Year) 2 years 6 months
Shares issuable under options - end of period, aggregate intrinsic value | $ $ 68,849
Options exercisable - End of period, number of options (in shares) | shares 1,044,891
Options exercisable - End of period, weighted average exercise price (in dollars per share) | $ / shares $ 120.6
Options exercisable - End of period, weighted average remaining contractual life (Year) 1 year 7 months 6 days
Options exercisable - End of period, aggregate instrinsic value | $ $ 43,351