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Note 15 - Stock-based Compensation - Stock Option Activity (Details)
 12 Months Ended
Dec. 31, 2020
USD ($)
$ / shares
shares
Shares issuable under options - Beginning of period, number of options (in shares) | shares 1,639,100
Shares issuable under options - Beginning of period, weighted average exercise price (in dollars per share) | $ / shares $ 60.26
Granted, number of options (in shares) | shares 542,000
Granted, weighted average exercise price (in dollars per share) | $ / shares $ 114.90
Exercised, number of options (in shares) | shares (294,238)
Exercised, weighted average exercise price (in dollars per share) | $ / shares $ 40.34
Forfeited, number of options (in shares) | shares (3,750)
Forfeited, weighted average exercise price (in dollars per share) | $ / shares $ 54.88
Shares issuable under options - end of period, number of options (in shares) | shares 1,883,112
Shares issuable under options - Beginning of period, weighted average exercise price (in dollars per share) | $ / shares $ 79.11
Shares issuable under options - end of period, weighted average remaining contractual life (Year) 2 years 219 days
Shares issuable under options - end of period, aggregate intrinsic value | $ $ 108,772
Options exercisable - End of period, number of options (in shares) | shares 714,014
Options exercisable - End of period, weighted average exercise price (in dollars per share) | $ / shares $ 60.63
Options exercisable - End of period, weighted average remaining contractual life (Year) 1 year 219 days
Options exercisable - End of period, aggregate instrinsic value | $ $ 54,383,000