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Note 18 - Share-based Compensation - Activity for Stock Option Awards (Details)
 12 Months Ended
Dec. 31, 2020
$ / shares
shares
Outstanding, shares (in shares) | shares 1,071,777
Outstanding, weighted average exercise price (in dollars per share) | $ / shares $ 60.01
Granted (in shares) | shares 76,251
Granted, weighted average exercise price (in dollars per share) | $ / shares $ 81.20
Exercised, shares (in shares) | shares (110,595)
Exercised, weighted average exercise price (in dollars per share) | $ / shares $ 44.29
Forfeited (in shares) | shares (42,083)
Forfeited, weighted average exercise price (in dollars per share) | $ / shares $ 70.83
Expired, shares (in shares) | shares (4,687)
Expired, weighted average exercise price (in dollars per share) | $ / shares $ 68.01
Outstanding, shares (in shares) | shares 990,663
Outstanding, weighted average exercise price (in dollars per share) | $ / shares $ 62.90
Exercisable, shares (in shares) | shares 767,655
Exercisable, weighted average exercise price (in dollars per share) | $ / shares $ 61.04