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Note 15 - Share-based Payments - Stock Option Transactions (Details) - $ / shares
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Outstanding, Number of shares (in shares) 808,469 730,037 845,020 754,497
Outstanding, Weighted average exercise price per share (in dollars per share) $ 55.55 $ 50.85 $ 55.31 $ 49.94
Granted, Number of shares (in shares) 239,050 190,025 239,050 195,525
Granted, Weighted average exercise price per share (in dollars per share) $ 79.43 $ 59.53 $ 79.43 $ 59.19
Exercised, Number of shares (in shares) (45,538) (16,922) (73,875) (41,935)
Exercised, Weighted average exercise price per share (in dollars per share) $ 43.24 $ 9.79 $ 44.82 $ 16.23
Forfeited, Number of shares (in shares) (9,498) (4,826) (17,562) (8,315)
Forfeited, Weighted average exercise price per share (in dollars per share) $ 61.23 $ 59.15 $ 61.00 $ 60.23
Expired, Number of shares (in shares) (1,386) (1,036) (1,536) (2,494)
Expired, Weighted average exercise price per share (in dollars per share) $ 61.93 $ 58.39 $ 61.93 $ 59.86
Outstanding, Number of shares (in shares) 991,097 897,278 991,097 897,278
Outstanding, Weighted average exercise price per share (in dollars per share) $ 61.81 $ 53.41 $ 61.81 $ 53.41
Options exercisable, Number of shares (in shares) 438,437 390,868 438,437 390,868
Options exercisable, Weighted average exercise price per share (in dollars per share) $ 53.16 $ 46.20 $ 53.16 $ 46.20