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Note 15 - Share-based Payments - Share-based Payments (Details) - $ / shares
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Outstanding, Number of shares (in shares) 883,254 808,469 904,151 845,020
Outstanding, Weighted average exercise price per share (in dollars per share) $ 64.37 $ 55.55 $ 64.36 $ 55.31
Granted, Number of shares (in shares) 211,480 239,050 218,480 239,050
Granted, Weighted average exercise price per share (in dollars per share) $ 42.07 $ 79.43 $ 43.01 $ 79.43
Exercised, Number of shares (in shares) (975) (45,538) (12,567) (73,875)
Exercised, Weighted average exercise price per share (in dollars per share) $ 56.98 $ 43.24 $ 56.66 $ 44.82
Forfeited, Number of shares (in shares) (15,951) (9,498) (31,394) (17,562)
Forfeited, Weighted average exercise price per share (in dollars per share) $ 75.87 $ 61.23 $ 73.05 $ 61.00
Expired, Number of shares (in shares) (7,763) (1,386) (8,625) (1,536)
Expired, Weighted average exercise price per share (in dollars per share) $ 58.62 $ 61.93 $ 58.97 $ 61.93
Outstanding, Number of shares (in shares) 1,070,045 991,097 1,070,045 991,097
Outstanding, Weighted average exercise price per share (in dollars per share) $ 59.88 $ 61.81 $ 59.88 $ 61.81
Number exercisable (in shares) 540,937 438,437 540,937 438,437
Options exercisable, Weighted average exercise price per share (in dollars per share) $ 59.62 $ 53.16 $ 59.62 $ 53.16