Note 18 - Share-based Compensation - Activity for Stock Option Awards (Details)	12 Months Ended
	Dec. 31, 2021 $ / shares shares
Outstanding, shares (in shares) | shares	990,663
Outstanding, weighted average exercise price (in dollars per share) | $ / shares	$ 62.90
Granted (in shares) | shares	73,274
Granted, weighted average exercise price (in dollars per share) | $ / shares	$ 79.14
Exercised, shares (in shares) | shares	(147,890)
Exercised, weighted average exercise price (in dollars per share) | $ / shares	$ 51.88
Forfeited (in shares) | shares	(5,912)
Forfeited, weighted average exercise price (in dollars per share) | $ / shares	$ 64.42
Expired, shares (in shares) | shares	(863)
Expired, weighted average exercise price (in dollars per share) | $ / shares	$ 73.72
Outstanding, shares (in shares) | shares	909,272
Outstanding, weighted average exercise price (in dollars per share) | $ / shares	$ 65.98
Exercisable, shares (in shares) | shares	743,371
Exercisable, weighted average exercise price (in dollars per share) | $ / shares	$ 64.03