Note 13 - Share-based Compensation - Black-Scholes Option Pricing Model (Details) - $ / shares	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Expected volatility	34.70%	33.70%	32.80%
Expected dividends	0.00%	0.00%	0.00%
Risk-free interest rate	2.90%	0.80%	0.30%
Exercise price (in dollars per share)	$ 77.28	$ 57.34	$ 43.95
Expected term (years) (Year)	6 years 2 months 12 days	6 years 2 months 12 days	6 years 1 month 6 days
Weighted-average grant date fair value (in dollars per share)	$ 30.37	$ 19.60	$ 14.10