Note 9 - Equity Incentive Plans and Equity - Stock Options Activity (Details) - Service Period Stock Options [Member] $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($) $ / shares shares
Balance (in shares) | shares	1,287
Balance, weighted average exercise price (in dollars per share) | $ / shares	$ 50.37
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) | shares	40
Granted, weighted average exercise price (in dollars per share) | $ / shares	$ 67.02
Exercised (in shares) | shares	(9)
Exercised, weighted average exercise price (in dollars per share) | $ / shares	$ 76.07
Forfeited (in shares) | shares	(27)
Forfeited, weighted average exercise price (in dollars per share) | $ / shares	$ 62.08
Balance (in shares) | shares	1,291
Balance, weighted average exercise price (in dollars per share) | $ / shares	$ 51.63
Balance, average remaining contractual term (Year)	5 years 4 months 28 days
Balance, aggregate intrinsic value | $	$ 33,958
Exercisable (in shares) | shares	1,040
Exercisable, weighted average exercise price (in dollars per share) | $ / shares	$ 32.61
Exercisable, average remaining contractual term (Year)	4 years 8 months 8 days
Exercisable, aggregate intrinsic value | $	$ 33,958