Note 9 - Equity Incentive Plans and Equity - Restricted Stock Units Award Activity (Details)	12 Months Ended
	Dec. 31, 2022 $ / shares shares
Restricted Stock Units (RSUs) [Member]
Balance (in shares) | shares	103
Balance, weighted average grant date fair value (in dollars per share) | $ / shares	$ 96.18
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) | shares	230
Granted, weighted average grant date fair value (in dollars per share) | $ / shares	$ 67.99
Exercised/Vested (in shares) | shares	(47)
Exercised/Vested, weighted average grant date fair value (in dollars per share) | $ / shares	$ 112.57
Forfeited (in shares) | shares	(8)
Forfeited, weighted average grant date fair value (in dollars per share) | $ / shares	$ 105.62
Balance (in shares) | shares	278
Balance, weighted average grant date fair value (in dollars per share) | $ / shares	$ 74.52
Performance Based Restricted Stock Units [Member]
Balance (in shares) | shares	22
Balance, weighted average grant date fair value (in dollars per share) | $ / shares	$ 111.65
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) | shares	158
Granted, weighted average grant date fair value (in dollars per share) | $ / shares	$ 57.52
Forfeited (in shares) | shares	(4)
Forfeited, weighted average grant date fair value (in dollars per share) | $ / shares	$ 113.33
Balance (in shares) | shares	176
Balance, weighted average grant date fair value (in dollars per share) | $ / shares	$ 63.01