Note 8 - Equity Incentive Plans and Equity - Schedule Of Share Based Payment Award Stock Options Valuation Assumptions (Details) - Share-based Payment Arrangement, Option [Member] - $ / shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Weighted average exercise price of options granted (in dollars per share)	$ 155.00	$ 135.55	$ 48.64
Expected volatility	50.40%
Expected volatility		46.90%	47.60%
Expected volatility		51.50%	48.50%
Average expected terms in years (Year)	6 years 1 month 6 days
Risk-free interest rate	1.10%	0.30%	2.27%
Risk-free interest rate		1.69%
Expected dividend yield	0.00%	0.00%	0.00%
Minimum [Member]
Average expected terms in years (Year)		5 years 9 months 18 days	6 years
Maximum [Member]
Average expected terms in years (Year)		7 years	6 years 7 months 6 days