Note 14 - Stock-based Compensation - Summary of Options Outstanding (Details)	6 Months Ended	12 Months Ended
	Jun. 30, 2022 USD ($) $ / shares shares	Dec. 31, 2021 $ / shares shares
Options outstanding, shares (in shares) | shares	374,926	866,956
Options outstanding, weighted average exercise price (in dollars per share) | $ / shares	$ 72.95	$ 72.11
Options granted, shares (in shares) | shares	302,655	55,706
Options granted, weighted average exercise price (in dollars per share) | $ / shares	$ 65.03	$ 70.80
Options exercised, shares (in shares) | shares	(16,454)	(541,736)
Options exercised, weighted average exercise price (in dollars per share) | $ / shares	$ 67.67	$ 71.39
Options cancelled, shares (in shares) | shares	(196,051)	(6,000)
Options cancelled, weighted average exercise price (in dollars per share) | $ / shares	$ 76.19	$ 72.94
Options outstanding, shares (in shares) | shares	465,076	374,926
Options outstanding, weighted average exercise price (in dollars per share) | $ / shares	$ 66.61	$ 72.95
Options outstanding, aggregate intrinsic value | $	$ 1,954,452
Options exercisable, shares (in shares) | shares	162,421
Options exercisable, weighted average exercise price (in dollars per share) | $ / shares	$ 69.56
Options exercisable, aggregate intrinsic value | $	$ 481,057