Note 12 - Stock-based Compensation - Stock Option Activity (Details)	9 Months Ended
	Sep. 30, 2023 $ / shares shares
Balance, number of shares (in shares) | shares	114,516
Balance, weighted average exercise price (in dollars per share) | $ / shares	$ 25.98
Granted, number of shares (in shares) | shares	52,574
Granted, weighted average exercise price (in dollars per share) | $ / shares	$ 313.67
Outstanding , number of shares (in shares) | shares	162,250
Outstanding, weighted average exercise price (in dollars per share) | $ / shares	$ 5.33
Vested and expected to vest, number of shares (in shares) | shares	329,340
Vested and expected to vest, weighted average exercise price (in dollars per share) | $ / shares	$ 61.73
Exercisable, number of shares (in shares) | shares	148,912
Exercisable, weighted average exercise price (in dollars per share) | $ / shares	$ 111.77