Note 10 - Stock-based Compensation Plan - Stock Option Activity (Details)	6 Months Ended
	Jun. 30, 2023 $ / shares shares
Options outstanding, number of shares (in shares) | shares	580,419
Options outstanding, weighted average exercise price (in dollars per share) | $ / shares	$ 8.91
Granted, number of shares (in shares) | shares	93,860
Granted, weighted average exercise price (in dollars per share) | $ / shares	$ 16.25
Exercised, number of shares (in shares) | shares	(111,800)
Exercised, weighted average exercise price (in dollars per share) | $ / shares	$ 8.05
Canceled, number of shares (in shares) | shares	(23,859)
Canceled, weighted average exercise price (in dollars per share) | $ / shares	$ 9.09
Options outstanding, number of shares (in shares) | shares	538,620
Options outstanding, weighted average exercise price (in dollars per share) | $ / shares	$ 10.36