Note 10 - Stock-based Compensation Plan - Unvested Stock Activity (Details) - Restricted Stock [Member]	6 Months Ended
	Jun. 30, 2023 $ / shares shares
Unvested shares outstanding (in shares) | shares	288,450
Unvested shares outstanding, weighted average exercise price (in dollars per share) | $ / shares	$ 7.80
Granted, number of shares (in shares) | shares	97,461
Granted, weighted average exercise price (in dollars per share) | $ / shares	$ 16.43
Vested, number of shares (in shares) | shares	(57,559)
Vested, weighted average exercise price (in dollars per share) | $ / shares	$ 10.99
Forfeited, number of shares (in shares) | shares	(13,271)
Forfeited, weighted average exercise price (in dollars per share) | $ / shares	$ 9.88
Unvested shares outstanding (in shares) | shares	315,081
Unvested shares outstanding, weighted average exercise price (in dollars per share) | $ / shares	$ 9.72