Note 13 - Stock-based Compensation Plan - Unvested Stock Activity (Details) - Restricted Stock [Member]	6 Months Ended
	Jun. 30, 2022 $ / shares shares
Unvested shares outstanding (in shares) | shares	262,533
Unvested shares outstanding, weighted average exercise price (in dollars per share) | $ / shares	$ 7.16
Granted, number of shares (in shares) | shares	123,533
Granted, weighted average exercise price (in dollars per share) | $ / shares	$ 9.21
Vested, number of shares (in shares) | shares	(51,710)
Vested, weighted average exercise price (in dollars per share) | $ / shares	$ 8.93
Forfeited, number of shares (in shares) | shares	0
Forfeited, weighted average exercise price (in dollars per share) | $ / shares	$ 0
Unvested shares outstanding (in shares) | shares	334,356
Unvested shares outstanding, weighted average exercise price (in dollars per share) | $ / shares	$ 7.65