Note 12 - Stock-based Compensation Plan - Stock Option Activity (Details)	3 Months Ended
	Mar. 31, 2022 $ / shares shares
Options outstanding, number of shares (in shares) | shares	408,869
Options outstanding, weighted average exercise price (in dollars per share) | $ / shares	$ 9.07
Granted, number of shares (in shares) | shares	38,540
Granted, weighted average exercise price (in dollars per share) | $ / shares	$ 9.76
Exercised, number of shares (in shares) | shares	0
Exercised, weighted average exercise price (in dollars per share) | $ / shares	$ 0
Canceled, number of shares (in shares) | shares	0
Canceled, weighted average exercise price (in dollars per share) | $ / shares	$ 0
Options outstanding, number of shares (in shares) | shares	447,409
Options outstanding, weighted average exercise price (in dollars per share) | $ / shares	$ 9.13