Note 8 - Share-based Compensation - Activity in Restricted Shares (Details) - Restricted Stock [Member]	9 Months Ended
	Sep. 30, 2023 $ / shares shares
Nonvested, shares (in shares) | shares	85,931
Nonvested, weighted average grant date fair value (in dollars per share) | $ / shares	$ 26.2
Granted, shares (in shares) | shares	93,147
Granted, weighted average grant date fair value (in dollars per share) | $ / shares	$ 16.19
Vested, shares (in shares) | shares	(47,067)
Vested, weighted average grant date fair value (in dollars per share) | $ / shares	$ 27.59
Forfeited/cancelled/expired, shares (in shares) | shares	(9,090)
Forfeited/cancelled/expired, weighted average grant date fair value (in dollars per share) | $ / shares	$ 21.76
Nonvested, shares (in shares) | shares	122,921
Nonvested, weighted average grant date fair value (in dollars per share) | $ / shares	$ 18.41