Note 8 - Share-based Compensation - Activity in Restricted Shares (Details) - Restricted Stock [Member]	6 Months Ended
	Jun. 30, 2023 $ / shares shares
Nonvested, shares (in shares) | shares	85,931
Nonvested, weighted average grant date fair value (in dollars per share) | $ / shares	$ 26.20
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	(46,940)
Vested, weighted average grant date fair value (in dollars per share) | $ / shares	$ 27.59
Forfeited/cancelled/expired, shares (in shares) | shares	(6,613)
Forfeited/cancelled/expired, weighted average grant date fair value (in dollars per share) | $ / shares	$ 23.60
Nonvested, shares (in shares) | shares	125,525
Nonvested, weighted average grant date fair value (in dollars per share) | $ / shares	$ 18.39