Note 8 - Share-based Compensation - Activity in Restricted Shares (Details) - Restricted Stock [Member]	9 Months Ended
	Sep. 30, 2022 $ / shares shares
Nonvested, shares (in shares) | shares	82,693
Nonvested, weighted average grant date fair value (in dollars per share) | $ / shares	$ 21.78
Granted, shares (in shares) | shares	53,543
Granted, weighted average grant date fair value (in dollars per share) | $ / shares	$ 30.76
Vested, shares (in shares) | shares	(42,815)
Vested, weighted average grant date fair value (in dollars per share) | $ / shares	$ 25.00
Forfeited/cancelled/expired, shares (in shares) | shares	(374)
Forfeited/cancelled/expired, weighted average grant date fair value (in dollars per share) | $ / shares	$ 30.99
Nonvested, shares (in shares) | shares	93,047
Nonvested, weighted average grant date fair value (in dollars per share) | $ / shares	$ 25.43