Note 12 - Employee Benefits - Non-vested Performance Unit Award Activity (Details) - Performance Shares [Member]	12 Months Ended
	Dec. 31, 2021 $ / shares shares
Nonvested, shares (in shares) | shares	154,361
Nonvested, weighted average grant date fair value (in dollars per share) | $ / shares	$ 13.99
Granted, shares (in shares) | shares	98,400
Granted, weighted average grant date fair value (in dollars per share) | $ / shares	$ 17.36
Vested, shares (in shares) | shares	(120,635)	[1]
Vested, weighted average grant date fair value (in dollars per share) | $ / shares	$ 14.43
Nonvested, shares (in shares) | shares	132,126
Nonvested, weighted average grant date fair value (in dollars per share) | $ / shares	$ 16.10

[1] This number of performance unit award shares vested based on our financial performance in 2021 and was distributed in March 2022. The fair value of unit award shares that vested in 2021 was $1.7 million.