Note 13 - Employee Benefit Plans - Restricted Stock Activity (Details) - Restricted Stock [Member]	12 Months Ended
	Dec. 31, 2020 $ / shares shares
Nonvested shares at beginning of period (in shares) | shares	57,653
Nonvested shares at beginning of period (in dollars per share) | $ / shares	$ 31.93
Granted (in shares) | shares	89,097
Granted (in dollars per share) | $ / shares	$ 21.20
Vested (in shares) | shares	(57,962)
Vested (in dollars per share) | $ / shares	$ 25.28
Canceled (in shares) | shares	(3,873)
Canceled (in dollars per share) | $ / shares	$ 29.92
Nonvested shares at end of period (in shares) | shares	84,915
Nonvested shares at end of period (in dollars per share) | $ / shares	$ 25.31