Note 13 - Stock Based Compensation - Nonvested Restricted Stock Activity (Details) - Restricted Stock [Member]	12 Months Ended
	Dec. 31, 2021 $ / shares shares
Nonvested, shares (in shares) | shares	58,539
Nonvested, weighted average grant date value per share (in dollars per share) | $ / shares	$ 34.81
Granted, shares (in shares) | shares	27,712
Granted, weighted average grant date value per share (in dollars per share) | $ / shares	$ 29.39
Vested, shares (in shares) | shares	(24,797)
Vested, weighted average grant date value per share (in dollars per share) | $ / shares	$ 36.04
Forfeited, shares (in shares) | shares	(2,993)
Forfeited, weighted average grant date value per share (in dollars per share) | $ / shares	$ 31.14
Nonvested, shares (in shares) | shares	58,461
Nonvested, weighted average grant date value per share (in dollars per share) | $ / shares	$ 31.91