Note 10 - Stock Based Compensation - Nonvested Restricted Stock Activity (Details) - Restricted Stock [Member]	3 Months Ended
	Mar. 31, 2022 $ / shares shares
Nonvested, shares (in shares) | shares	58,461
Nonvested, weighted average grant date value per share (in dollars per share) | $ / shares	$ 31.91
Granted, shares (in shares) | shares	31,232
Granted, weighted average grant date value per share (in dollars per share) | $ / shares	$ 38.06
Vested, shares (in shares) | shares	(12,575)
Vested, weighted average grant date value per share (in dollars per share) | $ / shares	$ 32.06
Forfeited, shares (in shares) | shares	(274)
Forfeited, weighted average grant date value per share (in dollars per share) | $ / shares	$ 31.63
Nonvested, shares (in shares) | shares	76,844
Nonvested, weighted average grant date value per share (in dollars per share) | $ / shares	$ 34.39