Note 18 - Share-based Compensation - Activity for Nonvested Restricted Share Awards (Details) - Restricted Stock [Member]	12 Months Ended
	Dec. 31, 2021 $ / shares shares
Nonvested, shares (in shares) | shares	94,043
Nonvested, weighted-average grant date fair value (in dollars per share) | $ / shares	$ 55.81
Granted, shares (in shares) | shares	16,863
Granted, weighted-average grant date fair value (in dollars per share) | $ / shares	$ 79.34
Vested, shares (in shares) | shares	(19,332)
Vested, weighted-average grant date fair value (in dollars per share) | $ / shares	$ 59.81
Forfeited, shares (in shares) | shares	0
Forfeited, weighted-average grant date fair value (in dollars per share) | $ / shares	$ 0
Nonvested, shares (in shares) | shares	91,574
Nonvested, weighted-average grant date fair value (in dollars per share) | $ / shares	$ 59.30