Note 10 - Securities Sold Under Agreements to Repurchase - Securities Sold Under Agreements to Repurchase (Details) - Securities Sold under Agreements to Repurchase [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Outstanding balance at end of period	$ 124,567		$ 124,567		$ 75,466
Weighted average interest rate at end of period	0.64%		0.64%		0.04%
Average outstanding balance during the period	$ 139,749	$ 71,065	$ 123,845	$ 57,980
Average interest rate during the period	0.50%	0.03%	0.27%	0.04%
Maximum outstanding at any month end during the period	$ 139,825	$ 81,964	$ 149,179	$ 81,964