Note 9 - 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		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Outstanding balance at end of period	$ 138,347		$ 138,347		$ 133,342
Weighted average interest rate at end of period	1.72%		1.72%		1.64%
Average outstanding balance during the period	$ 113,051	$ 140,169	$ 117,525	$ 115,761
Average interest rate during the period	1.33%	0.16%	1.43%	0.13%
Maximum outstanding at any month end during the period	$ 138,347	$ 161,512	$ 138,347	$ 161,512