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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		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Outstanding balance at end of period	$ 113,894		$ 113,894		$ 133,342
Weighted average interest rate at end of period	1.76%		1.76%		1.64%
Average outstanding balance during the period	$ 127,063	$ 139,749	$ 120,740	$ 123,845
Average interest rate during the period	1.86%	0.50%	1.58%	0.27%
Maximum outstanding at any month end during the period	$ 127,931	$ 139,825	$ 138,347	$ 149,179

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