Note 7 - Securities Sold Under Agreements to Repurchase - Securities Sold Under Agreement to Repurchase (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Securities sold under agreements to repurchase	$ 232,291	$ 121,521
Average daily balance during the year	239,089	224,878
Maximum daily balance during the year	$ 285,679	$ 278,227
Securities Sold under Agreements to Repurchase [Member]
Weighted average interest rate at year end	2.80%	2.17%
Weighted average interest rate during the year	3.12%	3.43%