Note 16 - Other Comprehensive Income (Loss) - Cumulative Other Comprehensive Income (Loss) Balances (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Balance	$ 602,110	$ 827,102	$ 844,809
Changes in unrealized gains on debt securities available for sale, net of tax	65,823	(305,769)	(64,748)
Balance	772,894	602,110	827,102
AOCI Attributable to Parent [Member]
Balance	(256,105)	49,664	114,412
Balance	$ (190,282)	(256,105)	49,664
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member]
Changes in unrealized gains on debt securities available for sale, net of tax		$ (305,769)	$ (64,748)