Note 7 - Comprehensive (Loss) Income - Accumulated Other Comprehensive (Loss) (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2021
Balance	$ 1,190,970	$ 1,178,751	$ 1,138,519	$ 1,124,212
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member]
Balance	(57,292)	(61,775)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Balance	26,328	32,360
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Balance	(2,898)	(2,949)
AOCI Attributable to Parent [Member]
Balance	$ (33,862)	$ (32,364)	$ (8,269)	$ (1,404)