Note 7 - Comprehensive (Loss) Income - Accumulated Other Comprehensive (Loss) (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020
Balance	$ 1,148,295	$ 1,143,147	$ 1,124,212	$ 1,098,433	$ 964,960	$ 915,310
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member]
Balance	(67,734)		(484)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Balance	32,913		2,406
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Balance	(1,671)		(3,326)
AOCI Attributable to Parent [Member]
Balance	$ (36,492)	$ (19,103)	$ (1,404)	$ (973)	$ (190)	$ 2,797