Note 7 - Comprehensive (Loss) Income - Accumulated Other Comprehensive (Loss) (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020
Balance	$ 1,143,147	$ 1,138,519	$ 1,124,212	$ 964,960	$ 935,637	$ 915,310
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member]
Balance	(39,293)		(484)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Balance	21,873		2,406
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Balance	(1,683)		(3,326)
AOCI Attributable to Parent [Member]
Balance	$ (19,103)	$ (8,269)	$ (1,404)	$ (190)	$ (689)	$ 2,797