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Note 8 - Comprehensive (Loss) Income - Accumulated Other Comprehensive (Loss) (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Jun. 30, 2024
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Dec. 31, 2022
Balance $ 1,239,496 $ 1,224,227 $ 1,216,620 $ 1,188,154 $ 1,199,397 $ 1,178,751
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member]            
Balance (51,111)   (57,835)      
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]            
Balance 16,409   24,810      
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]            
Balance (2,051)   (2,084)      
AOCI Attributable to Parent [Member]            
Balance $ (36,753) $ (42,244) $ (35,109) $ (53,414) $ (33,837) $ (32,364)