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Note 16 - Comprehensive Income - Accumulated Other Comprehensive (Loss) (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Balance $ 1,241,704 $ 1,216,620 $ 1,178,751 $ 1,124,212
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member]        
Balance (69,632) (57,835)    
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]        
Balance 22,481 24,810    
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]        
Balance (695) (2,084)    
AOCI Attributable to Parent [Member]        
Balance $ (47,846) $ (35,109) $ (32,364) $ (1,404)