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Note 7 - Comprehensive (Loss) Income - Accumulated Other Comprehensive (Loss) (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Mar. 31, 2023
Dec. 31, 2022
Balance $ 1,216,609 $ 1,216,620 $ 1,190,970 $ 1,178,751
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member]        
Balance (66,743) (57,835)    
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]        
Balance 30,723 24,810    
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]        
Balance (2,112) (2,084)    
AOCI Attributable to Parent [Member]        
Balance $ (38,132) $ (35,109) $ (33,862) $ (32,364)