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Note 13 - Accumulated Other Comprehensive Income (Loss) - Accumulated Other Comprehensive Income (Loss) by Component (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Balance $ 440,701 $ 406,297
Balance 443,232 409,702
Net current period other comprehensive income (loss) (11,791) 5,775
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]    
Balance 9,310 1,085
Net current period other comprehensive income gain (loss) (11,823)  
Balance (2,513) 7,123
Net current period other comprehensive income (loss)   6,038
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]    
Balance (122) (39)
Net current period other comprehensive income gain (loss) 32  
Balance (90) (302)
Net current period other comprehensive income (loss)   (263)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]    
Balance (447) (369)
Net current period other comprehensive income gain (loss) 0  
Balance (447) (369)
Net current period other comprehensive income (loss)   0
AOCI Attributable to Parent [Member]    
Balance 8,741 677
Net current period other comprehensive income gain (loss) (11,791)  
Balance (3,050) 6,452
Net current period other comprehensive income (loss) $ (11,791) $ 5,775