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Note 12 - Accumulated Other Comprehensive Income (Loss) - Reclassifications Out of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Gain recognized $ 0 $ 385
Income before income taxes 19,032 10,067
Income tax expense 4,430 2,195
Net income 14,602 7,872
Reclassification out of Accumulated Other Comprehensive Income [Member]    
Gain recognized 0 (385)
Net income 77 (228)
Reclassification out of Accumulated Other Comprehensive Income [Member] | AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]    
Income before income taxes 0 (385)
Income tax expense 0 (81)
Net income 0 (304)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent [Member]    
Other operating expense 31 50
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member]    
Other operating expense 66 46
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]    
Income before income taxes 97 96
Income tax expense 20 20
Net income $ 77 $ 76