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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, 2022
Mar. 31, 2021
Income before income taxes $ 12,400 $ 19,032
Income tax expense 2,885 4,430
Net income 9,515 14,602
Reclassification out of Accumulated Other Comprehensive Income [Member]    
Gain recognized 0 0
Net income 27 77
Reclassification out of Accumulated Other Comprehensive Income [Member] | AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member]    
Income before income taxes 0 0
Income tax expense 0 0
Net income 0 0
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent [Member]    
Other operating expense 0 31
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member]    
Other operating expense 34 66
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]    
Income before income taxes 34 97
Income tax expense 7 20
Net income $ 27 $ 77