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Note 13 - Accumulated Other Comprehensive Income (Loss) - Reclassifications Out of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Income before income taxes $ 17,462 $ 16,424 $ 44,498 $ 52,936
Income tax expense 4,111 3,816 10,419 12,323
Net income 13,351 12,608 34,079 40,613
Reclassification out of Accumulated Other Comprehensive Income [Member]        
Gain recognized 0 0 0 0
Net income 27 76 80 228
Reclassification out of Accumulated Other Comprehensive Income [Member] | AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member]        
Income before income taxes 0 0 0 0
Income tax expense 0 0 0 0
Net income 0 0 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 0 92
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member]        
Other operating expense 34 65 101 197
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]        
Income before income taxes 34 96 101 289
Income tax expense 7 20 21 61
Net income $ 27 $ 76 $ 80 $ 228