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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 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Gain recognized $ 0 $ 0 $ 0 $ 385
Income before income taxes 17,480 10,508 36,512 20,575
Income tax expense 4,077 2,270 8,507 4,465
Net income 13,403 8,238 28,005 16,110
Reclassification out of Accumulated Other Comprehensive Income [Member]        
Gain recognized 0 0 0 (385)
Net income 76 76 152 (152)
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 (385)
Income tax expense 0 0 0 (81)
Net income 0 0 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 61 100
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member]        
Other operating expense 66 47 132 93
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]        
Income before income taxes 97 97 193 193
Income tax expense 21 21 41 41
Net income $ 76 $ 76 $ 152 $ 152