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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 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Net loss on sale of securities $ (43) $ (43)
Income before income taxes 13,402 11,566 25,663 23,002
Income tax expense 2,951 2,500 5,581 5,068
Net income 10,451 9,066 20,082 17,934
Net income 89 56 144 112
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent [Member]        
Income before income taxes [1] 64 55 128 114
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member]        
Income before income taxes 6 16 11 28
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]        
Income before income taxes 70 71 139 142
Reclassification out of Accumulated Other Comprehensive Income [Member] | AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]        
Net loss on sale of securities 43 43
Net impairment losses recognized in earnings
Income before income taxes 43 43
Income tax expense 9 9
Net income 34 34
Income tax expense 15 15 29 30
Net income $ 55 $ 56 $ 110 $ 112
[1] Amortization is included in net periodic pension cost. See Note 11, "Employee Benefit Plans."