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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, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Net loss on sale of securities $ (618) $ (43) $ (618)
Income before income taxes 11,736 10,218 37,399 33,220
Income tax expense 2,580 1,118 8,161 6,186
Net income 9,156 9,100 29,238 27,034
Net income 55 545 199 657
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent [Member]        
Income before income taxes [1] 65 57 193 171
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member]        
Income before income taxes [1] 5 15 16 43
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]        
Income before income taxes 70 72 209 214
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 618 43 618
Income before income taxes 618 43 618
Income tax expense 130 9 130
Net income 488 34 488
Income tax expense 15 15 44 45
Net income $ 55 $ 57 $ 165 $ 169
[1] Amortization is included in net periodic pension cost. See Note 11, "Employee Benefit Plans."