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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 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Net loss on sale of securities $ 618 $ 618 $ 657
Income before income taxes 10,218 11,546 33,220 30,180
Income tax expense 1,118 3,894 6,186 9,908
Net income 9,100 7,652 27,034 20,272
Reclassification out of Accumulated Other Comprehensive Income [Member]        
Net income 545 41 657 532
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]        
Net loss on sale of securities 618 618 657
Income before income taxes 618 618 657
Income tax expense 130 130 246
Net income 488 488 411
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent [Member]        
Amortization [1] 57 57 171 171
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member]        
Amortization [1] 15 8 43 23
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]        
Income before income taxes 72 65 214 194
Income tax expense 15 24 45 73
Net income $ 57 $ 41 $ 169 $ 121
[1] Amortization is included in net periodic pension cost. See Note 10, "Employee Benefit Plans."