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Note 12 - Accumulated Other Comprehensive Income (Loss) - Reclassifications Out of Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Income before income taxes $ 11,436 $ 9,257
Income tax expense 2,568 3,055
Net income 8,868 6,202
Reclassification out of Accumulated Other Comprehensive Income [Member]    
Net income 56 40
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]    
Amortization [1] 59 57
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]    
Amortization [1] 12 7
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]    
Income before income taxes 71 64
Income tax expense 15 24
Net income $ 56 $ 40
[1] Amortization is included in net periodic pension cost. See Note 10, "Employee Benefit Plans."