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Note 19 - Accumulated Other Comprehensive Income - Significant Amounts Reclassified Out of Each Component of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Unrealized gains on available-for-sale securities $ 886 [1] $ 303 [1] $ 323
Income taxes (301) [1] (103) [1] (110)
Net of tax $ 585 $ 200 $ 213
[1] Amounts in parentheses indicate expenses and other amounts indicate income.