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Note 6 - Debt and Equity Securities (Details) - Gross Gains and Gross Losses Realized From the Sale of Securities - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Gross Gains and Gross Losses Realized From the Sale of Securities [Abstract]      
Gross gains from the sale of securities $ 2,899 $ 5,247 $ 5,222
Gross losses from the sale of securities (2,732) (2,372) (2,201)
Net gains from the sale of securities $ 167 $ 2,875 $ 3,021