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Note 4 - Debt and Equity Securities (Details) - Gross Gain Loss Realized from Available for Sale Securities - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Gross Gain Loss Realized from Available for Sale Securities [Abstract]        
Gross gains from the sale of securities $ 2,666 $ 5,247 $ 2,899 $ 5,247
Gross losses from the sale of securities (2,563) (31) (2,732) (31)
Net gains from the sale of securities $ 103 $ 5,216 $ 167 $ 5,216