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Note 8 - Other Comprehensive Income (Details) - Other Comprehensive Income - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Other Comprehensive Income [Abstract]        
Unrealized holding (losses) gains arising during the period $ (46) $ 108 $ 221 $ 501
Unrealized holding (losses) gains arising during the period 19   (85)  
Unrealized holding (losses) gains arising during the period $ (27) $ 108 $ 136 $ 501