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Note 15 - Fair Values (Details) - Losses Resulting from Nonrecurring Fair Value Adjustments - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Note 15 - Fair Values (Details) - Losses Resulting from Nonrecurring Fair Value Adjustments [Line Items]    
Losses resulting from nonrecurring fair value adjustments $ 219 $ 67
Impaired Loans [Member]    
Note 15 - Fair Values (Details) - Losses Resulting from Nonrecurring Fair Value Adjustments [Line Items]    
Losses resulting from nonrecurring fair value adjustments 164 52
Other Real Estate Owned [Member]    
Note 15 - Fair Values (Details) - Losses Resulting from Nonrecurring Fair Value Adjustments [Line Items]    
Losses resulting from nonrecurring fair value adjustments $ 55 $ 15