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Note 18 - Fair Value and Interest Rate Risk - Quantitative Information About Level 3 Fair Value Measurements (Details) - Fair Value, Inputs, Level 3 [Member] - Fair Value of Collateral Approach [Member]
$ in Thousands
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Impaired loans, net $ 19,673 $ 6,500
Other Real Estate Owned $ 2,945  
Other Real Estate Owned 14  
Impaired loans, net $ 19,673 $ 6,500
Minimum [Member]    
Impaired loans, net 8 0
Maximum [Member]    
Impaired loans, net 21 8