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Note 12 - Fair Value - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Securities available for sale $ 174,424 $ 165,579 [1]
IRLCs
Derivative liabilities 151 167
Fair Value, Measurements, Recurring [Member]    
Securities available for sale 174,424 165,579
Fair value loans 5,758 4,701
Deferred compensation assets 3,330 3,224
Deferred compensation liabilities 3,330 3,224
IRLCs  
Derivative liabilities 151 167
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]    
Securities available for sale 55 55
Fair value loans
Deferred compensation assets 3,330 3,224
Deferred compensation liabilities 3,330 3,224
IRLCs  
Derivative liabilities
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]    
Securities available for sale 174,369 165,524
Fair value loans 5,758 4,701
Deferred compensation assets
Deferred compensation liabilities
IRLCs  
Derivative liabilities 151 167
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Securities available for sale
Fair value loans
Deferred compensation assets
Deferred compensation liabilities
IRLCs  
Derivative liabilities
Fair Value, Measurements, Recurring [Member] | US Treasury Securities [Member]    
Securities available for sale 36,964  
Fair Value, Measurements, Recurring [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
Securities available for sale  
Fair Value, Measurements, Recurring [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Securities available for sale 36,964  
Fair Value, Measurements, Recurring [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 3 [Member]    
Securities available for sale  
Fair Value, Measurements, Recurring [Member] | US Government Agencies Debt Securities [Member]    
Securities available for sale 1,275 1,345
Fair Value, Measurements, Recurring [Member] | US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
Securities available for sale
Fair Value, Measurements, Recurring [Member] | US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Securities available for sale 1,275 1,345
Fair Value, Measurements, Recurring [Member] | US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]    
Securities available for sale
Fair Value, Measurements, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member]    
Securities available for sale 104,907 113,331
Fair Value, Measurements, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
Securities available for sale
Fair Value, Measurements, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Securities available for sale 104,907 113,331
Fair Value, Measurements, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]    
Securities available for sale
Fair Value, Measurements, Recurring [Member] | Single Issue Trust Preferred Securities [Member]    
Securities available for sale 8,962 19,939
Fair Value, Measurements, Recurring [Member] | Single Issue Trust Preferred Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
Securities available for sale
Fair Value, Measurements, Recurring [Member] | Single Issue Trust Preferred Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Securities available for sale 8,962 19,939
Fair Value, Measurements, Recurring [Member] | Single Issue Trust Preferred Securities [Member] | Fair Value, Inputs, Level 3 [Member]    
Securities available for sale
Fair Value, Measurements, Recurring [Member] | Mortgage-backed Agency Securities [Member]    
Securities available for sale 22,243 30,891
Fair Value, Measurements, Recurring [Member] | Mortgage-backed Agency Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
Securities available for sale
Fair Value, Measurements, Recurring [Member] | Mortgage-backed Agency Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Securities available for sale 22,243 30,891
Fair Value, Measurements, Recurring [Member] | Mortgage-backed Agency Securities [Member] | Fair Value, Inputs, Level 3 [Member]    
Securities available for sale
Fair Value, Measurements, Recurring [Member] | Equity Securities [Member]    
Securities available for sale 73 73
Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
Securities available for sale 55 55
Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Securities available for sale 18 18
Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]    
Securities available for sale
[1] Derived from audited financial statements