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Note 14 - Fair Value - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Available-for-sale debt securities $ 115,537 $ 153,116 [1]
Derivative liabilities 302
Debt securities available for sale 115,537 153,116 [1]
Derivative assets 12
Fair Value, Recurring [Member]    
Available-for-sale debt securities 115,537 153,116
Equity securities 55 55
Fair value loans 4,875 5,412
Deferred compensation assets 3,850 3,527
Deferred compensation liabilities 3,850 3,527
Derivative liabilities 302  
Debt securities available for sale 115,537 153,116
Derivative assets   12
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]    
Available-for-sale debt securities
Equity securities 55 55
Fair value loans
Deferred compensation assets 3,850 3,527
Deferred compensation liabilities 3,850 3,527
Derivative liabilities  
Debt securities available for sale
Derivative assets  
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]    
Available-for-sale debt securities 115,537 153,116
Equity securities
Fair value loans
Deferred compensation assets
Deferred compensation liabilities
Derivative liabilities 302  
Debt securities available for sale 115,537 153,116
Derivative assets   12
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Available-for-sale debt securities
Equity securities
Fair value loans 4,875 5,412
Deferred compensation assets
Deferred compensation liabilities
Derivative liabilities  
Debt securities available for sale
Derivative assets  
Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member]    
Available-for-sale debt securities 1,016 1,113
Debt securities available for sale 1,016 1,113
Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
Available-for-sale debt securities
Debt securities available for sale
Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Available-for-sale debt securities 1,016 1,113
Debt securities available for sale 1,016 1,113
Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]    
Available-for-sale debt securities
Debt securities available for sale
Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member]    
Available-for-sale debt securities 79,548 97,289
Debt securities available for sale 79,548 97,289
Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
Available-for-sale debt securities
Debt securities available for sale
Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Available-for-sale debt securities 79,548 97,289
Debt securities available for sale 79,548 97,289
Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]    
Available-for-sale debt securities
Debt securities available for sale
Fair Value, Recurring [Member] | US Treasury Securities [Member]    
Available-for-sale debt securities   19,960
Debt securities available for sale   19,960
Fair Value, Recurring [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
Available-for-sale debt securities  
Debt securities available for sale  
Fair Value, Recurring [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Available-for-sale debt securities   19,960
Debt securities available for sale   19,960
Fair Value, Recurring [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 3 [Member]    
Available-for-sale debt securities  
Debt securities available for sale  
Fair Value, Recurring [Member] | Mortgage-backed Agency Securities [Member]    
Available-for-sale debt securities 34,973 34,754
Debt securities available for sale 34,973 34,754
Fair Value, Recurring [Member] | Mortgage-backed Agency Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
Available-for-sale debt securities
Debt securities available for sale
Fair Value, Recurring [Member] | Mortgage-backed Agency Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Available-for-sale debt securities 34,973 34,754
Debt securities available for sale 34,973 34,754
Fair Value, Recurring [Member] | Mortgage-backed Agency Securities [Member] | Fair Value, Inputs, Level 3 [Member]    
Available-for-sale debt securities
Debt securities available for sale
[1] Derived from audited financial statements