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Note 13 - Fair Value - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)
Mar. 31, 2018
Dec. 31, 2017
Available-for-sale debt securities $ 164,137,000 $ 165,525,000 [1]
Derivative assets 45,000
Derivative liabilities 90,000
Fair Value, Measurements, Recurring [Member]    
Available-for-sale debt securities 164,137,000 165,525
Equity securities 55,000 55,000
Fair value loans 5,825,000 5,739,000
Deferred compensation assets 4,070,000 4,002,000
Derivative assets 45,000  
Deferred compensation liabilities 4,070,000 4,002,000
Derivative liabilities   90,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]    
Available-for-sale debt securities
Equity securities 55,000 55,000
Fair value loans
Deferred compensation assets 4,070,000 4,002,000
Derivative assets  
Deferred compensation liabilities 4,070,000 4,002,000
Derivative liabilities  
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]    
Available-for-sale debt securities 164,137,000 165,525
Equity securities
Fair value loans 5,739,000
Deferred compensation assets
Derivative assets 45,000  
Deferred compensation liabilities
Derivative liabilities   90,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Available-for-sale debt securities
Equity securities
Fair value loans 5,825,000
Deferred compensation assets
Derivative assets  
Deferred compensation liabilities
Derivative liabilities  
Fair Value, Measurements, Recurring [Member] | US Government Agencies Debt Securities [Member]    
Available-for-sale debt securities 11,224,000 11,296,000
Fair Value, Measurements, Recurring [Member] | US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
Available-for-sale debt securities
Fair Value, Measurements, Recurring [Member] | US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Available-for-sale debt securities 11,224,000 11,296,000
Fair Value, Measurements, Recurring [Member] | US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]    
Available-for-sale debt securities
Fair Value, Measurements, Recurring [Member] | US Treasury Securities [Member]    
Available-for-sale debt securities 19,942,000 19,971,000
Fair Value, Measurements, Recurring [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
Available-for-sale debt securities
Fair Value, Measurements, Recurring [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Available-for-sale debt securities 19,942,000 19,971,000
Fair Value, Measurements, Recurring [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 3 [Member]    
Available-for-sale debt securities
Fair Value, Measurements, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member]    
Available-for-sale debt securities 100,339,000 103,648,000
Fair Value, Measurements, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
Available-for-sale debt securities
Fair Value, Measurements, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Available-for-sale debt securities 100,339,000 103,648,000
Fair Value, Measurements, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]    
Available-for-sale debt securities
Fair Value, Measurements, Recurring [Member] | Single Issue Trust Preferred Securities [Member]    
Available-for-sale debt securities 8,991,000 8,884,000
Fair Value, Measurements, Recurring [Member] | Single Issue Trust Preferred Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
Available-for-sale debt securities
Fair Value, Measurements, Recurring [Member] | Single Issue Trust Preferred Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Available-for-sale debt securities 8,991,000 8,884,000
Fair Value, Measurements, Recurring [Member] | Single Issue Trust Preferred Securities [Member] | Fair Value, Inputs, Level 3 [Member]    
Available-for-sale debt securities
Fair Value, Measurements, Recurring [Member] | Mortgage-backed Agency Securities [Member]    
Available-for-sale debt securities 23,641,000 21,726,000
Fair Value, Measurements, Recurring [Member] | Mortgage-backed Agency Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
Available-for-sale debt securities
Fair Value, Measurements, Recurring [Member] | Mortgage-backed Agency Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Available-for-sale debt securities 23,641,000 21,726,000
Fair Value, Measurements, Recurring [Member] | Mortgage-backed Agency Securities [Member] | Fair Value, Inputs, Level 3 [Member]    
Available-for-sale debt securities
[1] Derived from audited financial statements