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Note 20 - Fair Value Measurements - Assets Measured at Fair Value on Recurring and Nonrecurring Basis (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Available-for-sale Securities $ 271,172 $ 255,770
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Available-for-sale Securities 112,649 108,237
Agency Collateralized Mortgage Obligations [Member]    
Available-for-sale Securities 15,323 16,028
US Government Agencies Debt Securities [Member]    
Available-for-sale Securities 69,028 68,662
Municipal Notes [Member]    
Available-for-sale Securities 74,172 62,843
Fair Value, Measurements, Recurring [Member]    
Available-for-sale Securities 271,172 255,770
Fair Value, Measurements, Recurring [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Available-for-sale Securities 112,649 108,237
Fair Value, Measurements, Recurring [Member] | Agency Collateralized Mortgage Obligations [Member]    
Available-for-sale Securities 15,323 16,028
Fair Value, Measurements, Recurring [Member] | US Government Agencies Debt Securities [Member]    
Available-for-sale Securities 69,028 68,662
Fair Value, Measurements, Recurring [Member] | Municipal Notes [Member]    
Available-for-sale Securities 74,172 62,843
Fair Value, Measurements, Nonrecurring [Member]    
Impaired loans 3,371 3,622
Loans held for sale 2,630 4,507
Foreclosed real estate 3,971 4,674
Fair Value, Measurements, Nonrecurring [Member] | Residential Mortgage Segment [Member]    
Impaired loans 2,872 2,060
Foreclosed real estate 443 226
Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Segment [Member]    
Impaired loans 401 1,217
Foreclosed real estate 3,528 4,448
Fair Value, Measurements, Nonrecurring [Member] | Commercial Business Segment [Member]    
Impaired loans 38 100
Fair Value, Measurements, Nonrecurring [Member] | Home Equity and Second Mortgage [Member]    
Impaired loans 60 231
Fair Value, Measurements, Nonrecurring [Member] | Other Consumer Loan [Member]    
Impaired loans   14
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]    
Available-for-sale Securities
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Available-for-sale Securities
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Agency Collateralized Mortgage Obligations [Member]    
Available-for-sale Securities
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | US Government Agencies Debt Securities [Member]    
Available-for-sale Securities
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Municipal Notes [Member]    
Available-for-sale Securities
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Impaired loans
Loans held for sale
Foreclosed real estate
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Residential Mortgage Segment [Member]    
Impaired loans
Foreclosed real estate
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Segment [Member]    
Impaired loans
Foreclosed real estate
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Commercial Business Segment [Member]    
Impaired loans
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Home Equity and Second Mortgage [Member]    
Impaired loans
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Other Consumer Loan [Member]    
Impaired loans  
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]    
Available-for-sale Securities 271,172 255,770
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Available-for-sale Securities 112,649 108,237
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Agency Collateralized Mortgage Obligations [Member]    
Available-for-sale Securities 15,323 16,028
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | US Government Agencies Debt Securities [Member]    
Available-for-sale Securities 69,028 68,662
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Municipal Notes [Member]    
Available-for-sale Securities 74,172 62,843
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Impaired loans
Loans held for sale 2,630 4,507
Foreclosed real estate
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Residential Mortgage Segment [Member]    
Impaired loans
Foreclosed real estate
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Segment [Member]    
Impaired loans
Foreclosed real estate
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Commercial Business Segment [Member]    
Impaired loans
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Home Equity and Second Mortgage [Member]    
Impaired loans
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Other Consumer Loan [Member]    
Impaired loans  
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]    
Available-for-sale Securities
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Available-for-sale Securities
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Agency Collateralized Mortgage Obligations [Member]    
Available-for-sale Securities
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | US Government Agencies Debt Securities [Member]    
Available-for-sale Securities
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Municipal Notes [Member]    
Available-for-sale Securities
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Impaired loans 3,371 3,622
Loans held for sale
Foreclosed real estate 3,971 4,674
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Residential Mortgage Segment [Member]    
Impaired loans 2,872 2,060
Foreclosed real estate 443 226
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Segment [Member]    
Impaired loans 401 1,217
Foreclosed real estate 3,528 4,448
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Commercial Business Segment [Member]    
Impaired loans 38 100
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Home Equity and Second Mortgage [Member]    
Impaired loans $ 60 231
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Other Consumer Loan [Member]    
Impaired loans   $ 14