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Note 8 - Fair Value Measurements - Assets Measured at Fair Value on Recurring and Nonrecurring Basis (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Securities available for sale $ 264,843 $ 271,172
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Securities available for sale 106,745 112,649
Agency Collateralized Mortgage Obligations [Member]    
Securities available for sale 18,249 15,323
US Government Agencies Debt Securities [Member]    
Securities available for sale 69,048 69,028
Municipal Notes [Member]    
Securities available for sale 70,801 74,172
Fair Value, Measurements, Recurring [Member]    
Securities available for sale 264,843 271,172
Fair Value, Measurements, Recurring [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Securities available for sale 106,745 112,649
Fair Value, Measurements, Recurring [Member] | Agency Collateralized Mortgage Obligations [Member]    
Securities available for sale 18,249 15,323
Fair Value, Measurements, Recurring [Member] | US Government Agencies Debt Securities [Member]    
Securities available for sale 69,048 69,028
Fair Value, Measurements, Recurring [Member] | Municipal Notes [Member]    
Securities available for sale 70,801 74,172
Fair Value, Measurements, Nonrecurring [Member]    
Impaired loans 3,563 3,371
Loans held for sale 2,141 2,630
Foreclosed real estate 3,809 3,971
Fair Value, Measurements, Nonrecurring [Member] | Residential Mortgage Segment [Member]    
Impaired loans 2,702 2,872
Foreclosed real estate 281 443
Fair Value, Measurements, Nonrecurring [Member] | Land Segment [Member]    
Impaired loans 94  
Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Segment [Member]    
Impaired loans 365 401
Foreclosed real estate 3,528 3,528
Fair Value, Measurements, Nonrecurring [Member] | Commercial Business Segment [Member]    
Impaired loans 316 38
Fair Value, Measurements, Nonrecurring [Member] | Home Equity and Second Mortgage [Member]    
Impaired loans 78 60
Fair Value, Measurements, Nonrecurring [Member] | Other Consumer Segment [Member]    
Impaired loans 8  
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]    
Securities available for sale
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Securities available for sale
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Agency Collateralized Mortgage Obligations [Member]    
Securities available for sale
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | US Government Agencies Debt Securities [Member]    
Securities available for sale
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Municipal Notes [Member]    
Securities available for sale
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] | Land Segment [Member]    
Impaired loans  
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 Segment [Member]    
Impaired loans  
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]    
Securities available for sale 264,843 271,172
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Securities available for sale 106,745 112,649
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Agency Collateralized Mortgage Obligations [Member]    
Securities available for sale 18,249 15,323
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | US Government Agencies Debt Securities [Member]    
Securities available for sale 69,048 69,028
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Municipal Notes [Member]    
Securities available for sale 70,801 74,172
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Impaired loans
Loans held for sale 2,141 2,630
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] | Land Segment [Member]    
Impaired loans  
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 Segment [Member]    
Impaired loans  
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]    
Securities available for sale
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Securities available for sale
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Agency Collateralized Mortgage Obligations [Member]    
Securities available for sale
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | US Government Agencies Debt Securities [Member]    
Securities available for sale
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Municipal Notes [Member]    
Securities available for sale
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Impaired loans 3,563 3,371
Loans held for sale
Foreclosed real estate 3,809 3,971
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Residential Mortgage Segment [Member]    
Impaired loans 2,702 2,872
Foreclosed real estate 281 443
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Land Segment [Member]    
Impaired loans 94  
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Segment [Member]    
Impaired loans 365 401
Foreclosed real estate 3,528 3,528
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Commercial Business Segment [Member]    
Impaired loans 316 38
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Home Equity and Second Mortgage [Member]    
Impaired loans 78 $ 60
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Other Consumer Segment [Member]    
Impaired loans $ 8