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Note 7 - Fair Value Measurements - Assets Measured at Fair Value on Recurring and Nonrecurring Basis (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Securities available for sale $ 277,162 $ 255,844
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Securities available for sale 119,497 108,237
Agency Collateralized Mortgage Obligations [Member]    
Securities available for sale 14,453 16,028
US Government Agencies Debt Securities [Member]    
Securities available for sale 71,023 68,662
Municipal Notes [Member]    
Securities available for sale 71,765 62,843
Mutual Funds [Member]    
Securities available for sale 424 74
Fair Value, Measurements, Recurring [Member]    
Securities available for sale 277,162 255,844
Fair Value, Measurements, Recurring [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Securities available for sale 119,497 108,237
Fair Value, Measurements, Recurring [Member] | Agency Collateralized Mortgage Obligations [Member]    
Securities available for sale 14,453 16,028
Fair Value, Measurements, Recurring [Member] | US Government Agencies Debt Securities [Member]    
Securities available for sale 71,023 68,662
Fair Value, Measurements, Recurring [Member] | Municipal Notes [Member]    
Securities available for sale 71,765 62,843
Fair Value, Measurements, Recurring [Member] | Mutual Funds [Member]    
Securities available for sale 424 74
Fair Value, Measurements, Nonrecurring [Member]    
Foreclosed real estate 3,953 4,674
Impaired loans 3,495 3,622
Loans held for sale 2,065 4,507
Fair Value, Measurements, Nonrecurring [Member] | Residential Mortgage Segment [Member]    
Foreclosed real estate 375 226
Impaired loans 2,694 2,060
Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Segment [Member]    
Foreclosed real estate 3,528 4,448
Impaired loans 435 100
Fair Value, Measurements, Nonrecurring [Member] | Commercial Business Segment [Member]    
Impaired loans 81 231
Fair Value, Measurements, Nonrecurring [Member] | Home Equity and Second Mortgage [Member]    
Impaired loans 245 14
Fair Value, Measurements, Nonrecurring [Member] | Other Consumer Segment [Member]    
Impaired loans 40  
Fair Value, Measurements, Nonrecurring [Member] | Land Segment [Member]    
Foreclosed real estate 50  
Impaired loans   1,217
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]    
Securities available for sale 424 74
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 0 0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Agency Collateralized Mortgage Obligations [Member]    
Securities available for sale 0 0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | US Government Agencies Debt Securities [Member]    
Securities available for sale 0 0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Municipal Notes [Member]    
Securities available for sale 0 0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Mutual Funds [Member]    
Securities available for sale 424 74
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Foreclosed real estate 0 0
Impaired loans 0 0
Loans held for sale 0 0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Residential Mortgage Segment [Member]    
Foreclosed real estate 0 0
Impaired loans 0 0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Segment [Member]    
Foreclosed real estate 0 0
Impaired loans 0 0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Commercial Business Segment [Member]    
Impaired loans 0 0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Home Equity and Second Mortgage [Member]    
Impaired loans 0 0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Other Consumer Segment [Member]    
Impaired loans 0  
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Land Segment [Member]    
Foreclosed real estate 0  
Impaired loans   0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]    
Securities available for sale 276,738 255,770
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 119,497 108,237
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Agency Collateralized Mortgage Obligations [Member]    
Securities available for sale 14,453 16,028
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | US Government Agencies Debt Securities [Member]    
Securities available for sale 71,023 68,662
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Municipal Notes [Member]    
Securities available for sale 71,765 62,843
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Mutual Funds [Member]    
Securities available for sale 0 0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Foreclosed real estate 0 0
Impaired loans 0 0
Loans held for sale 2,065 4,507
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Residential Mortgage Segment [Member]    
Foreclosed real estate 0 0
Impaired loans 0 0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Segment [Member]    
Foreclosed real estate 0 0
Impaired loans 0 0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Commercial Business Segment [Member]    
Impaired loans 0 0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Home Equity and Second Mortgage [Member]    
Impaired loans 0 0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Other Consumer Segment [Member]    
Impaired loans 0  
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Land Segment [Member]    
Foreclosed real estate 0  
Impaired loans   0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]    
Securities available for sale 0 0
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 0 0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Agency Collateralized Mortgage Obligations [Member]    
Securities available for sale 0 0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | US Government Agencies Debt Securities [Member]    
Securities available for sale 0 0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Municipal Notes [Member]    
Securities available for sale 0 0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Mutual Funds [Member]    
Securities available for sale 0 0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Foreclosed real estate 3,953 4,674
Impaired loans 3,495 3,622
Loans held for sale 0 0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Residential Mortgage Segment [Member]    
Foreclosed real estate 375 226
Impaired loans 2,694 2,060
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Segment [Member]    
Foreclosed real estate 3,528 4,448
Impaired loans 435 100
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Commercial Business Segment [Member]    
Impaired loans 81 231
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Home Equity and Second Mortgage [Member]    
Impaired loans 245 14
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Other Consumer Segment [Member]    
Impaired loans 40  
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Land Segment [Member]    
Foreclosed real estate $ 50  
Impaired loans   $ 1,217