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Note 8 - Fair Value Measurements - Assets Measured at Fair Value on Recurring and Nonrecurring Basis (Details) - USD ($)
Sep. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]      
Fair Value $ 0   $ 0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Agency Collateralized Mortgage Obligations [Member]      
Fair Value 0   0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | US Government Agencies Debt Securities [Member]      
Fair Value 0   0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Municipal Notes [Member]      
Fair Value 0   0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Mutual Funds [Member]      
Fair Value 103,000   118,000
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]      
Fair Value 103,000   118,000
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Residential Mortgage Segment [Member]      
Impaired loans 0   0
Foreclosed real estate 0   0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Segment [Member]      
Impaired loans 0   0
Foreclosed real estate 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]      
Impaired loans     0
Foreclosed real estate   $ 0  
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Nonrecurring [Member]      
Impaired loans 0   0
Loans held for sale 0   0
Foreclosed real estate 0   0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]      
Fair Value 99,052,000   42,010,000
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Agency Collateralized Mortgage Obligations [Member]      
Fair Value 17,225,000   9,331,000
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | US Government Agencies Debt Securities [Member]      
Fair Value 72,461,000   84,453,000
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Municipal Notes [Member]      
Fair Value 58,409,000   50,839,000
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Mutual Funds [Member]      
Fair Value 0   0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]      
Fair Value 247,147,000   186,633,000
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Residential Mortgage Segment [Member]      
Impaired loans 0   0
Foreclosed real estate 0   0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Segment [Member]      
Impaired loans 0   0
Foreclosed real estate 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]      
Impaired loans     0
Foreclosed real estate   0  
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Nonrecurring [Member]      
Impaired loans 0   0
Loans held for sale 2,553,000   3,081,000
Foreclosed real estate 0   0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]      
Fair Value 0   0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Agency Collateralized Mortgage Obligations [Member]      
Fair Value 0   0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | US Government Agencies Debt Securities [Member]      
Fair Value 0   0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Municipal Notes [Member]      
Fair Value 0   0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Mutual Funds [Member]      
Fair Value 0   0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]      
Fair Value 0   0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Residential Mortgage Segment [Member]      
Impaired loans 2,019,000   1,990,000
Foreclosed real estate 519,000   557,000
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Segment [Member]      
Impaired loans 2,983,000   3,574,000
Foreclosed real estate 3,735,000   4,130,000
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Commercial Business Segment [Member]      
Impaired loans 61,000   67,000
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Home Equity and Second Mortgage [Member]      
Impaired loans 49,000   125,000
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Other Consumer Segment [Member]      
Impaired loans 24,000    
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Land Segment [Member]      
Impaired loans     203,000
Foreclosed real estate   24,000  
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]      
Impaired loans 5,136,000   5,780,000
Loans held for sale 0   0
Foreclosed real estate 4,254,000   4,890,000
Fair Value, Measurements, Recurring [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]      
Fair Value 99,052,000   42,010,000
Fair Value, Measurements, Recurring [Member] | Agency Collateralized Mortgage Obligations [Member]      
Fair Value 17,225,000   9,331,000
Fair Value, Measurements, Recurring [Member] | US Government Agencies Debt Securities [Member]      
Fair Value 72,461,000   84,453,000
Fair Value, Measurements, Recurring [Member] | Municipal Notes [Member]      
Fair Value 58,409,000   50,839,000
Fair Value, Measurements, Recurring [Member] | Mutual Funds [Member]      
Fair Value 103,000   118,000
Fair Value, Measurements, Recurring [Member]      
Fair Value 247,250,000   186,751,000
Fair Value, Measurements, Nonrecurring [Member] | Residential Mortgage Segment [Member]      
Impaired loans 2,019,000   1,990,000
Foreclosed real estate 519,000   557,000
Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Segment [Member]      
Impaired loans 2,983,000   3,574,000
Foreclosed real estate 3,735,000   4,130,000
Fair Value, Measurements, Nonrecurring [Member] | Commercial Business Segment [Member]      
Impaired loans 61,000   67,000
Fair Value, Measurements, Nonrecurring [Member] | Home Equity and Second Mortgage [Member]      
Impaired loans 49,000   125,000
Fair Value, Measurements, Nonrecurring [Member] | Other Consumer Segment [Member]      
Impaired loans 24,000    
Fair Value, Measurements, Nonrecurring [Member] | Land Segment [Member]      
Impaired loans     203,000
Foreclosed real estate   $ 24,000  
Fair Value, Measurements, Nonrecurring [Member]      
Impaired loans 5,136,000   5,780,000
Loans held for sale 2,553,000   3,081,000
Foreclosed real estate 4,254,000   4,890,000
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]      
Fair Value 99,052,000   42,010,000
Agency Collateralized Mortgage Obligations [Member]      
Fair Value 17,225,000   9,331,000
US Government Agencies Debt Securities [Member]      
Fair Value 72,461,000   84,453,000
Municipal Notes [Member]      
Fair Value 58,409,000   50,839,000
Mutual Funds [Member]      
Fair Value 103,000   118,000
Fair Value $ 247,250,000   $ 186,751,000