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Note 8 - Fair Value Measurements - Assets Measured at Fair Value on Recurring and Nonrecurring Basis (Details) - USD ($)
Mar. 31, 2019
Dec. 31, 2018
Securities available for sale $ 255,035,000 $ 261,841,000
Equity securities 1,800,000  
Fair Value, Recurring [Member]    
Securities available for sale 255,035,000 261,841,000
Equity securities 1,845,000 1,715,000
Fair Value, Recurring [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Securities available for sale 87,375,000 91,257,000
Fair Value, Recurring [Member] | Agency Collateralized Mortgage Obligations [Member]    
Securities available for sale 36,096,000 32,992,000
Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member]    
Securities available for sale 65,201,000 74,504,000
Fair Value, Recurring [Member] | Municipal Notes [Member]    
Securities available for sale 66,363,000 63,088,000
Fair Value, Nonrecurring [Member]    
Impaired loans 3,879,000 3,737,000
Loans held for sale 1,377,000 2,849,000
Foreclosed real estate 2,999,000 3,142,000
Fair Value, Nonrecurring [Member] | Residential Mortgage Segment [Member]    
Impaired loans 2,301,000 2,181,000
Foreclosed real estate 15,000 33,000
Fair Value, Nonrecurring [Member] | Land Segment [Member]    
Impaired loans 189,000 152,000
Fair Value, Nonrecurring [Member] | Residential Construction [Member]    
Impaired loans 525,000 521,000
Fair Value, Nonrecurring [Member] | Commercial Real Estate Segment [Member]    
Impaired loans 418,000 422,000
Foreclosed real estate 2,984,000 3,109,000
Fair Value, Nonrecurring [Member] | Commercial Business Segment [Member]    
Impaired loans 421,000 426,000
Fair Value, Nonrecurring [Member] | Home Equity and Second Mortgage [Member]    
Impaired loans 25,000 35,000
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member]    
Securities available for sale
Equity securities 1,845,000 1,715,000
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Securities available for sale
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Agency Collateralized Mortgage Obligations [Member]    
Securities available for sale
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member]    
Securities available for sale
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Municipal Notes [Member]    
Securities available for sale
Fair Value, Inputs, Level 1 [Member] | Fair Value, Nonrecurring [Member]    
Impaired loans
Loans held for sale
Foreclosed real estate
Fair Value, Inputs, Level 1 [Member] | Fair Value, Nonrecurring [Member] | Residential Mortgage Segment [Member]    
Impaired loans
Foreclosed real estate
Fair Value, Inputs, Level 1 [Member] | Fair Value, Nonrecurring [Member] | Land Segment [Member]    
Impaired loans
Fair Value, Inputs, Level 1 [Member] | Fair Value, Nonrecurring [Member] | Residential Construction [Member]    
Impaired loans
Fair Value, Inputs, Level 1 [Member] | Fair Value, Nonrecurring [Member] | Commercial Real Estate Segment [Member]    
Impaired loans
Foreclosed real estate
Fair Value, Inputs, Level 1 [Member] | Fair Value, Nonrecurring [Member] | Commercial Business Segment [Member]    
Impaired loans
Fair Value, Inputs, Level 1 [Member] | Fair Value, Nonrecurring [Member] | Home Equity and Second Mortgage [Member]    
Impaired loans
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member]    
Securities available for sale 255,035,000 261,841,000
Equity securities
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Securities available for sale 87,375,000 91,257,000
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Agency Collateralized Mortgage Obligations [Member]    
Securities available for sale 36,096,000 32,992,000
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member]    
Securities available for sale 65,201,000 74,504,000
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Municipal Notes [Member]    
Securities available for sale 66,363,000 63,088,000
Fair Value, Inputs, Level 2 [Member] | Fair Value, Nonrecurring [Member]    
Impaired loans
Loans held for sale 1,377,000 2,849,000
Foreclosed real estate
Fair Value, Inputs, Level 2 [Member] | Fair Value, Nonrecurring [Member] | Residential Mortgage Segment [Member]    
Impaired loans
Foreclosed real estate
Fair Value, Inputs, Level 2 [Member] | Fair Value, Nonrecurring [Member] | Land Segment [Member]    
Impaired loans
Fair Value, Inputs, Level 2 [Member] | Fair Value, Nonrecurring [Member] | Residential Construction [Member]    
Impaired loans
Fair Value, Inputs, Level 2 [Member] | Fair Value, Nonrecurring [Member] | Commercial Real Estate Segment [Member]    
Impaired loans
Foreclosed real estate
Fair Value, Inputs, Level 2 [Member] | Fair Value, Nonrecurring [Member] | Commercial Business Segment [Member]    
Impaired loans
Fair Value, Inputs, Level 2 [Member] | Fair Value, Nonrecurring [Member] | Home Equity and Second Mortgage [Member]    
Impaired loans
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]    
Securities available for sale
Equity securities
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Securities available for sale
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Agency Collateralized Mortgage Obligations [Member]    
Securities available for sale
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member]    
Securities available for sale
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Municipal Notes [Member]    
Securities available for sale
Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member]    
Impaired loans 3,879,000 3,737,000
Loans held for sale
Foreclosed real estate 2,999,000 3,142,000
Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member] | Residential Mortgage Segment [Member]    
Impaired loans 2,301,000 2,181,000
Foreclosed real estate 15,000 33,000
Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member] | Land Segment [Member]    
Impaired loans 189,000 152,000
Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member] | Residential Construction [Member]    
Impaired loans 525,000 521,000
Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member] | Commercial Real Estate Segment [Member]    
Impaired loans 418,000 422,000
Foreclosed real estate 2,984,000 3,109,000
Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member] | Commercial Business Segment [Member]    
Impaired loans 421,000 426,000
Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member] | Home Equity and Second Mortgage [Member]    
Impaired loans $ 25,000 $ 35,000