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Note 8 - Fair Value Measurements - Assets Measured at Fair Value on Recurring and Nonrecurring Basis (Details) - USD ($)
Mar. 31, 2020
Dec. 31, 2019
Securities available for sale $ 253,182,000 $ 254,562,000
Equity securities 1,400,000 1,700,000
Real Estate Acquired through Foreclosure, Fair Value Disclosure 0  
Other Consumer Loan [Member]    
Impaired loans 42,000  
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Securities available for sale 70,069,000 69,498,000
Agency Collateralized Mortgage Obligations [Member]    
Securities available for sale 41,609,000 43,084,000
US Government Agencies Debt Securities [Member]    
Securities available for sale 60,569,000 64,556,000
Municipal Notes [Member]    
Securities available for sale 80,935,000 77,424,000
Fair Value, Recurring [Member]    
Securities available for sale 253,182,000 254,562,000
Equity securities 1,352,000 1,746,000
Fair Value, Recurring [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Securities available for sale 70,069,000 69,498,000
Fair Value, Recurring [Member] | Agency Collateralized Mortgage Obligations [Member]    
Securities available for sale 41,609,000 43,084,000
Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member]    
Securities available for sale 60,569,000 64,556,000
Fair Value, Recurring [Member] | Municipal Notes [Member]    
Securities available for sale 80,935,000 77,424,000
Fair Value, Nonrecurring [Member]    
Impaired loans 2,732,000 2,731,000
Loans held for sale 3,085,000 4,176,000
Real Estate Acquired through Foreclosure, Fair Value Disclosure   170,000
Fair Value, Nonrecurring [Member] | Residential Mortgage Segment [Member]    
Impaired loans 1,825,000 1,910,000
Real Estate Acquired through Foreclosure, Fair Value Disclosure   170,000
Fair Value, Nonrecurring [Member] | Land Segment [Member]    
Impaired loans 115,000 115,000
Fair Value, Nonrecurring [Member] | Commercial Real Estate Segment [Member]    
Impaired loans 447,000 353,000
Fair Value, Nonrecurring [Member] | Commercial Business Segment [Member]    
Impaired loans 247,000 249,000
Fair Value, Nonrecurring [Member] | Home Equity and Second Mortgage [Member]    
Impaired loans 56,000 56,000
Fair Value, Nonrecurring [Member] | Other Consumer Loan [Member]    
Impaired loans   48,000
Fair Value, Inputs, Level 1 [Member] | Other Consumer Loan [Member]    
Impaired loans  
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member]    
Securities available for sale
Equity securities 1,352,000 1,746,000
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
Real Estate Acquired through Foreclosure, Fair Value Disclosure  
Fair Value, Inputs, Level 1 [Member] | Fair Value, Nonrecurring [Member] | Residential Mortgage Segment [Member]    
Impaired loans
Real Estate Acquired through Foreclosure, Fair Value Disclosure  
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] | Commercial Real Estate Segment [Member]    
Impaired loans
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 1 [Member] | Fair Value, Nonrecurring [Member] | Other Consumer Loan [Member]    
Impaired loans  
Fair Value, Inputs, Level 2 [Member] | Other Consumer Loan [Member]    
Impaired loans  
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member]    
Securities available for sale 253,182,000 254,562,000
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 70,069,000 69,498,000
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Agency Collateralized Mortgage Obligations [Member]    
Securities available for sale 41,609,000 43,084,000
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member]    
Securities available for sale 60,569,000 64,556,000
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Municipal Notes [Member]    
Securities available for sale 80,935,000 77,424,000
Fair Value, Inputs, Level 2 [Member] | Fair Value, Nonrecurring [Member]    
Impaired loans
Loans held for sale 3,085,000 4,176,000
Real Estate Acquired through Foreclosure, Fair Value Disclosure  
Fair Value, Inputs, Level 2 [Member] | Fair Value, Nonrecurring [Member] | Residential Mortgage Segment [Member]    
Impaired loans
Real Estate Acquired through Foreclosure, Fair Value Disclosure  
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] | Commercial Real Estate Segment [Member]    
Impaired loans
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 2 [Member] | Fair Value, Nonrecurring [Member] | Other Consumer Loan [Member]    
Impaired loans  
Fair Value, Inputs, Level 3 [Member] | Other Consumer Loan [Member]    
Impaired loans 42,000  
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 2,732,000 2,731,000
Loans held for sale
Real Estate Acquired through Foreclosure, Fair Value Disclosure   170,000
Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member] | Residential Mortgage Segment [Member]    
Impaired loans 1,825,000 1,910,000
Real Estate Acquired through Foreclosure, Fair Value Disclosure   170,000
Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member] | Land Segment [Member]    
Impaired loans 115,000 115,000
Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member] | Commercial Real Estate Segment [Member]    
Impaired loans 447,000 353,000
Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member] | Commercial Business Segment [Member]    
Impaired loans 247,000 249,000
Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member] | Home Equity and Second Mortgage [Member]    
Impaired loans $ 56,000 56,000
Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member] | Other Consumer Loan [Member]    
Impaired loans   $ 48,000