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Note 7 - Fair Value - Assets Measured at Fair Value on a Recurring Basis (Details) - USD ($)
Jun. 30, 2020
Dec. 31, 2019
Securities - available-for-sale $ 91,387,000 $ 120,107,000
Securities - equity investments 14,000 19,000
Fair Value, Inputs, Level 1 [Member]    
Securities - available-for-sale
Securities - equity investments 14,000 19,000
Fair Value, Inputs, Level 2 [Member]    
Securities - available-for-sale 87,365,000 116,085,000
Securities - equity investments
Fair Value, Inputs, Level 3 [Member]    
Securities - available-for-sale 4,022,000 4,022,000
Securities - equity investments
US Government-sponsored Enterprises Debt Securities [Member]    
Securities - available-for-sale 1,022,000 7,077,000
US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
Securities - available-for-sale
US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Securities - available-for-sale 1,022,000 7,077,000
US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]    
Securities - available-for-sale
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Securities - available-for-sale 19,145,000 41,075,000
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Fair Value, Inputs, Level 1 [Member]    
Securities - available-for-sale
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Fair Value, Inputs, Level 2 [Member]    
Securities - available-for-sale 19,145,000 41,075,000
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Fair Value, Inputs, Level 3 [Member]    
Securities - available-for-sale
Collateralized Mortgage Obligations [Member]    
Securities - available-for-sale 20,631,000 32,837,000
Collateralized Mortgage Obligations [Member] | Fair Value, Inputs, Level 1 [Member]    
Securities - available-for-sale
Collateralized Mortgage Obligations [Member] | Fair Value, Inputs, Level 2 [Member]    
Securities - available-for-sale 20,631,000 32,837,000
Collateralized Mortgage Obligations [Member] | Fair Value, Inputs, Level 3 [Member]    
Securities - available-for-sale
US States and Political Subdivisions Debt Securities [Member]    
Securities - available-for-sale 38,062,000 27,796,000
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
Securities - available-for-sale
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Securities - available-for-sale 38,062,000 27,796,000
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]    
Securities - available-for-sale
Corporate Debt Securities [Member]    
Securities - available-for-sale 12,527,000 11,322,000
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
Securities - available-for-sale
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Securities - available-for-sale 8,505,000 7,300,000
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]    
Securities - available-for-sale $ 4,022,000 $ 4,022,000