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Note 3 - Securities (Details Textual)
3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Equity Securities, FV-NI $ 12,000   $ 12,000   $ 19,000
Equity Securities, FV-NI, Unrealized Gain (Loss), Total (2,000) $ 6,000 (7,000) $ 16,000  
Equity Securities Sold, Amount $ 0 $ 0 $ 0 $ 0  
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions 36   36    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions 6   6    
Other-than-temporary Impairment Loss, Debt Securities, Available-for-sale, Total     $ 0    
US States and Political Subdivisions Debt Securities [Member]          
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions 16   16    
Corporate Debt Securities [Member]          
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions 11   11    
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]          
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions 6   6    
Collateralized Mortgage Backed Securities [Member]          
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions 3   3