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Note 3 - Securities (Details Textual)
3 Months Ended
Mar. 31, 2022
USD ($)
Mar. 31, 2021
USD ($)
Dec. 31, 2021
USD ($)
Equity Securities, FV-NI, Current $ 5,000   $ 5,000
Equity Securities, FV-NI, Unrealized Gain (Loss), Total (0) $ (2,000)  
Equity Securities Sold, Amount $ 0 $ 0  
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions 231    
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions 43    
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 133    
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member]      
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions 46    
Corporate Debt Securities [Member]      
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions 35    
Collateralized Mortgage-Backed Securities [Member]      
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions 13    
US Government Corporations and Agencies Securities [Member]      
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions 4