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Note 3 - Securities (Details Textual)
3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
Equity Securities, FV-NI, Current $ 3,000     $ 3,000   $ 5,000
Equity Securities, FV-NI, Unrealized Gain (Loss), Total 1,000   $ (4,000) (2,000) $ (10,000)  
Equity Securities Sold, Amount $ 0 $ 0   $ 0 $ 0  
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions 239     239    
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions 109     109    
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 148     148    
Corporate Debt Securities [Member]            
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions 48     48    
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member]            
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions 33     33    
Commercial Mortgage-Backed Securities [Member]            
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions 6     6    
US Government Corporations and Agencies Securities [Member]            
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions 4     4