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Note 2 - Securities (Details Textual)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2022
USD ($)
Mar. 31, 2021
USD ($)
Dec. 31, 2021
USD ($)
Par Value of Restricted Stock Out of Outstanding Capital Required by FRB 3.00%    
Percentage of Par Value of Federal Reserve Banks Restricted Stock Outstanding Capital Subject to Call 3.00%    
Par Value of Restricted Stock Out of Outstanding Borrowings Required by FHLB 3.75%    
Other than Temporary Impairment Losses, Investments $ 0   $ 0
Debt Securities, Available-for-Sale, Realized Gain (Loss), Total 0 $ 0  
Proceeds from Sale of Debt Securities, Available-for-Sale 0 $ 0  
Investment in Federal Home Loan Bank Stock [Member]      
Other than Temporary Impairment Losses, Investments $ 0    
US Treasury Securities [Member]      
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions 22    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions 0    
Other-than-temporary Impairment Loss, Debt Securities, Available-for-sale, Total $ 0    
US Government-sponsored Enterprises Debt Securities [Member]      
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions 41    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions 14    
Other-than-temporary Impairment Loss, Debt Securities, Available-for-sale, Total $ 0    
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member]      
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions 82    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions 9    
Other-than-temporary Impairment Loss, Debt Securities, Available-for-sale, Total $ 0    
Collateralized Mortgage-Backed Securities [Member]      
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions 49    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions 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 66    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions 11    
Other-than-temporary Impairment Loss, Debt Securities, Available-for-sale, Total $ 0    
Corporate Debt Securities [Member]      
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions 6    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions 0    
Other-than-temporary Impairment Loss, Debt Securities, Available-for-sale, Total $ 0    
Corporate Debt Securities [Member] | Moody's, Baa2 Rating [Member]      
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions 1