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Note 7 - Fair Value (Details Textual) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Dec. 31, 2020
Impaired Loans, Fair Value Disclosure     $ 297,000  
Impaired Loans, Valuation Allowance     30,000  
Increase (Decrease) in Impaired Loans Valuation Allowance     30,000  
Foreclosed Assets, Gross $ 913,000   952,000  
Foreclosed Assets, Valuation Allowance 219,000 $ 0 227,000 $ 0
Foreclosed Assets, Net of Valuation Reserve 694,000   $ 725,000  
Foreclosed Assets Valuation Adjustments, With Valuation Reserve $ 0 0    
Impaired Loans [Member]        
Impaired Loans, Valuation Allowance   $ 28,000