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Note 7 - Fair Value (Details Textual) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Jun. 30, 2022
Dec. 31, 2021
Jun. 30, 2021
Dec. 31, 2020
Impaired Loans, Fair Value Disclosure           $ 297,000    
Impaired Loans, Valuation Allowance           30,000    
Foreclosed Assets, Gross $ 598,000   $ 598,000     952,000    
Foreclosed Assets, Valuation Allowance 74,000 $ 336,000 74,000 $ 336,000 $ 200,000 227,000 $ 281,000 $ 0
Foreclosed Assets, Net of Valuation Reserve 524,000   524,000     $ 725,000    
Foreclosed Assets Valuation Adjustments, With Valuation Reserve 31,000 $ 124,000 31,000 $ 405,000        
Impaired Loans [Member]                
Impaired Loans, Valuation Allowance $ 30,000   $ 30,000