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Note 1 - Summary of Significant Accounting Policies (Details Textual)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
Mar. 07, 2022
Number of Operating Segments     2      
Debt Securities, Held-to-Maturity, Accrued Interest, after Allowance for Credit Loss $ 731,000,000,000   $ 731,000,000,000   $ 0  
Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Ending Balance 0   $ 0   0  
Mortgage Servicing Rights, Amortization Period (Year)     7 years      
Goodwill, Impairment Loss 0 $ 0 $ 0 $ 0 $ 0  
Cash Reserve Deposit Required and Made $ 200,000   $ 200,000      
Minimum [Member]            
Property, Plant and Equipment, Useful Life (Year)     3 years      
Maximum [Member]            
Property, Plant and Equipment, Useful Life (Year)     40 years      
Commonwealth [Member]            
Business Acquisition, Percentage of Voting Interests Acquired           100.00%
Landmark Financial Advisors, LLC (LFA) [Member]            
Business Acquisition, Percentage of Voting Interests Acquired           60.00%