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Note 4 - Loans and Allowance for Credit Losses (Details Textual)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Financing Receivable, Nonaccrual, Interest Income     $ 0   $ 0  
Financing Receivable, Nonaccrual $ 403,853   403,853   655,410  
Financing Receivable, Allowance for Credit Loss 4,190,882 $ 4,516,402 4,190,882 $ 4,516,402 4,285,247 $ 4,150,198
Financing Receivable, Allowance for Credit Loss, Writeoff (0) $ (0) 155,779 $ (0) 0  
Financing Receivable, Modifications, Number of Contracts   0   0    
Financing Receivable, Modified, Subsequent Default     0      
Financing Receivable, Accrued Interest, after Allowance for Credit Loss 1,761,829   1,761,829   1,539,332  
Loans Acquired, Outstanding Balance 65,058,577   65,058,577   74,146,002  
Loans Acquired, Carrying Amount, Net 65,039,636   65,039,636   74,115,751  
Nonaccrual Loans [Member]            
Financing Receivable, Allowance for Credit Loss $ 332,551   332,551   450,000  
Financing Receivable, Allowance for Credit Loss, Writeoff     152,449      
Nonperforming Financial Instruments [Member]            
Financing Receivable, Nonaccrual, Interest Income     $ 38,334   $ 45,856  
Commercial Real Estate Portfolio Segment [Member]            
Financing Receivable, Number of Loans, Nonaccrual Status 1   1   1  
Financing Receivable, Nonaccrual $ 403,853   $ 403,853   $ 502,961  
Financing Receivable, Allowance for Credit Loss 2,437,163 $ 2,600,652 2,437,163 $ 2,600,652 2,449,988 2,818,582
Financing Receivable, Allowance for Credit Loss, Writeoff     0 (0) $ 0  
Commercial Portfolio Segment [Member]            
Financing Receivable, Number of Loans, Nonaccrual Status         1  
Financing Receivable, Nonaccrual 0   0   $ 152,449  
Financing Receivable, Allowance for Credit Loss $ 540,426 $ 476,625 540,426 476,625 493,502 $ 337,303
Financing Receivable, Allowance for Credit Loss, Writeoff     $ 152,449 $ (0) $ 0