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Note 1 - Summary of Significant Accounting Policies (Details Textual)
12 Months Ended
Dec. 31, 2022
USD ($)
Jan. 01, 2023
USD ($)
Dec. 31, 2021
USD ($)
Subsidiary, Ownership Percentage By Parent 100.00%    
Number of Banking Offices 4    
Financing Receivable, Held-for-Sale, Not Part of Disposal Group, after Valuation Allowance, Ending Balance $ 7,058,000   $ 11,768,000
Financing Receivable, Ratio of Allowance to Total Loans 1.20%    
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]      
Financing Receivable, Allowance for Credit Loss, Ending Balance   $ (1,900,000)  
Financing Receivable, Ratio of Allowance to Total Loans   0.76%