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Note 1 - Basis of Presentation (Details Textual)
Jan. 01, 2023
USD ($)
Dec. 01, 2022
USD ($)
shares
Sep. 30, 2023
USD ($)
Jun. 30, 2023
USD ($)
Dec. 31, 2022
USD ($)
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss     $ 0    
Retained Earnings (Accumulated Deficit)     98,717,000   $ 94,154,000
Accounting Standards Update 2016-13 [Member]          
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase $ 121,000        
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]          
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease) 5,400,000        
Retained Earnings (Accumulated Deficit) 4,400,000        
Commercial Portfolio Segment [Member] | Accounting Standards Update 2016-13 [Member]          
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease) $ 622,000        
Commercial Portfolio Segment [Member] | Minimum [Member]          
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process     250,000 $ 150,000  
Accrued Interest Receivable and Other Assets [Member]          
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss     1,700,000    
Interest Receivable     $ 5,200,000    
LBSI Insurance, LLC [Member]          
Business Acquisition, Percentage of Voting Interests Acquired   100.00%      
Liberty Bancshares Inc [Member]          
Business Combination, Amount Shares Issued to Acquiree's Shareholders Per Share (in shares) | shares   2.752      
Stock Issued During Period, Shares, Acquisitions (in shares) | shares   2,561,513      
Business Combination, Consideration Transferred   $ 73,265,000      
Number of Branches   6