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Note 1a - Nature of Operations, Basis of Presentation and Summary of Significant Accounting Policies (Details Textual)
12 Months Ended
Dec. 31, 2024
USD ($)
shares
Dec. 31, 2023
USD ($)
shares
Dec. 31, 2022
USD ($)
Number of Operating Segments 1    
Non Accrual Contractual Due (Day) 90 days    
Financing Receivable, Individually Evaluated for Credit Loss $ 56,497,000 $ 69,963,000  
Stock Repurchase Program, Repurchased, Shares (in shares) | shares 283,270 904,152  
Goodwill, Impairment Loss $ 0 $ 0 $ 0
Minimum [Member]      
Financing Receivable, Individually Evaluated for Credit Loss $ 250,000    
Minimum [Member] | Land, Buildings and Improvements [Member]      
Property, Plant and Equipment, Useful Life (Year) 4 years    
Minimum [Member] | Furniture Fixtures and Equipment [Member]      
Property, Plant and Equipment, Useful Life (Year) 3 years    
Minimum [Member] | Nonaccrual Loans [Member]      
Financing Receivable, Individually Evaluated for Credit Loss $ 250,000    
Maximum [Member] | Land, Buildings and Improvements [Member]      
Property, Plant and Equipment, Useful Life (Year) 30 years    
Maximum [Member] | Furniture Fixtures and Equipment [Member]      
Property, Plant and Equipment, Useful Life (Year) 10 years