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Note 6 - Premises and Equipment - Premises and Equipment (Details) - USD ($)
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Property, Plant and Equipment, Gross $ 14,764,119 $ 13,936,977
Accumulated depreciation and amortization 8,180,667 7,750,383
Property, Plant and Equipment, Net 6,583,452 6,186,594
Depreciation and amortization expense 466,559 445,939
Land and Land Improvements [Member]    
Property, Plant and Equipment, Gross 2,602,998 2,602,998
Building and Building Improvements [Member]    
Property, Plant and Equipment, Gross $ 6,718,452 6,171,003
Building and Building Improvements [Member] | Minimum [Member]    
Property, Plant and Equipment, Estimated Useful Lives (Year) 15 years  
Building and Building Improvements [Member] | Maximum [Member]    
Property, Plant and Equipment, Estimated Useful Lives (Year) 39 years  
Furniture and Fixtures [Member]    
Property, Plant and Equipment, Gross $ 5,442,669 $ 5,162,976
Furniture and Fixtures [Member] | Minimum [Member]    
Property, Plant and Equipment, Estimated Useful Lives (Year) 3 years  
Furniture and Fixtures [Member] | Maximum [Member]    
Property, Plant and Equipment, Estimated Useful Lives (Year) 10 years