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Note 6 - Bank Premises and Equipment - Major Classes of Bank Premises and Equipment (Details) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Property, plant and equipment, gross $ 33,984,000 $ 33,384,000
Less accumulated depreciation 16,644,000 15,573,000
Total bank premises and equipment, net 17,340,250 17,810,605
Land [Member]    
Property, plant and equipment, gross 4,038,000 4,056,000
Building and Building Improvements [Member]    
Property, plant and equipment, gross 21,803,000 21,560,000
Furniture and Fixtures [Member]    
Property, plant and equipment, gross $ 8,143,000 $ 7,768,000