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Note 14 - Disclosures About Fair Value of Assets and Liabilities - Fair Value of Assets Measured on Recurring Basis (Details) - USD ($)
Dec. 31, 2018
Dec. 31, 2017
Available-for-sale securities $ 86,266,197 $ 81,478,673
Fair Value, Measurements, Recurring [Member]    
Available-for-sale securities 86,266,000 81,478,000
Interest Rate Swaps 1,272,000 568,000
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]    
Available-for-sale securities
Interest Rate Swaps
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]    
Available-for-sale securities 86,266,000 81,478,000
Interest Rate Swaps 1,272,000 568,000
Fair Value, Inputs, Level 3 [Member]    
Available-for-sale securities 0  
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]    
Available-for-sale securities
Interest Rate Swaps
US States and Political Subdivisions Debt Securities [Member]    
Available-for-sale securities 33,770,520 33,898,458
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Measurements, Recurring [Member]    
Available-for-sale securities 33,770,000 33,898,000
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]    
Available-for-sale securities
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]    
Available-for-sale securities 33,770,000 33,898,000
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]    
Available-for-sale securities
Corporate Debt Securities [Member]    
Available-for-sale securities 3,018,927 3,065,000
Corporate Debt Securities [Member] | Fair Value, Measurements, Recurring [Member]    
Available-for-sale securities 3,019,000 3,065,000
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]    
Available-for-sale securities
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]    
Available-for-sale securities 3,019,000 3,065,000
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]    
Available-for-sale securities
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Available-for-sale securities 49,476,750 44,515,215
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Fair Value, Measurements, Recurring [Member]    
Available-for-sale securities 49,477,000 44,515,000
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]    
Available-for-sale securities
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]    
Available-for-sale securities 49,477,000 44,515,000
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]    
Available-for-sale securities