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Note 24 - Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss (Details) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Before tax amount $ (70,144) $ (535,769)    
Tax effect 16,766 104,734    
Net-of-tax amount 88,968,366 84,631,882 $ 80,478,592 $ 74,891,493
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]        
Before tax amount 4,871,052 1,092,554    
Accumulated Other Comprehensive Income (Loss), Derivative Qualifying as Hedge, Excluded Component, Including Portion Attributable to Noncontrolling Interest [Member]        
Before tax amount (4,941,196) (1,628,323)    
AOCI Attributable to Parent [Member]        
Net-of-tax amount $ (53,378) $ (431,035) $ (452,756) $ (206,193)