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Consolidated Statements of Changes in Shareholders' Equity (Unaudited) - USD ($)
Total
Common Stock
Additional Paid-In Capital
Treasury Stock
Accumulated Other Comprehensive Income
Retained Earnings
Balance at at Dec. 31, 2017 $ 77,923,454 $ 31,539 $ 12,212,844 $ (4,330,712) $ 2,932,122 $ 67,077,661
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net Income 1,730,117         1,730,117
Other Comprehensive Income, Net Of Tax: (3,095,804)       (3,095,804)  
Cash Dividends on Common Stock (265,889)         265,889
Balance at at Mar. 31, 2018 76,299,897 31,543 12,220,859 (4,330,712) 447,409 67,930,798
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Stock Issued During Period, Value, Stock Options Exercised 8,019 4        
Adjustments to Additional Paid in Capital, Share-based Compensation, Stock Options, Requisite Service Period Recognition     8,015      
Balance at at Dec. 31, 2017 77,923,454 31,539 12,212,844 (4,330,712) 2,932,122 67,077,661
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net Income 5,657,763          
Other Comprehensive Income, Net Of Tax: (5,907,428)          
Balance at at Sep. 30, 2018 76,886,413 31,544 12,223,149 (4,330,712) (2,364,215) 71,326,647
Balance at at Mar. 31, 2018 76,299,897 31,543 12,220,859 (4,330,712) 447,409 67,930,798
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net Income 1,819,954         1,819,954
Other Comprehensive Income, Net Of Tax: (905,077)       (905,077)  
Cash Dividends on Common Stock (265,898)         265,898
Balance at at Jun. 30, 2018 76,951,167 31,544 12,223,149 (4,330,712) (457,668) 69,484,854
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Stock Issued During Period, Value, Stock Options Exercised 2,291 1        
Adjustments to Additional Paid in Capital, Share-based Compensation, Stock Options, Requisite Service Period Recognition     2,290      
Net Income 2,107,692         2,107,692
Other Comprehensive Income, Net Of Tax: (1,906,547)       (1,906,547)  
Cash Dividends on Common Stock (265,899)         265,899
Balance at at Sep. 30, 2018 76,886,413 31,544 12,223,149 (4,330,712) (2,364,215) 71,326,647
Balance at at Dec. 31, 2018 80,518,433 31,548 12,235,341 (4,330,712) (27,909) 72,610,165
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net Income 2,088,873         2,088,873
Other Comprehensive Income, Net Of Tax: 2,817,917       2,817,917  
Stock Issued During Period, Value, Employee Stock Purchase Plan 12,009 5        
Adjustments to Additional Paid in Capital, Share-based Compensation, Employee Stock Purchase Program, Requisite Service Period Recognition     12,004      
Stock Issued During Period, Value, Stock Options Exercised   10        
Adjustments to Additional Paid in Capital, Share-based Compensation, Stock Options, Requisite Service Period Recognition     19,990      
Stock Issued During Period, Value, Conversion of Convertible Securities, Net of Adjustments 20,000          
Cash Dividends on Common Stock (265,982)         265,982
Balance at at Mar. 31, 2019 85,191,250 31,563 12,267,335 (4,330,712) 2,790,008 74,433,056
Balance at at Dec. 31, 2018 80,518,433 31,548 12,235,341 (4,330,712) (27,909) 72,610,165
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net Income 6,192,371          
Other Comprehensive Income, Net Of Tax: 6,359,619          
Balance at at Sep. 30, 2019 92,302,006 31,573 12,294,432 (4,330,712) 6,331,710 77,975,003
Balance at at Mar. 31, 2019 85,191,250 31,563 12,267,335 (4,330,712) 2,790,008 74,433,056
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net Income 1,884,031         1,884,031
Other Comprehensive Income, Net Of Tax: 2,312,597       2,312,597  
Stock Issued During Period, Value, Employee Stock Purchase Plan 14,786 6        
Adjustments to Additional Paid in Capital, Share-based Compensation, Employee Stock Purchase Program, Requisite Service Period Recognition     14,780      
Cash Dividends on Common Stock (266,034)         266,034
Balance at at Jun. 30, 2019 89,136,630 31,569 12,282,115 (4,330,712) 5,102,605 76,051,053
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net Income 2,219,467         2,219,467
Other Comprehensive Income, Net Of Tax: 1,229,105       1,229,105  
Stock Issued During Period, Value, Employee Stock Purchase Plan 12,321 4        
Adjustments to Additional Paid in Capital, Share-based Compensation, Employee Stock Purchase Program, Requisite Service Period Recognition     12,317      
Reclass from AOCI to Retained Earnings for stranded tax effect         0 0
Cash Dividends on Common Stock (295,517)         295,517
Balance at at Sep. 30, 2019 $ 92,302,006 $ 31,573 $ 12,294,432 $ (4,330,712) $ 6,331,710 $ 77,975,003