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Consolidated Statements of Shareholders' Equity - USD ($)
Total
Common Stock [Member]
Class A Common Stock [Member]
Common Stock [Member]
Class B Common Stock [Member]
Additional Paid In Capital [Member]
Treasury Stock [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Noncontrolling Interest [Member]
Beginning balance at Dec. 31, 2017 $ 286,166,200 $ 15,223 $ 16,662 $ 147,987,332 $ (16,667,085) $ 154,389,494 $ 424,574  
Beginning Balance, shares at Dec. 31, 2017   15,222,738 16,662,743   (3,032,740)      
Change in accounting principle           3,654 (3,654)  
Issuance of common stock 29,888 $ 4   29,884        
Issuance of common stock, shares   4,461            
Stock-based compensation 1,945,669 $ 107   1,945,562        
Stock-based compensation, shares   107,137            
Adjustment from related party acquisition 474     474        
Purchase of treasury stock (13,780,512)       $ (13,780,512)      
Purchase of treasury stock, shares         (1,393,287)      
Net income 6,481,049         6,481,049    
Cash dividends, $0.20 per common share (5,475,642)         (5,475,642)    
Other comprehensive loss (333,035)           (333,035)  
Ending balance at Dec. 31, 2018 275,034,091 $ 15,334 $ 16,662 149,963,252 $ (30,447,597) 155,398,555 87,885  
Ending Balance, shares at Dec. 31, 2018   15,334,336 16,662,743   (4,426,027)      
Change in accounting principle (935,916)         (935,916)    
Issuance of common stock 1,172,625 $ 285   1,172,340        
Issuance of common stock, shares   285,296            
Stock-based compensation 2,118,718 $ 185   2,118,533        
Stock-based compensation, shares   185,800            
Adjustment from related party acquisition 474     474        
Purchase of treasury stock $ (214,735)       $ (214,735)      
Purchase of treasury stock, shares (67,154)       (67,154)      
Net income $ 13,383,642         13,450,224   $ (66,582)
Cash dividends, $0.20 per common share (5,562,718)         (5,562,718)    
Other comprehensive loss (524,223)           (524,223)  
Ending balance at Dec. 31, 2019 $ 284,471,958 $ 15,804 $ 16,662 $ 153,254,599 $ (30,662,332) $ 162,350,145 $ (436,338) $ (66,582)
Ending Balance, shares at Dec. 31, 2019   15,805,432 16,662,743   (4,493,181)