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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]
Beginning Balance at Dec. 31, 2015 $ 133,537,075 $ 9,450 $ 16,662 $ 119,495,619 $ (15,361,869) $ 29,302,054 $ 75,159
Beginning Balance, shares at Dec. 31, 2015   9,449,956 16,662,743   (2,882,179)    
Issuance of common stock 26,030,366 $ 5,423   26,024,943      
Issuance of common stock, shares   5,422,993          
Stock-based compensation 809,371 $ 240   809,131      
Stock-based compensation, shares   239,580          
Adjustment from related party acquisition 10,232     10,232      
Purchase of treasury stock (198,152)       $ (198,152)    
Purchase of treasury stock, shares         (55,808)    
Net income 47,488,413         47,488,413  
Cash dividends, $0.18 per common share (4,388,701)         (4,388,701)  
Other comprehensive loss (796,981)           (796,981)
Ending Balance at Dec. 31, 2016 202,491,623 $ 15,113 $ 16,662 146,339,925 $ (15,560,021) 72,401,766 (721,822)
Ending Balance, shares at Dec. 31, 2016   15,112,529 16,662,743   (2,937,987)    
Stock-based compensation 1,745,134 $ 110   1,745,024      
Stock-based compensation, shares   110,209          
Adjustment from related party acquisition (97,617)     (97,617)      
Purchase of treasury stock $ (1,107,064)       $ (1,107,064)    
Purchase of treasury stock, shares (94,753)       (94,753)    
Net income $ 87,131,169         87,131,169  
Cash dividends, $0.18 per common share (5,143,441)         (5,143,441)  
Other comprehensive loss 1,146,396           1,146,396
Ending Balance at Dec. 31, 2017 $ 286,166,200 $ 15,223 $ 16,662 $ 147,987,332 $ (16,667,085) $ 154,389,494 $ 424,574
Ending Balance, shares at Dec. 31, 2017   15,222,738 16,662,743   (3,032,740)