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Statements of Stockholders' Equity - USD ($)
Class A Common Stock
Class C Common Stock
Additional Paid-in Capital
Accumulated Other Comprehensive Income (Loss)
Retained Earnings
Treasury Stock
Total
Balance at Dec. 31, 2015 $ 26,218,200 $ 3,419,280 $ 30,232,582 $ (499,358) $ 60,525,404 $ (2,179,429) $ 117,716,679
Net earnings         12,188,627   12,188,627
Other comprehensive income       764,180     764,180
Stock based compensation expense     343,577       343,577
Exercise of stock options 85,268 209,950 (179,112)       116,106
Sale of treasury stock     621,144     808,818 1,429,962
Stock Dividends 1,315,838 193,934 3,795,055   (5,304,827)    
Conversion Class C to Class A 18,706 (18,706)          
Balance at Dec. 31, 2016 27,638,012 3,804,458 34,813,246 264,822 67,409,204 (1,370,611) 132,559,131
Net earnings         14,112,934   14,112,934
Other comprehensive income       338,348     338,348
Stock based compensation expense     395,603       395,603
Exercise of stock options 16,366 206,804 (213,323)       9,847
Sale of treasury stock     712,591     822,270 1,534,861
Purchase of treasury stock           (382,734) (382,734)
Stock Dividends 1,385,270 198,992 2,416,925   (4,001,187)    
Conversion Class C to Class A 31,506 (31,506)          
Balance at Dec. 31, 2017 $ 29,071,154 $ 4,178,748 $ 38,125,042 $ 603,170 $ 77,520,951 $ (931,075) $ 148,567,990