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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
Other comprehensive income (loss)       312,174     312,174
Grant of stock options     168,478       168,478
Exercise of stock options 56,920   4,367       61,287
Sale of treasury stock     274,184     374,472 648,656
Net earnings         7,554,947   7,554,947
Stock Dividends 274 12,768 30,779   (43,821)    
Conversion Class C to Class A 8 (8)          
Balance at Jun. 30, 2016 26,275,402 3,432,040 30,710,390 (187,184) 68,036,530 (1,804,957) 126,462,221
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
Other comprehensive income (loss)       (22,609)     (22,609)
Grant of stock options     203,312       203,312
Exercise of stock options 2 206,804 (206,806)        
Sale of treasury stock     373,385     351,157 724,542
Purchase of treasury stock           (185,470) (185,470)
Net earnings         4,345,864   4,345,864
Stock Dividends 930 4 2,350   (3,284)    
Conversion Class C to Class A 1,214 (1,214)          
Balance at Jun. 30, 2017 $ 27,640,158 $ 4,010,052 $ 35,185,487 $ 242,213 $ 71,751,784 $ (1,204,924) $ 137,624,770