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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, 2012 $ 21,687,152 $ 2,194,820 $ 21,262,140 $ 1,934,359 $ 35,114,072 $ (2,380,434) $ 79,812,109
Net earnings         7,585,921   7,585,921
Other comprehensive loss       (715,963)     (715,963)
Grant of stock options     88,369       88,369
Exercise stock options 719,572 422,422 (345,845)     (543,334) 252,815
Sale of treasury stock     428,794     299,143 727,937
Stock dividends 1,124,304 126,685 1,782,418   (3,033,406)   1
Conversion Class C to Class A 83,546 (83,545) (1)        
Balance at Dec. 31, 2013 23,614,574 2,660,382 23,215,875 1,218,396 39,666,587 (2,624,625) 87,751,189
Net earnings         7,754,648   7,754,648
Other comprehensive loss       220,170     220,170
Grant of stock options     391,220       391,220
Reverse stock split true up   30     (30)    
Exercise stock options 108,824   (34,800)       74,024
Sale of treasury stock     361,679     538,171 899,850
Stock dividends 1,190,040 132,767 1,997,147   (3,319,954)    
Conversion Class C to Class A 5,042 (5,041) (2)   1    
Balance at Dec. 31, 2014 24,918,480 2,788,138 25,931,119 1,438,566 44,101,252 (2,086,454) 97,091,101
Net earnings         12,622,880   12,622,880
Other comprehensive loss       95,262     95,262
Grant of stock options     387,608       387,608
Exercise stock options 47,922 483,304 (55,717)     (441,832) 33,677
Sale of treasury stock     666,840     530,396 1,197,236
Purchase of treasury stock           (181,539) (181,539)
Stock dividends 1,248,966 150,670 3,302,732   (4,702,368)    
Conversion Class C to Class A 2,832 (2,832)          
Balance at Dec. 31, 2015 $ 26,218,200 $ 3,419,280 $ 30,232,582 $ 1,533,828 $ 52,021,764 $ (2,179,429) $ 111,246,225