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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, 2013 $ 23,614,574 $ 2,660,382 $ 23,215,875 $ 1,218,396 $ 39,666,587 $ (2,624,625) $ 87,751,189
Net earnings         4,900,733   4,900,733
Other comprehensive income       257,903     257,903
Grant of stock options     237,398       237,398
Reverse stock split true up   30     (30)    
Exercise of stock options 80,936   (22,864)       58,072
Sale of treasury stock     240,501     395,994 636,495
Stock Dividends 3,446 (1) 4,910   (8,355)    
Conversion Class C to Class A 2,772 (2,771) (2)       (1)
Balance at Sep. 30, 2014 23,701,728 2,657,640 23,675,818 1,476,299 44,558,935 (2,228,631) 93,841,789
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         10,605,767   10,605,767
Other comprehensive income       413,315     413,315
Grant of stock options     299,986       299,986
Exercise of stock options 41,862 228,046 (1,208)     (244,009) 24,691
Sale of treasury stock     489,746     380,956 870,702
Stock Dividends 480 2 728   (1,210)    
Conversion Class C to Class A 1,256 (1,256)          
Balance at Sep. 30, 2015 $ 24,962,078 $ 3,014,930 $ 26,720,371 $ 1,851,881 $ 54,705,809 $ (1,949,507) $ 109,305,562