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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         6,099,002   6,099,002
Other comprehensive loss       (621,887)     (621,887)
Grant of stock options     66,711       66,711
Exercise of stock options 714,572 422,422 (344,545)     (543,334) 249,115
Sale of treasury stock     321,824     195,120 516,944
Stock Dividends (200)   (526)   726    
Conversion Class C to Class A 83,246 (83,245) (1)        
Balance at Sep. 30, 2013 22,484,770 2,533,997 21,305,603 1,312,472 41,213,800 (2,728,648) 86,121,994
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 loss       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