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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         4,832,511   4,832,511
Other comprehensive loss       315,978     315,978
Grant of stock options     62,589       62,589
Exercise of stock options 265,842 422,422 104,185     (543,334) 249,115
Sale of treasury stock     175,956     68,314 244,270
Conversion Class C to Class A 83,246 (83,245) (1)        
Balance at Jun. 30, 2013 22,036,040 2,533,997 21,604,343 2,250,337 39,947,309 (2,855,454) 85,516,572
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         2,762,911   2,762,911
Other comprehensive loss       923,000     923,000
Grant of stock options     128,526       128,526
Exercise of stock options 69,910   (19,611)       50,299
Sale of treasury stock     147,542     243,590 391,132
Stock Dividends 3,446 (1) 4,910   (8,355)    
Conversion Class C to Class A 1,778 (1,776) (2)        
Balance at Jun. 30, 2014 $ 23,689,708 $ 2,658,605 $ 23,477,240 $ 2,141,396 $ 42,421,143 $ (2,381,035) $ 92,007,057