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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, 2009 $ 17,460,454 $ 1,842,842 $ 19,191,606 $ 1,593,327 $ 23,178,944 $ (3,461,731) $ 59,805,442
Net loss         (430,624)   (430,624)
Other comprehensive loss       (405,081)     (405,081)
Grant of stock options     520,457       520,457
Exercise stock options 20,348   (20,348)        
Sale of treasury stock     123,814     314,460 438,274
Stock dividends 874,276 92,002 (125,537)   (840,741)    
Conversion Class C to Class A 2,812 (2,813) 1        
Balance at Dec. 31, 2010 18,357,890 1,932,031 19,689,993 1,188,246 21,907,579 (3,147,271) 59,928,468
Net loss         1,298,758   1,298,758
Other comprehensive loss       (533,803)     (533,803)
Grant of stock options     253,934       253,934
Sale of treasury stock     (101,206)     384,436 283,230
Stock dividends 918,336 96,535 (355,157)   (659,714)    
Conversion Class C to Class A 1,370 (1,371) 1        
Balance at Dec. 31, 2011 19,277,596 2,027,195 19,487,565 654,443 22,546,623 (2,762,835) 61,230,587
Net loss         16,712,518   16,712,518
Other comprehensive loss       1,279,916     1,279,916
Grant of stock options     251,031       251,031
Exercise stock options 1,371,506 63,782 (1,416,982)       18,306
Sale of treasury stock     (62,650)     382,401 319,751
Stock dividends 1,037,404 104,488 3,003,177   (4,145,069)    
Conversion Class C to Class A 646 (645) (1)        
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