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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, 2008 $ 16,568,218 $ 1,782,463 $ 17,985,848 $ 417,101 $ 21,023,179 $ (3,864,530) $ 53,912,279
Net earnings (loss)         3,773,880   3,773,880
Unrealized gains (losses)       1,176,226     1,176,226
Total comprehensive income             4,950,106
Grant of stock options     485,986       485,986
Exercise of stock options 32,962   (32,962)        
Sale of treasury stock     54,271     402,799 457,070
Stock dividends 831,736 87,755 698,524   (1,618,015)    
Odd lot purchase 160   (60)   (100)    
Conversion Class C to Class A 27,377 (27,376) (1)        
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 earnings (loss)         (430,624)   (430,624)
Unrealized gains (losses)       (405,081)     (405,081)
Total comprehensive income             (835,705)
Grant of stock options     520,457       520,457
Exercise of 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 earnings (loss)         1,298,758   1,298,758
Unrealized gains (losses)       (533,803)     (533,803)
Total comprehensive income             764,955
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