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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, 2010 $ 18,357,890 $ 1,932,031 $ 19,689,993 $ 1,188,246 $ 21,907,579 $ (3,147,271) $ 59,928,468
Net earnings         (313,606)   (313,606)
Other comprehensive income       92,435     92,435
Grant of stock options     128,688       0
Sale of treasury stock     (7,108)     147,343 140,235
Stock dividends 218 2 (29)   (191)    
Conversion Class C to Class A 958 (959) 1        
Balance at Jun. 30, 2011 18,359,066 1,931,074 19,811,545 1,280,681 21,593,782 (2,999,928) 59,976,220
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 earnings         5,255,215   5,255,215
Other comprehensive income       1,940,010     1,940,010
Grant of stock options     94,436       166,810
Sale of treasury stock     (98,025)     256,956 158,931
Balance at Jun. 30, 2012 $ 19,277,596 $ 2,027,195 $ 19,483,976 $ 2,594,453 $ 27,801,838 $ (2,505,879) $ 68,679,179