Consolidated Balance Sheets (Parenthetical) (USD $)	Dec. 31, 2011	Dec. 31, 2010
Treasury stock, common shares	352,161	476,227
Common Stock
Common stock, par value	1	1
Common stock, shares authorized	50,000,000	50,000,000
Common stock, shares issued	18,605,993	17,801,273
Common stock, shares outstanding	18,253,832	17,325,046
Common Class B
Common stock, par value	1	1
Class B common stock, shares authorized	1,500,000	1,500,000
Class B common stock, shares issued	1,050,012	1,050,012
Class B common stock, shares outstanding	1,050,012	1,050,012