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Consolidated Balance Sheets [Parenthetical] (USD $)
Jun. 30, 2011
Dec. 31, 2010
Preferred stock, no par or stated value (in dollars per share) $ 0 $ 0
Preferred stock, shares authorized 10,000,000 10,000,000
Preferred stock, shares outstanding 0 0
Common stock, no par or stated value (in dollars per share) $ 0 $ 0
Common stock, shares authorized 10,000,000 10,000,000
Common stock, shares issued 2,888,902 2,888,902
Common stock, shares outstanding 2,830,978 2,826,796
Treasury stock, shares 57,924 62,106