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Consolidated Balance sheets (Parenthetical)
Mar. 31, 2013
Dec. 31, 2012
Preferred stock, shares authorized 10,000,000 10,000,000
Preferred stock, shares outstanding 0 0
Common stock, shares authorized 10,000,000 10,000,000
Common stock, shares issued 2,892,852 2,888,902
Common stock, shares outstanding 2,841,346 2,839,137
Treasury stock, shares 51,506 49,765