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Consolidated Balance Sheets (Parenthetical) (USD $)
Dec. 31, 2012
Dec. 31, 2011
Common stock, par value $ 1 $ 1
Common stock, shares authorized 50,000,000 50,000,000
Common stock, shares issued 20,343,327 18,082,822
Common stock, shares outstanding 20,053,406 17,849,376
Undesignated Par Value
    
Preferred stock      
Preferred stock, shares authorized 1,000,000 1,000,000
Preferred stock, shares issued      
Preferred stock, shares outstanding      
Designated Par Value
    
Preferred stock, par value $ 0.01 $ 0.01
Preferred stock, shares authorized 25,000 25,000
Preferred stock, shares issued 17,421 18,921