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Shareholders' Equity (Details 2) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Number of Shares Subject to Option, Balance 1,269,649 1,734,199 2,011,180  
Number of Shares Subject to Option, Granted   0 176,000  
Number of Shares Subject to Option, Cancelled (151,750) (379,550) (452,981)  
Number of Shares Subject to Option, Exercised 0 (85,000) 0  
Number of Shares Subject to Option, Balance 1,117,899 1,269,649 1,734,199 2,011,180
Weighted Average Exercise Price, Balance $ 9.48 $ 11.64 $ 13.82  
Weighted Average Exercise Price, Granted   $ 0 $ 3.69  
Weighted Average Exercise Price, Cancelled $ 12.76 $ 20.43 $ 18.9  
Weighted Average Exercise Price, Exercised $ 0 $ 3.72 $ 0  
Weighted Average Exercise Price, Balance $ 9.03 $ 9.48 $ 11.64 $ 13.82
Weighted Average Remaining Contractual Term (Years) 3 years 8 months 12 days 4 years 2 months 12 days 4 years 3 months 18 days 3 years 10 months 24 days
Aggregate Intrinsic Value $ 4,250 $ 0 $ 281,600 $ 0