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Stock Warrants (Summary of Warrant Activity) (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Shares  
Balance, end of year 2,146,000
Warrant [Member]
 
Shares  
Balance, beginning of year 2,333,500
Granted   
Exercised   
Expired (187,500)
Balance, end of year 2,146,000
Exercisable at December 31 2,146,000
Weighted Average Exercise Price  
Balance, beginning of year $ 3.47
Granted   
Exercised   
Expired $ 3.5
Balance, end of year $ 3.37
Exercisable at December 31 $ 3.37
Intrinsic Value  
Balance, end of year   
Exercisable at December 31