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(2) Share-Based Payment Arrangements (Details 2) (USD $)
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Notes to Financial Statements    
Number of Options Outstanding, Beginning 11,360,842  
Number of Options Granted 70,000  
Number of Options Exercised 310,000  
Number of Options Forfeited 224,795  
Number of Options Expired 20,000  
Number of Options Outstanding, Ending 10,876,047  
Number of Options Exercisable 7,567,615  
Weighted Average Exercise Price Outstanding, Beginning $ 4.66  
Weighted Average Exercise Price Granted $ 2.31  
Weighted Average Exercise Price Exercised $ 2.25  
Weighted Average Exercise Price Forfeited $ 4.56  
Weighted Average Exercise Price Expired $ 3.96  
Weighted Average Exercise Price Outstanding, Ending $ 4.72  
Weighted Average Exercise Price Exercisable $ 5.52  
Weighted Average Remaining Contractual Life (in years) Outstanding 6 years 1 month 17 days  
Weighted Average Remaining Contractual Life (in years) Exercisable 5 years 2 months 1 day  
Aggregate Intrinsic Value Exercised $ 121,819 $ 78,253
Aggregate Intrinsic Value Outstanding, Ending 1,136,141  
Aggregate Intrinsic Value Exercisable $ 340,020