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Equity Investment (Details Textual) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Investment in subsidiary $ 3,000,000    
Equity Method Investment, Ownership Percentage 25.00%    
Income Tax Reconciliation, Tax Credits, Investment $ 180,000 $ 277,500 $ 112,500