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Income Taxes (Details Textual) (USD $)
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Income Taxes (Textual) [Abstract]        
Retained earnings related to tax bad debt deductions $ 2,931,503      
Gross unrecognized tax benefits 0 221,000 340,351 562,076
Accrued interest $ 30,969 $ 28,000 $ 31,000