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Liquidity and Management's Plans (Details) (USD $)
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2012
Dec. 31, 2011
Liquidity and management's plans [Abstract]        
Cash and cash equivalents $ 4,193,583 $ 6,754,485 $ 2,654,694 $ 4,112,326
Total current assets 21,527,689 18,088,791    
Total current liabilities $ 6,140,679 $ 5,070,772