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Financial Instruments (Details) (USD $)
Dec. 31, 2012
Dec. 31, 2011
Financial Instruments (Textual) [Abstract]    
Percentage of fixed rate of interest carrying amount of notes receivables 6.00%  
Carrying amount of notes receivable from related parties $ 2,656,067 $ 2,939,655
Fair value of notes receivable 2,900,000 3,400,000
Long-term debt $ 116,750,000 $ 126,733,619