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Deferred Revenue (Details Textual) (USD $)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2004
Dec. 31, 2012
Jul. 31, 2004
Proceeds from Related Party Debt         $ 4,000,000    
Business Acquisition, Purchase Price Allocation, Property             4,000,000
Deferred Revenue 1,699,093   1,699,093     1,930,783 4,000,000
Minimum Lease Rental Years         3.7 years    
Operating Leases, Income Statement, Minimum Lease Revenue $ 10,261,931 $ 7,985,347 $ 19,897,794 $ 15,802,406 $ 1,700,000