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Organization and Summary of Significant Accounting Policies (Details) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Recurring [Member]
Dec. 31, 2012
Recurring [Member]
Sep. 30, 2013
Level 1 [Member]
Recurring [Member]
Dec. 31, 2012
Level 1 [Member]
Recurring [Member]
Sep. 30, 2013
Level 2 [Member]
Recurring [Member]
Dec. 31, 2012
Level 2 [Member]
Recurring [Member]
Sep. 30, 2013
Level 3 [Member]
Recurring [Member]
Dec. 31, 2012
Level 3 [Member]
Recurring [Member]
Assets and Liabilities Measured and Recorded at Fair Value on a Recurring Basis [Abstract]                        
Money market funds included in cash and cash equivalents         $ 4,541,200 $ 1,239,500 $ 4,541,200 $ 1,239,500 $ 0 $ 0 $ 0 $ 0
Total         4,541,200 1,239,500 4,541,200 1,239,500 0 0 0 0
Liabilities recorded at fair value         0 0            
Write down of long-lived assets 0 0 0 0                
Finance Leases [Abstract]                        
Interest earned on finance lease $ 37,100 $ 21,800 $ 102,100 $ 67,800