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Accounts Receivable (Details) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Changes in allowance for doubtful accounts        
Beginning balance $ 50,998 $ 28,135 $ 39,018 $ 22,292
Bad debt expense 8,051 (5,783) 20,031 5,968
Uncollectible accounts written off       (5,908)
Ending balance $ 59,049 $ 22,352 $ 59,049 $ 22,352