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Accounts Receivable (Details) (USD $)	3 Months Ended
Accounts Receivable (Details) (USD $)	Mar. 31, 2013	Mar. 31, 2012
Changes in allowance for doubtful accounts
Beginning balance	$ 39,018	$ 22,292
Bad debt expense	11,980	11,751
Uncollectible accounts written off	0	(5,908)
Ending balance	$ 50,988	$ 28,135

Amount of the current period expense charged against operations, the offset which is generally to the allowance for doubtful accounts for the purpose of reducing receivables, including notes receivable, to an amount that approximates their net realizable value (the amount expected to be collected).

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