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(16) Valuation and Qualifying Accounts Allowance for Returns and Doubtful Accounts (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Valuation and Qualifying Accounts [Abstract]
Balance at Beginning of Period	$ 1,723,679	$ 3,242,458	$ 7,503,338
Additions charged to Expenses / Revenues	357,301	120,992	1,211,838
Deductions	1,140,879	1,639,771	5,472,718
Balance at End of Period	$ 940,101	$ 1,723,679	$ 3,242,458

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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