(16) Valuation and Qualifying Accounts Allowance for Returns and Doubtful Accounts (Tables)

12 Months Ended

Dec. 31, 2012

Valuation and Qualifying Accounts [Abstract]

Schedule of valuation accounts

	Balance at	Additions charged		Balance at
	Beginning of	to Expenses /		End of
Period Ended	Period	Revenues	Deductions	Period
December 31, 2012	$            1,723,679	$               357,301	$            1,140,879	$               940,101
December 31, 2011	$            3,242,458	$               120,992	$            1,639,771	$            1,723,679
December 31, 2010	$            7,503,338	$            1,211,838	$            5,472,718	$            3,242,458