Valuation and Qualifying Accounts Allowance for Returns and Doubtful Accounts (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance at Beginning of Period	$ 940,101	$ 1,723,679	$ 3,242,458
Charges (Benefits) to Expenses / Revenues	(294,074)	357,301	120,992
Deductions	369,725	1,140,879	1,639,771
Balance at End of Period	$ 276,302	$ 940,101	$ 1,723,679