Valuation and Qualifying Accounts Allowance for Returns and Doubtful Accounts (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance at Beginning of Period	$ 119,530	$ 276,302	$ 940,101
Charges (Benefits) to Expenses / Revenues	(6,745)	(64,904)	(294,074)
Deductions	(78,500)	91,868	369,725
Balance at End of Period	$ 191,285	$ 119,530	$ 276,302