SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Allowance for Doubtful Accounts
Valuation and Qualifying Accounts
Balance at Beginning of Period	$ 75,160	$ 52,213	$ 37,392
Additions	13,348	72,877	40,714
(Deductions)	(83,277)	(49,930)	(25,893)
Balance at End of Period	5,231	75,160	52,213
Inventory Reserve
Valuation and Qualifying Accounts
Balance at Beginning of Period	10,662	27,274	35,009
Additions	564,451	59,581	19,701
(Deductions)	(11,298)	(76,193)	(27,435)
Balance at End of Period	563,815	10,662	27,274
Deferred Tax Asset Valuation Allowance
Valuation and Qualifying Accounts
Balance at Beginning of Period	69,014,000	69,307,000	56,272,000
Additions	3,620,000		13,035,000
(Deductions)		(293,000)
Balance at End of Period	$ 72,634,000	$ 69,014,000	$ 69,307,000