Schedule II - Valuation And Qualifying Accounts (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Allowance for Doubtful Accounts
Valuation and Qualifying Accounts
Balance at Beginning of Period	$ 5,231	$ 75,160	$ 52,213
Additions	11,711	13,348	72,877
(Deductions)	(5,864)	(83,277)	(49,930)
Balance at End of Period	11,078	5,231	75,160
Inventory Reserve
Valuation and Qualifying Accounts
Balance at Beginning of Period	563,815	10,662	27,274
Additions	5,330,198	564,451	59,581
(Deductions)	(2,424,566)	(11,298)	(76,193)
Balance at End of Period	3,469,447	563,815	10,662
Deferred Tax Asset Valuation Allowance
Valuation and Qualifying Accounts
Balance at Beginning of Period	72,634,000	69,014,000	69,307,000
Additions		3,620,000
(Deductions)	(21,140,000)		(293,000)
Balance at End of Period	$ 51,494,000	$ 72,634,000	$ 69,014,000