Schedule II- Valuation and Qualifying Accounts (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Allowance for doubtful accounts [Member]
VALUATION AND QUALIFYING ACCOUNTS
Balance at Beginning of Period	$ 450,000	$ 200,000	$ 200,000
Charged to Costs and Expenses	(242,230)	296,366	48,903
Deductions	(7,770)	(46,366)	(48,903)
Balance at End of Period	200,000	450,000	200,000
Allowance for excess and obsolete inventory [Member]
VALUATION AND QUALIFYING ACCOUNTS
Balance at Beginning of Period	4,430,872	350,664	474,074
Charged to Costs and Expenses	553,701	4,610,197	1,278,284
Charged to Other Accounts			(129,900)
Deductions	(2,664,951)	(529,989)	(1,271,794)
Balance at End of Period	2,319,622	4,430,872	350,664
Warranty reserve [Member]
VALUATION AND QUALIFYING ACCOUNTS
Balance at Beginning of Period	427,459	646,113	369,311
Charged to Costs and Expenses	526,563	309,779	843,268
Deductions	(470,301)	(528,433)	(566,466)
Balance at End of Period	$ 483,721	$ 427,459	$ 646,113