Schedule II - Valuation and Qualifying Accounts: (Details 1) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Balance at beginning of year	$ 384,000	$ 376,000
Charged to expenses	252,000	8,000
Obsolete inventory written off	251,654	8,032
Balance at end of year	$ 636,000	$ 384,000