Schedule II - Valuation and Qualifying Accounts (Details) (Allowance for Doubtful Accounts [Member], USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Allowance for Doubtful Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at January 1	$ 25,000	$ 75,000	$ 8,980
(Deductions from)/charges to costs and expenses	0	0	75,000
Deductions from reserves	0	(50,000)	(8,980)
Balance at December 31	$ 25,000	$ 25,000	$ 75,000