Concentration of Credit Risk (Details Textual) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Accounts Receivable, Net, Current	$ 10,856,049		$ 11,286,797
Customer A [Member] | Accounts Receivable [Member]
Concentration Risk, Percentage	28.00%	35.90%
Accounts Receivable, Net, Current	3,036,000	3,318,000
Customer B [Member] | Accounts Receivable [Member]
Concentration Risk, Percentage	16.30%	17.90%
Accounts Receivable, Net, Current	$ 1,769,000	$ 1,655,000