Sale of Certain Accounts Receivable (Details Textual) (USD $)	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Accounts receivable factoring, retained amount, Percentage	20.00%
Accounts receivable factoring, fee for first thirty days, Percentage	1.00%
Accounts receivable factoring, additional fee on average daily balance of net outstanding funds, prime rate, Percentage	3.25%	3.25%
Accounts receivable factoring agreement non recourse receivables	$ 2,000,000
Accounts receivable factoring agreement non recourse receivables, sublimit for single customer receivable	1,500,000
Proceeds from Sale of Finance Receivables	3,898,000	4,114,000
Trade Receivables Held-for-sale, Amount	867,000	1,003,000
Accounts receivable sold outstanding balance	267,000	300,000
Receivable from purchaser net of fees and advances	163,436	187,865
Interest expense financing receivable fee	$ 88,300	$ 85,500