Short-Term Borrowings (Details Textual) (Financing and Security Agreement [Member], USD $)	9 Months Ended
	Sep. 30, 2013
Short-term Debt [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 50,000,000
Line of Credit Facility, Expiration Date 1	Oct. 31, 2015
Line of Credit Facility, Amount Outstanding	4,820,000
Line of Credit Facility, Remaining Borrowing Capacity	45,180,000
Line of Credit Facility Provision to Increase Borrowing Capacity	$ 75,000,000
Maximum [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Interest Rate Description	LIBOR market index rate plus 2.25%
Minimum [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Interest Rate Description	minimum of LIBOR plus 1.0%