Short-Term Borrowings (Details Textual) (Financing and Security Agreement [Member], USD $)	12 Months Ended
	Dec. 31, 2012
Line of Credit Facility, Maximum Borrowing Capacity	$ 50,000,000
Line of Credit Facility, Expiration Date 1	Oct. 31, 2014
Line of Credit Facility Provision to Increase Borrowing Capacity	75,000,000
Line of Credit Facility, Current Borrowing Capacity	$ 50,000,000
Maximum [Member]
Line of Credit Facility, Interest Rate Description	LIBOR market index rate plus 2.25%