Notes Payable and Credit Arrangements Line of Credit Additional Information (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Line of Credit Facility [Line Items]
Guidence Line, Utilized	$ 675	$ 1,400
Line of Credit Facility, Remaining Borrowing Capacity	549
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Amount Outstanding	449	0
Line of Credit Facility, Interest Rate at Period End	6.00%
Ex-Im Facility [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Amount Outstanding	$ 141	$ 1,200
Line of Credit Facility, Interest Rate at Period End	6.50%