Lease Obligations and Other Contingencies (Details Textual) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Lease Obligations and Other Contingencies (Textual) [Abstract]
Rent expense for operating lease	$ 629	$ 714	$ 771
Building at North Carolina [Member]
Lease Obligations and Other Contingencies (Textual) [Abstract]
Expiry date of building lease in Alabama	Dec. 31, 2014
Building at Alabama [Member]
Lease Obligations and Other Contingencies (Textual) [Abstract]
Lease Extension Period	5 years
Expiry date of building lease in Alabama	Jun. 30, 2015