Product Warranty (Details Textual) (USD $) In Thousands, unless otherwise specified			6 Months Ended
	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2012 Minimum [Member]	Jun. 30, 2012 Maximum [Member]
Product Warranty (Textual) [Abstract]
Accrued product warranty costs	$ 924	$ 933
Limited warranty period on product			1 year	4 years