Product Line and Significant Customer Information (Narrative) (Details)	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Segment Reporting [Abstract]
Entity-wide revenue, major customer, percentage	36.00%	35.00%
Total revenue from major customer	10.00%	10.00%
Number of other customers having revenue more than 10%	0	0