Significant Customer Concentration (Tables)

6 Months Ended

Jun. 30, 2013

Significant Customer Concentration [Abstract]

Significant customer concentration

Significant Customer Concentration:

	Three Months Ended June 30,		Six Months Ended June 30,
	2013	2012	2013	2012
Customer A	11%	9%	11%	7%
Customer B	12%	11%	9%	8%