Exhibit 4

Following is a schedule of sales of the Issuer’s Class A Common Stock by the Reporting Persons that have not previously been reported in this Schedule 13D or Amendment Nos. 1, 2, 3, or 4 thereto. All of these sales were open market transactions on the NASDAQ Global Market.

Date of Sale	Number of Shares Sold		Share Price
2/22/2011		5,696	$	2.7205
2/23/2011		6,100	$	2.7008
2/24/2011		3,016	$	2.7032
2/25/2011		13,100	$	2.7026
2/28/2011		400	$	2.7238
3/1/2011		7,315	$	2.7469
3/2/2011		2,900	$	2.7798
3/3/2011		500	$	2.7240
3/4/2011		2,720	$	2.7277
3/7/2011		4,800	$	2.7180
3/8/2011		4,477	$	2.6800
3/9/2011		9,600	$	2.6157
3/10/2011		7,300	$	2.5775
3/11/2011		12,100	$	2.5529