Exhibit 4

Following is a schedule of sales of the Issuer’s Class A Common Stock by
the Reporting Persons during the past 60 days. All of these sales were
open market transactions on the NASDAQ Global Market.

Date of Sale	Number of Shares Sold		Share Price
11/18/2010		25714	$	2.620
11/19/2010		3300	$	2.600
11/22/2010		3610	$	2.570
11/23/2010		8485	$	2.530
11/24/2010		3000	$	2.570
11/26/2010		3300	$	2.530
11/29/2010		21,000	$	2.610
12/7/2010		400	$	2.600
12/10/2010		2,100	$	2.600
12/13/2010		4,200	$	2.600
12/14/2010		136	$	2.600
12/20/2010		4,274	$	2.510
12/21/2010		1,665	$	2.510
12/22/2010		3,700	$	2.500
12/28/2010		3,800	$	2.500
12/29/2010		6,200	$	2.500
12/30/2010		2,050	$	2.507
12/31/2010		3,600	$	2.510
1/3/2011		4,300	$	2.520
1/4/2011		500	$	2.500
1/5/2011		500	$	2.500
1/6/2011		14,900	$	2.532
1/7/2011		10,900	$	2.610
1/10/2011		13,253	$	2.770
1/11/2011		9,754	$	2.780
1/12/2011		6,944	$	2.770
1/13/2011		3,500	$	2.780
1/14/2011		3,400	$	2.640
1/18/2011		7,986	$	2.710