Note 13 - Segment and Geographical Information (Tables)

3 Months Ended

Mar. 31, 2012

Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block]

Revenues:	For the three months ended March 31,
	2011		2012
United States	$	56,858	$	87,195
Canada		4,700		6,886
United Kingdom		5,030		29,657
Total	$	66,588	$	123,738

Disclosure on Geographic Areas, Long-Lived Assets

Long-lived assets: (1)	December 31,		March 31,
	2011		2012
United States	$	340,955	$	336,032
Canada		42,377		40,300
United Kingdom		72,452		72,168
Total	$	455,784	$	448,500