Note 13 - Segment and Geographical Information (Tables)

12 Months Ended

Dec. 31, 2012

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

Revenues:	For the years ended December 31,
	2010		2011		2012
United States	$	147,918	$	298,056	$	340,200
Canada		9,710		21,271		27,595
United Kingdom		5,883		78,533		131,278
Australia		—		—		22,164
Total	$	163,511	$	397,860	$	521,237

Disclosure on Geographic Areas, Long-Lived Assets

Long-lived assets: (1)	December 31,
	2011		2012
United States	$	340,955		337,831
Canada		42,377		34,919
United Kingdom		96,822		99,140
Australia		—		94,291
Total	$	480,154	$	566,181