Note 13 - Segment and Geographical Information (Details) - Revenues by Geographic Area (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Note 13 - Segment and Geographical Information (Details) - Revenues by Geographic Area [Line Items]
Revenues by Country	$ 156,148	$ 127,777	$ 304,851	$ 251,515
United States [Member]
Note 13 - Segment and Geographical Information (Details) - Revenues by Geographic Area [Line Items]
Revenues by Country	95,493	88,462	186,671	175,657
Canada [Member]
Note 13 - Segment and Geographical Information (Details) - Revenues by Geographic Area [Line Items]
Revenues by Country	8,275	7,018	15,696	13,904
United Kingdom [Member]
Note 13 - Segment and Geographical Information (Details) - Revenues by Geographic Area [Line Items]
Revenues by Country	35,274	32,297	69,041	61,954
Australia [Member]
Note 13 - Segment and Geographical Information (Details) - Revenues by Geographic Area [Line Items]
Revenues by Country	$ 17,106		$ 33,443