Note 8 - Geographic Information (Details) - Revenues by Geographic Area (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Revenues:
Revenues	$ 219,677	$ 214,831	$ 645,676	$ 634,498
United States [Member]
Revenues:
Revenues	91,902	84,800	272,562	255,830
United Kingdom [Member]
Revenues:
Revenues	21,704	19,493	57,690	52,267
Not Connected to a Country [Member]
Revenues:
Revenues	99,317	103,151	293,955	303,687
Other Countries [Member]
Revenues:
Revenues	$ 6,754	$ 7,387	$ 21,469	$ 22,714