Note 5 - Goodwill and Intangible Assets (Details) - Goodwill (USD $) In Thousands, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 30, 2013	Dec. 31, 2012
Goodwill [Abstract]
Balance at beginning of period	$ 370,143	$ 300,260
Goodwill acquired during the period		60,374
Adjustments to prior year acquisitions	(486)	7,109
Effect of foreign currency translation	(10,046)	2,400
Balance at end of period	$ 359,611	$ 370,143