Note 10 - Summary of Changes in Goodwill (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Goodwill, gross	$ 521,832,000	$ 472,986,000	$ 283,005,000
Goodwill	48,916,000	189,981,000
Goodwill	(70,000)	0
Accumulated goodwill impairment	(98,596,000)	(98,596,000)	(98,596,000)
Goodwill	423,236,000	374,390,000	184,409,000
Accumulated goodwill impairment	$ (98,596,000)	$ (98,596,000)	$ (98,596,000)