Note 7 - Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Gross carrying amount	$ 218,850	$ 221,095
Accumulated amortization	(110,953)	(101,399)
Net carrying amount	$ 107,897	119,696
Licensing Agreements [Member]
Weighted average useful lives (Year)	1 year
Gross carrying amount	$ 3,894	3,894
Accumulated amortization	(3,801)	(3,716)
Net carrying amount	$ 93	178
Lease Agreements [Member]
Weighted average useful lives (Year)	1 year 3 months 18 days
Gross carrying amount	$ 864	864
Accumulated amortization	(755)	(689)
Net carrying amount	$ 109	175
Trademarks [Member]
Weighted average useful lives (Year)	9 years 9 months 18 days
Gross carrying amount	$ 15,657	15,751
Accumulated amortization	(6,699)	(6,202)
Net carrying amount	$ 8,958	9,549
Noncompete Agreements [Member]
Weighted average useful lives (Year)	3 years 8 months 12 days
Gross carrying amount	$ 2,434	2,529
Accumulated amortization	(1,422)	(1,229)
Net carrying amount	$ 1,012	1,300
Customer Relationships [Member]
Weighted average useful lives (Year)	7 years 9 months 18 days
Gross carrying amount	$ 157,342	159,719
Accumulated amortization	(74,122)	(66,753)
Net carrying amount	$ 83,220	92,966
Patents [Member]
Weighted average useful lives (Year)	8 years
Gross carrying amount	$ 38,660	38,338
Accumulated amortization	(24,154)	(22,810)
Net carrying amount	$ 14,505	$ 15,528