Note 7 - Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Gross carrying amount	$ 218,612	$ 219,623
Accumulated amortization	(117,228)	(114,795)
Net carrying amount	$ 101,383	104,828
Licensing Agreements [Member]
Weighted average useful lives (Year)	6 months
Gross carrying amount	$ 3,894	3,894
Accumulated amortization	(3,848)	(3,824)
Net carrying amount	$ 46	70
Lease Agreements [Member]
Weighted average useful lives (Year)	9 months 18 days
Gross carrying amount	$ 864	864
Accumulated amortization	(798)	(777)
Net carrying amount	$ 66	87
Trademarks [Member]
Weighted average useful lives (Year)	9 years 6 months
Gross carrying amount	$ 15,690	15,699
Accumulated amortization	(7,069)	(6,911)
Net carrying amount	$ 8,621	8,788
Noncompete Agreements [Member]
Weighted average useful lives (Year)	3 years 1 month 6 days
Gross carrying amount	$ 2,286	2,301
Accumulated amortization	(1,416)	(1,354)
Net carrying amount	$ 870	947
Customer Relationships [Member]
Weighted average useful lives (Year)	7 years
Gross carrying amount	$ 157,241	157,576
Accumulated amortization	(79,264)	(76,832)
Net carrying amount	$ 77,977	80,744
Patents [Member]
Weighted average useful lives (Year)	7 years 6 months
Gross carrying amount	$ 38,637	39,289
Accumulated amortization	(24,833)	(25,097)
Net carrying amount	$ 13,804	$ 14,192