Note 9 - Goodwill and Intangible Assets - Summary of Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Finite-lived intangible assets, gross	$ 653,682	$ 573,795
Finite-lived intangible assets, accumulated amortization	(484,269)	(455,626)
Finite-lived intangible assets, net	169,413	118,169
Indefinite-lived tradenames, gross	128,321	128,321
Total intangible assets, gross	782,003	702,116
Total intangible assets, net	$ 297,734	246,490
Trade Names [Member]
Finite-lived intangible assets, useful life (Year)	9 years
Finite-lived intangible assets, gross	$ 56,669	56,378
Finite-lived intangible assets, accumulated amortization	(36,613)	(32,416)
Finite-lived intangible assets, net	$ 20,056	23,962
Customer Lists [Member]
Finite-lived intangible assets, useful life (Year)	12 years
Finite-lived intangible assets, gross	$ 369,932	368,343
Finite-lived intangible assets, accumulated amortization	(314,380)	(307,149)
Finite-lived intangible assets, net	$ 55,552	61,194
Patents [Member]
Finite-lived intangible assets, useful life (Year)	13 years
Finite-lived intangible assets, gross	$ 131,086	131,030
Finite-lived intangible assets, accumulated amortization	(110,554)	(101,060)
Finite-lived intangible assets, net	$ 20,532	29,970
Developed Technology Rights [Member]
Finite-lived intangible assets, useful life (Year)	9 years
Finite-lived intangible assets, gross	$ 82,886	13,169
Finite-lived intangible assets, accumulated amortization	(17,872)	(12,058)
Finite-lived intangible assets, net	65,014	1,111
Computer Software, Intangible Asset [Member]
Finite-lived intangible assets, gross	1,046	1,046
Finite-lived intangible assets, accumulated amortization	(1,046)	(1,046)
Finite-lived intangible assets, net	$ 0	0
Noncompete Agreements [Member]
Finite-lived intangible assets, useful life (Year)	4 years
Finite-lived intangible assets, gross	$ 12,063	3,829
Finite-lived intangible assets, accumulated amortization	(3,804)	(1,897)
Finite-lived intangible assets, net	$ 8,259	$ 1,932