Note 6 - Intangible Assets - Identifiable Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Intangible assets, gross	$ 335,251	$ 322,635
Intangible assets, accumulated amortization	166,961	142,188
Intangible assets, net	168,290	180,447
Developed Technology Rights [Member]
Intangible assets, gross	186,800	186,800
Intangible assets, accumulated amortization	123,365	86,378
Intangible assets, net	63,435	100,422
Customer Relationships [Member]
Intangible assets, gross	70,540	70,540
Intangible assets, accumulated amortization	31,409	21,681
Intangible assets, net	39,131	48,859
Trade Names [Member]
Intangible assets, gross	2,310	2,310
Intangible assets, accumulated amortization	1,766	1,350
Intangible assets, net	544	960
Patents [Member]
Intangible assets, gross	1,579	1,579
Intangible assets, accumulated amortization	1,010	881
Intangible assets, net	569	698
Computer Software, Intangible Asset [Member]
Intangible assets, gross	74,022	61,406
Intangible assets, accumulated amortization	9,411	31,898
Intangible assets, net	$ 64,611	$ 29,508