Note 8 - Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Gross carrying amount	$ 155,891	$ 155,155
Accumulated amortization	(97,022)	(87,280)
Net carrying amount	58,869	67,875
Licensing Agreements [Member]
Gross carrying amount	3,894	3,894
Accumulated amortization	(3,894)	(3,824)
Net carrying amount	0	70
Lease Agreements [Member]
Gross carrying amount	864	864
Accumulated amortization	(864)	(777)
Net carrying amount	0	87
Trademarks [Member]
Gross carrying amount	14,758	14,688
Accumulated amortization	(7,459)	(6,695)
Net carrying amount	$ 7,299	7,993
Weighted average useful lives (Year)	8 years 4 months 24 days
Noncompete Agreements [Member]
Gross carrying amount	$ 1,561	1,556
Accumulated amortization	(1,008)	(784)
Net carrying amount	$ 553	772
Weighted average useful lives (Year)	2 years 3 months 18 days
Customer Relationships [Member]
Gross carrying amount	$ 95,058	94,865
Accumulated amortization	(56,602)	(50,104)
Net carrying amount	$ 38,456	44,761
Weighted average useful lives (Year)	5 years 8 months 12 days
Patents [Member]
Gross carrying amount	$ 39,756	39,288
Accumulated amortization	(27,195)	(25,096)
Net carrying amount	$ 12,561	$ 14,192
Weighted average useful lives (Year)	6 years 10 months 24 days