Note 9 - Goodwill and Other Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Amortizable intangible assets, gross carrying amount	$ 89,883	$ 88,351
Amortizable intangible assets, accumulated amortization	37,137	28,966
Customer Relationships [Member]
Amortizable intangible assets, gross carrying amount	44,557	44,557
Amortizable intangible assets, accumulated amortization	19,225	15,790
Customer Contracts [Member]
Amortizable intangible assets, gross carrying amount	1,064	1,064
Amortizable intangible assets, accumulated amortization	709	355
Patents [Member]
Amortizable intangible assets, gross carrying amount	20,056	20,024
Amortizable intangible assets, accumulated amortization	8,418	6,521
Technology-Based Intangible Assets [Member]
Amortizable intangible assets, gross carrying amount	10,111	10,111
Amortizable intangible assets, accumulated amortization	4,064	3,052
Noncompete Agreements [Member]
Amortizable intangible assets, gross carrying amount	4,358	4,358
Amortizable intangible assets, accumulated amortization	2,216	1,565
Trademarks [Member]
Amortizable intangible assets, gross carrying amount	9,737	8,237
Amortizable intangible assets, accumulated amortization	$ 2,505	$ 1,683