Note 6 - Intangible Assets and Goodwill - Summary of Intangible Assets (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Gross Carrying Amount	$ 194,999	$ 197,499
Accumulated Amortization	(116,291)	(106,017)
Net Carrying Amount	78,708	91,482
Customer Relationships [Member]
Gross Carrying Amount	156,790	159,290
Accumulated Amortization	(96,249)	(89,106)
Net Carrying Amount	$ 60,541	$ 70,184
Useful life (Year)	11 years 292 days	11 years 109 days
Trade Names [Member]
Gross Carrying Amount	$ 16,246	$ 16,246
Accumulated Amortization	(15,097)	(13,916)
Net Carrying Amount	$ 1,149	$ 2,330
Useful life (Year)	182 days	1 year
Intellectual Property [Member]
Gross Carrying Amount	$ 21,700	$ 21,700
Accumulated Amortization	(4,733)	(2,874)
Net Carrying Amount	$ 16,967	$ 18,826
Useful life (Year)	4 years 182 days	5 years 73 days
Restrictive Covenant [Member]
Gross Carrying Amount	$ 263	$ 263
Accumulated Amortization	(212)	(121)
Net Carrying Amount	$ 51	$ 142
Useful life (Year)	1 year 36 days	1 year 109 days