Note 6 - Intangible Assets - Summary of Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Gross Carrying Amount	$ 194,999	$ 197,499
Accumulated Amortization	(127,859)	(106,017)
Net Carrying Amount	67,140	91,482
Customer Relationships [Member]
Gross Carrying Amount	156,790	159,290
Accumulated Amortization	(104,740)	(89,106)
Net Carrying Amount	$ 52,050	$ 70,184
Intangible assets, estimated useful life (Year)	12 years 292 days	11 years 109 days
Trade Names [Member]
Gross Carrying Amount	$ 16,246	$ 16,246
Accumulated Amortization	(16,215)	(13,916)
Net Carrying Amount	$ 31	$ 2,330
Intangible assets, estimated useful life (Year)	255 days	1 year
Intellectual Property [Member]
Gross Carrying Amount	$ 21,700	$ 21,700
Accumulated Amortization	(6,670)	(2,874)
Net Carrying Amount	$ 15,030	$ 18,826
Intangible assets, estimated useful life (Year)	4 years 36 days	5 years 73 days
Restrictive Covenant [Member]
Gross Carrying Amount	$ 263	$ 263
Accumulated Amortization	(234)	(121)
Net Carrying Amount	$ 29	$ 142
Intangible assets, estimated useful life (Year)	255 days	1 year 109 days