Note 4 - Intangible Assets and Goodwill - Summary of Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Gross Carrying Amount	$ 90,259	$ 194,999
Accumulated Amortization	(25,458)	(127,859)
Net Carrying Amount	64,801	67,140
Customer Relationships [Member]
Gross Carrying Amount	68,290	156,790
Accumulated Amortization	(17,588)	(104,740)
Net Carrying Amount	$ 50,702	$ 52,050
Useful life (Year)	12 years 255 days	12 years 292 days
Intellectual Property [Member]
Gross Carrying Amount	$ 21,700	$ 21,700
Accumulated Amortization	(7,638)	(6,670)
Net Carrying Amount	$ 14,062	$ 15,030
Useful life (Year)	3 years 328 days	4 years 36 days
Trade Names [Member]
Gross Carrying Amount	$ 136	$ 16,246
Accumulated Amortization	(117)	(16,215)
Net Carrying Amount	$ 19	$ 31
Useful life (Year)	146 days	255 days
Restrictive Covenant [Member]
Gross Carrying Amount	$ 133	$ 263
Accumulated Amortization	(115)	(234)
Net Carrying Amount	$ 18	$ 29
Useful life (Year)	146 days	255 days