Note 8 - Goodwill and Intangible Assets - Summary of Acquired Amortizable Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 197,205	$ 18,328
Accumulated Amortization	(10,000)	(4,460)
Net Carrying Amount	187,205	13,868
Internal-use Software [Member]
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	7,026	7,074
Accumulated Amortization	(2,912)	(1,810)
Net Carrying Amount	$ 4,114	$ 5,264
Internal-use Software [Member] | Minimum [Member]
Finite Lived Intangible Assets [Line Items]
Amortization Period (Year)	3 years	3 years
Internal-use Software [Member] | Maximum [Member]
Finite Lived Intangible Assets [Line Items]
Amortization Period (Year)	7 years	7 years
Technology-based Intangibles [Member]
Finite Lived Intangible Assets [Line Items]
Amortization Period (Year)	20 years	20 years
Gross Carrying Amount	$ 3,481	$ 3,646
Accumulated Amortization	(1,523)	(1,413)
Net Carrying Amount	1,958	2,233
Customer-related Intangibles [Member]
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	186,698	7,608
Accumulated Amortization	(5,565)	(1,237)
Net Carrying Amount	$ 181,133	$ 6,371
Customer-related Intangibles [Member] | Minimum [Member]
Finite Lived Intangible Assets [Line Items]
Amortization Period (Year)	10 years	10 years
Customer-related Intangibles [Member] | Maximum [Member]
Finite Lived Intangible Assets [Line Items]
Amortization Period (Year)	15 years	15 years