Note 4 - Goodwill and Other Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Finite-lived intangible assets, gross, balance	$ 128,000	$ 128,000
Intangible assets, amortization expense	(4,392)
Finite-lived intangible assets, accumulated amortization, balance	(8,555)	(4,163)
Finite-lived intangible assets, net, balance	119,445	123,837
Customer Relationships [Member]
Finite-lived intangible assets, gross, balance	58,100	58,100
Intangible assets, amortization expense
Customer Relationships [Member] | Minimum [Member]
Finite-lived Intangible Asset, Useful Life (Year)	8 years
Customer Relationships [Member] | Maximum [Member]
Finite-lived Intangible Asset, Useful Life (Year)	15 years
Trade Names [Member]
Finite-lived intangible assets, gross, balance	$ 68,300	68,300
Intangible assets, amortization expense
Trade Names [Member] | Minimum [Member]
Finite-lived Intangible Asset, Useful Life (Year)	10 years
Trade Names [Member] | Maximum [Member]
Finite-lived Intangible Asset, Useful Life (Year)	15 years
Noncompete Agreements [Member]
Finite-lived intangible assets, gross, balance	$ 1,600	$ 1,600
Intangible assets, amortization expense
Noncompete Agreements [Member] | Minimum [Member]
Finite-lived Intangible Asset, Useful Life (Year)	4 years
Noncompete Agreements [Member] | Maximum [Member]
Finite-lived Intangible Asset, Useful Life (Year)	5 years