Note 1 - Summary of Significant Accounting Policies - Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Customer Relationships [Member]
Cost	$ 41,530	$ 15,530
Weighted average life (Year)	10 years 292 days	8 years 292 days
Accumulated amortization	$ (7,762)	$ (4,782)
Net	33,768	10,748
Noncompete Agreements [Member]
Cost	$ 1,411	$ 5,551
Weighted average life (Year)	4 years 36 days	5 years 36 days
Accumulated amortization	$ (326)	$ (4,619)
Net	1,085	932
Customer Backlog [Member]
Cost		$ 122
Weighted average life (Year)		182 days
Accumulated amortization		$ (10)
Net		$ 112