Note 6 - Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Jul. 31, 2015
Intangibles, gross	$ 12,729	$ 12,729
Intangibles, accumulated amortization	(4,754)	(3,175)
Intangibles, net	$ 7,975	9,554
Intangible, weighted average useful life (Year)	7 years
Trade Names [Member]
Intangibles, gross	$ 2,900	2,900
Intangibles, accumulated amortization	(515)	(322)
Intangibles, net	$ 2,385	2,578
Intangible, weighted average useful life (Year)	12 years 109 days
Customer Lists [Member]
Intangibles, gross	$ 3,300	3,300
Intangibles, accumulated amortization	(1,760)	(1,100)
Intangibles, net	$ 1,540	2,200
Intangible, weighted average useful life (Year)	2 years 109 days
Operating Rights [Member]
Intangibles, gross	$ 6,529	6,529	$ 6,500
Intangibles, accumulated amortization	(2,479)	(1,753)
Intangibles, net	$ 4,050	$ 4,776
Intangible, weighted average useful life (Year)	5 years 219 days