Note 7 - Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Intangible assets, cost	$ 10,307	$ 10,307
Intangible assets, accumulated amortization	7,528	5,827
	$ 2,779	4,480
In Process Research and Development [Member]
Intangible assets, useful life (Year)	6 years
Intangible assets, cost	$ 7,702	7,702
Intangible assets, accumulated amortization	$ 6,418	5,134
Distribution Rights [Member]
Intangible assets, useful life (Year)	5 years
Intangible assets, cost	$ 2,086	2,086
Intangible assets, accumulated amortization	$ 591	174
Noncompete Agreements [Member]
Intangible assets, useful life (Year)	3 years
Intangible assets, cost	$ 519	519
Intangible assets, accumulated amortization	$ 519	$ 519