Note 7 - Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Intangible assets, cost	$ 10,307	$ 10,307
Intangible assets, accumulated amortization	9,229	7,528
	$ 1,078	2,779
In Process Research and Development [Member]
Intangible assets, useful life (Year)	6 years
Intangible assets, cost	$ 7,702	7,702
Intangible assets, accumulated amortization	$ 7,702	6,418
Distribution Rights [Member]
Intangible assets, useful life (Year)	5 years
Intangible assets, cost	$ 2,086	2,086
Intangible assets, accumulated amortization	$ 1,008	591
Noncompete Agreements [Member]
Intangible assets, useful life (Year)	3 years
Intangible assets, cost	$ 519	519
Intangible assets, accumulated amortization	$ 519	$ 519