Note 8 - Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Intangible assets, cost	$ 2,605	$ 2,605
Intangible assets, accumulated amortization	1,944	1,527
	$ 661	1,078
Distribution Rights [Member]
Intangible assets, useful life (Year)	5 years
Intangible assets, cost	$ 2,086	2,086
Intangible assets, accumulated amortization	$ 1,425	1,008
Noncompete Agreements [Member]
Intangible assets, useful life (Year)	3 years
Intangible assets, cost	$ 519	519
Intangible assets, accumulated amortization	$ 519	$ 519