Note 7 - Intangible Assets - Summary of Intangible Assets (Details) - USD ($) $ in Thousands		Dec. 31, 2017	Dec. 31, 2016
Gross Carrying Amount		$ 3,848	$ 3,967
Accumulated Amortization		(1,945)	(1,569)
Intangible Assets, Net		1,903	2,398
Customer Relationships [Member]
Gross Carrying Amount		1,378	1,378
Accumulated Amortization		(551)	(413)
Intangible Assets, Net		827	965
Patents [Member]
Gross Carrying Amount		1,162	1,162
Accumulated Amortization		(929)	(697)
Intangible Assets, Net		233	465
Trademarks and Trade Names [Member]
Gross Carrying Amount		1,132	1,132
Accumulated Amortization		(302)	(226)
Intangible Assets, Net		830	906
Other Intangible Assets [Member]
Gross Carrying Amount	[1]	176	295
Accumulated Amortization	[1]	(163)	(233)
Intangible Assets, Net	[1]	$ 13	$ 62

[1] Other intangibles consist of favorable lease contracts and non-compete agreements.