Note 9 - Patents and Trademarks, Net - Patents and Trademarks (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Intangible assets, gross	$ 2,400	$ 2,400
Accumulated amortization	(2,161)	(2,078)
	239	322
Purchased and Licensed Patent Rights [Member]
Intangible assets, gross	566	566
Accumulated amortization	(555)	(548)
Internally Developed Patents [Member]
Intangible assets, gross	1,686	1,686
Accumulated amortization	(1,471)	(1,400)
Trademarks [Member]
Intangible assets, gross	148	148
Accumulated amortization	$ (135)	$ (130)

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 928
-SubTopic 340
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6473545&loc=d3e61844-108004

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-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
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