Note 1 - Organization and Significant Accounting Policies - Summary of Intangible Asset Activity (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Gross Carrying Amount	$ 852	$ 826
Accumulated Amortization	(525)	(468)
Net Carrying Amount	327	358
Patents [Member]
Gross Carrying Amount	852	826
Accumulated Amortization	(525)	(468)
Net Carrying Amount	$ 327	$ 358
Patents [Member] \| Minimum [Member]
Amortization Period (Year)	1 year
Patents [Member] \| Maximum [Member]
Amortization Period (Year)	20 years

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 350
-SubTopic 30
-Name Accounting Standards Codification
-Section 55
-Paragraph 40
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482640/350-30-55-40

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-Topic 350
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

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/exampleRef
-Topic 350
-SubTopic 30
-Name Accounting Standards Codification
-Section 55
-Paragraph 40
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482640/350-30-55-40

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
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-SubTopic 20
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-Section 50
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483154/926-20-50-5

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