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Note 8 - Income Taxes (Details Textual) $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($)
Deferred Tax Assets, Net, Total	$ 0
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards	$ 330,000
Open Tax Year	2019 2020 2021 2022
Open Tax Period (Year)	3 years
State and Local Jurisdiction [Member] | California Franchise Tax Board [Member]
Operating Loss Carryforwards	$ 283,000
Open Tax Year	2018 2019 2020 2021 2022
Open Tax Period (Year)	4 years

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- Definition

The period of time that certain aspects of the business may be under review for tax purposes.

+ References

No definition available.

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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
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Tax year that remains open to examination under enacted tax laws, in YYYY format.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
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-Section 50
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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

+ References

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-Section 50
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