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Note 7 - Income Taxes (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	$ 10,625,000	$ 5,334,000
Unrecognized Tax Benefits, Ending Balance	900,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	0
Deferred Tax Assets, Net, Total	$ 0
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Open Tax Year	2018 2019 2020 2021
Open Tax Period (Year)	3 years
Domestic Tax Authority [Member] | California Franchise Tax Board [Member]
Open Tax Year	2017 2018 2019 2020 2021
State and Local Jurisdiction [Member] | California Franchise Tax Board [Member]
Open Tax Period (Year)	4 years

X

- Definition

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

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Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, without jurisdictional netting.

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Tax year that remains open to examination under enacted tax laws, in YYYY format.

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Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset.

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