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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 |

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- Definition Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, without jurisdictional netting. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32537-109319 + Details
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