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Note 7 - Income Taxes (Details Textual) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | $ 5,334,000 | $ 4,148,000
Unrecognized Tax Benefits, Ending Balance | 1,200,000 |
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] |  |
Operating Loss Carryforwards, Total | $ 325,000,000 |
Open Tax Year | 2017 2018 2019 2020 |
Open Tax Period (Year) | 3 years |
State and Local Jurisdiction [Member] | California Franchise Tax Board [Member] |  |
Operating Loss Carryforwards, Total | $ 237,000,000 |
Open Tax Year | 2016 2017 2018 2019 2020 |
Open Tax Period (Year) | 4 years |

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