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Note 7 - Income Taxes (Details Textual) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | $ 5,563,000 | $ (21,189,000)
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 21.00% | 34.00%
Unrecognized Tax Benefits, Ending Balance | $ 1,800,000 |
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 | $ 308,800,000 |
Open Tax Year | 2015 2016 2017 2018 |
Open Tax Period | 3 years |
State and Local Jurisdiction [Member] | California Franchise Tax Board [Member] |  |
Operating Loss Carryforwards, Total | $ 188,800,000 |
Open Tax Year | 2014 2015 2016 2017 2018 |
Open Tax Period | 4 years |

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