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Note T - Income Taxes (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Income Tax Expense (Benefit), Total | $ 0 | $ 0
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total | 0 | $ 0
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] |  |
Operating Loss Carryforwards, Total | 63,000 |
Operating Loss Carryforwards, Subject to Expiration | 52,000 |
Operating Loss Carryforwards, Not Subject to Expiration | $ 11,000 |
Open Tax Year | 2017 2018 2019 2020 |
State and Local Jurisdiction [Member] |  |
Operating Loss Carryforwards, Total | $ 64,000 |
Open Tax Year | 2017 2018 2019 2020 |

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