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Note P - Income Taxes (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Income Tax Expense (Benefit), Total | $ 0 | $ 0
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 21.00% | 34.00%
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 | $ 60,000 |
Open Tax Year | 2015 2016 2017 2018 |
State and Local Jurisdiction [Member] |  |
Open Tax Year | 2015 2016 2017 2018 |

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