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Note R - Income Taxes (Details Textual) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Deferred Tax Assets, Valuation Allowance | $ 17,188,000 | $ 15,891,000 | $ 15,716,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total | 0 | $ 0 |
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] |  |  |
Operating Loss Carryforwards | 61,300,000 |  |
Operating Loss Carryforwards, Subject to Expiration | 43,100,000 |  |
Operating Loss Carryforwards, Not Subject to Expiration | $ 18,200,000 |  |
Open Tax Year | 2019 2020 2021 2022 |  |
State and Local Jurisdiction [Member] | Internal Revenue Service (IRS) [Member] |  |  |
Operating Loss Carryforwards, Subject to Expiration | $ 6,870,000 |  |

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