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Note E - Convertible Preferred Stock (Details Textual) - USD ($) |  |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jun. 30, 2022 | Jan. 30, 2018 | Jan. 30, 2018 | Dec. 31, 2022 | Dec. 31, 2021
Preferred Stock, Shares Authorized (in shares) |  |  |  | 1,000,000 | 1,000,000
Stock Issued During Period, Value, New Issues |  |  |  | $ 1,077,000 |
Stock Redeemed or Called During Period, Value |  |  |  | $ 1,380,000 |
Common Stock, Par or Stated Value Per Share (in dollars per share) |  |  |  | $ 1 | $ 1
Preferred Stock [Member] |  |  |  |  |
Stock Issued During Period, Value, New Issues |  |  |  |  |
Stock Redeemed or Called During Period, Value |  |  |  | 9,723,000 |
Common Stock [Member] |  |  |  |  |
Stock Issued During Period, Value, New Issues |  |  |  | 100,000 |
Stock Redeemed or Called During Period, Value |  |  |  | $ (0) |
Wipro [Member] | Common Stock [Member] |  |  |  |  |
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ 1.00 |  |  |  |
Series A Preferred Stock [Member] |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage |  |  |  | 5.00% |
Preferred Stock, Convertible, Conversion Ratio (Rate) |  |  |  | 10091.00% |
Series A Preferred Stock [Member] | Wipro [Member] |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  | 9,926 |  |  |
Shares Issued, Price Per Share (in dollars per share) |  | $ 1,000 | $ 1,000 |  |
Stock Issued During Period, Value, New Issues |  | $ 9,900,000 | $ 9,900,000 |  |
Payments of Stock Issuance Costs |  | 200,000 |  |  |
Proceeds from Issuance of Preferred Stock and Preference Stock |  | $ 9,900,000 |  |  |
Series A Preferred Stock [Member] | Wipro [Member] | Preferred Stock [Member] |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) | 100,000 |  |  |  |
Stock Redeemed or Called During Period, Shares (in shares) | 9,926 |  |  |  |
Stock Redeemed or Called During Period, Value | $ 9,926,000 |  |  |  |

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