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Note 7 - Stockholders' Equity (Details Textual) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 6 Months Ended | 103 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Aug. 31, 2020 | Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Dec. 31, 2024 | Nov. 30, 2016
Dividends, Preferred Stock |  | $ 1,223 | $ 1,150 | $ 2,426 | $ 2,287 |  |  |
Preferred Stock, Shares Outstanding (in shares) |  | 62,000 |  | 62,000 |  | 62,000 | 62,000 |
Convertible Preferred Stock, Shares Reserved for Future Issuance (in shares) |  | 8,700,000 |  | 8,700,000 |  | 8,700,000 |  |
Series A Redeemable Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |
Temporary Equity, Shares Issued (in shares) |  | 62,000 |  | 62,000 |  | 62,000 | 62,000 |
Deferred Offering Costs |  | $ 2,100 |  | $ 2,100 |  | $ 2,100 |  |
Dividends, Preferred Stock |  | $ 1,200 | $ 1,200 | $ 2,400 | $ 2,300 |  |  |
Preferred Stock, Shares Outstanding (in shares) |  | 62,000 |  | 62,000 |  | 62,000 |  |
Series A Redeemable Convertible Preferred Stock [Member] | Private Placement [Member] |  |  |  |  |  |  |  |
Temporary Equity, Shares Issued (in shares) | 85,000 |  |  |  |  |  |  |
Shares Issued, Price Per Share (in dollars per share) | $ 1,000 |  |  |  |  |  |  |
Proceeds from Issuance of Preferred Stock and Preference Stock | $ 85,000 |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage | 6.00% |  |  |  |  |  |  |
Convertible Preferred Stock, Conversion Price (in dollars per share) | $ 9.5 |  |  |  |  |  |  |
Stock and Warrant Repurchase Plan [Member] |  |  |  |  |  |  |  |
Share Repurchase Program, Authorized, Amount |  |  |  |  |  |  |  | $ 35,000
Warrants Repurchased During Period (in shares) |  |  |  |  |  | 6,011,926 |  |
Warrants Repurchased During Period, Value |  |  |  |  |  | $ 14,700 |  |
Share Repurchase Program, Remaining Authorized, Amount |  | $ 12,000 |  | $ 12,000 |  | $ 12,000 |  |
Stock and Warrant Repurchase Plan [Member] | Common Stock [Member] |  |  |  |  |  |  |  |
Stock Repurchased During Period, Shares (in shares) |  |  |  | 0 |  | 875,218 |  |
Stock Repurchased During Period, Value |  |  |  |  |  | $ 8,300 |  |

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