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Note 8 - Stockholders' Equity (Details Textual) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended | 108 Months Ended |
--- | --- | --- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2015 | Dec. 31, 2024 | Oct. 27, 2014
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest | $ 10,000 | $ (140,000) | $ (1,031,000) | $ (210,000) |  |  |
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest | 65,000 | 376,000 | 246,000 | 118,000 |  |  |
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent | $ 0 | $ 0 | $ 0 | $ 0 |  |  |
Share Repurchase Program, Authorized, Amount |  |  |  |  |  |  | $ 5,000,000
Treasury Stock, Shares, Acquired (in shares) | 0 | 0 | 0 |  | 908,000 | 0 |
Shares Acquired, Average Cost Per Share (in dollars per share) |  |  |  |  | $ 2.52 |  |
Treasury Stock, Value, Acquired, Cost Method |  |  |  |  | $ 2,300,000 |  |
Share Repurchase Program, Remaining Authorized, Amount | $ 2,700,000 |  | $ 2,700,000 |  |  |  |
Dividends Payable, Current | $ 2,901,000 |  | $ 2,901,000 |  |  | $ 2,901,000 |
Series A Preferred Stock [Member] |  |  |  |  |  |  |
Dividends Payable, Current |  |  |  |  | $ 2,900,000 |  |

X
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