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Note 7 - Related Party Transactions (Details Textual) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Jun. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023 | Oct. 07, 2022
Investment Income, Net | $ 531 | $ 544 |  | $ 1,568 | $ 1,017 |  |
Gain (Loss) on Investments | $ (2) | $ (4) |  | (6) | 384 |  |
Income Taxes Paid |  |  |  | $ 76 | $ 207 |  |
GAMCO Investors, Inc. [Member] |  |  |  |  |  |  |
Investment Expense Rate | 0.08% | 0.08% |  | 0.08% | 0.16% |  |
Funds Invested in Mutual Funds | $ 33,931 |  |  | $ 33,931 |  | $ 32,568 |
Income From Mutual Funds | 444 | $ 350 |  | 1,293 | $ 1,172 |  |
Investment Income, Net |  |  |  |  | 802 |  |
Gain (Loss) on Investments |  |  |  |  | 370 |  |
MtronPTI [Member] |  |  |  |  |  |  |
Percentage of Shares Distribution Under Spinoff |  |  |  |  |  |  | 100.00%
Salaries and Benefits Reimbursed | 27 |  |  | 80 |  |  |
Excess Separation Costs |  |  | $ 28 |  |  |  |
MtronPTI [Member] | Transitional Administrative and Management Services Agreement [Member] |  |  |  |  |  |  |
Monthly Payment | 4 |  |  | 4 |  |  |
Related Party Transaction, Amounts of Transaction | 12 | 12 |  | 36 | 36 |  |
MtronPTI [Member] | Tax Indemnity and Sharing Agreement [Member] |  |  |  |  |  |  |
Income Taxes Paid | $ 0 | $ 0 |  | $ 0 | $ 0 |  |

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