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Note 7 - Related Party Transactions (Details Textual) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2024 | Mar. 31, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023 | Oct. 07, 2022
Investment Income, Net | $ 538 |  | $ 275 | $ 1,037 | $ 473 |  |
Gain (Loss) on Investments | $ (1) |  | $ 43 | (4) | 388 |  |
Income Taxes Paid |  |  |  | $ 76 | $ 134 |  |
GAMCO Investors, Inc. [Member] |  |  |  |  |  |  |
Investment Expense Rate | 0.08% |  | 0.08% | 0.08% | 0.14% |  |
Funds Invested in Mutual Funds | $ 33,488 |  |  | $ 33,488 |  | $ 32,568 |
Income From Mutual Funds | 441 |  | $ 388 | 849 | $ 822 |  |
Investment Income, Net |  |  | 331 |  | 452 |  |
Gain (Loss) on Investments |  |  | 57 |  | 370 |  |
MtronPTI [Member] |  |  |  |  |  |  |
Percentage of Shares Distribution Under Spinoff |  |  |  |  |  |  | 100.00%
Salaries and Benefits Reimbursed | 27 |  |  | 53 |  |  |
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 | $ 24 | 24 |  |
MtronPTI [Member] | Tax Indemnity and Sharing Agreement [Member] |  |  |  |  |  |  |
Income Taxes Paid | $ 0 | $ 0 | $ 0 |  | $ 0 |  |

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