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Note 7 - Related Party Transactions (Details Textual) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2024 | Sep. 30, 2024 | [1] | Jun. 30, 2024 | [1] | Mar. 31, 2024 | [1] | Dec. 31, 2023 | Sep. 30, 2023 | [1] | Jun. 30, 2023 | [1] | Mar. 31, 2023 | [1] | Dec. 31, 2024 | Dec. 31, 2024 | Dec. 31, 2023
Investment Income, Net |  |  |  |  |  |  |  |  |  |  |  | $ 2,071 | $ 1,566
Gain (Loss) on Investments | $ 1 | [1] | $ (2) | $ (1) | $ (3) | $ 0 | [1] | $ (4) | $ 43 | $ 345 |  | (5) | 384
Income Taxes Paid |  |  |  |  |  |  |  |  |  |  |  | 76 | $ 207
GAMCO Investors, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Investment Expense Rate |  |  |  |  |  |  |  |  |  |  | 0.08% |  | 0.17%
Funds Invested in Mutual Funds | 34,242 |  |  |  |  | $ 32,568 |  |  |  |  | $ 34,242 | 34,242 | $ 32,568
Income From Mutual Funds |  |  |  |  |  |  |  |  |  |  |  | 1,712 | 1,677
Investment Income, Net |  |  |  |  |  |  |  |  |  |  |  |  | 1,307
Gain (Loss) on Investments |  |  |  |  |  |  |  |  |  |  |  |  | 370
MtronPTI [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Salaries and Benefits Reimbursed |  |  |  |  |  |  |  |  |  |  |  | 105 |
Excess Separation Costs |  |  |  |  |  |  |  |  |  |  |  | 0 | 28
MtronPTI [Member] | Transitional Administrative and Management Services Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Monthly Payment | $ 4 |  |  |  |  |  |  |  |  |  | $ 4 | 4 |
MtronPTI [Member] | Tax Indemnity and Sharing Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes Paid |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0
[1] | During Q1 and Q2 2023, the net gains primarily relate to the sale of our investments in mutual funds managed by GAMCO Investors, Inc.

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