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Note 8 - Related Party Transactions (Details Textual) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2023 | Sep. 30, 2023 | [1] | Jun. 30, 2023 | [1] | Mar. 31, 2023 | [1] | Dec. 31, 2022 | Sep. 30, 2022 | [1] | Jun. 30, 2022 | [1] | Mar. 31, 2022 | [1] | Dec. 31, 2023 | Dec. 31, 2022
Investment Income, Net |  |  |  |  |  |  |  |  |  |  | $ 1,566 | $ 413
Gain (Loss) on Investments | $ 0 | [1] | $ (4) | $ 43 | $ 345 | $ (298) | [1] | $ (2,121) | $ (2,373) | $ 45 | 384 | (4,747)
Income Taxes Paid |  |  |  |  |  |  |  |  |  |  | $ 207 | $ 741
GAMCO Investors, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |
Investment Expense Rate |  |  |  |  |  |  |  |  |  |  | 0.17% | 0.52%
Funds Invested in Mutual Funds | 32,568 |  |  |  |  | 26,811 |  |  |  |  | $ 32,568 | $ 26,811
Income From Mutual Funds |  |  |  |  |  |  |  |  |  |  | 1,677 |
Investment Income, Net |  |  |  |  |  |  |  |  |  |  | 1,307 |
Gain (Loss) on Investments |  |  |  |  |  |  |  |  |  |  | 370 |
GAMCO Investors, Inc. [Member] | Cash and Cash Equivalents [Member] |  |  |  |  |  |  |  |  |  |  |  |
Funds Invested in Mutual Funds |  |  |  |  |  | 10,295 |  |  |  |  |  | 10,295
GAMCO Investors, Inc. [Member] | Marketable Securities [Member] |  |  |  |  |  |  |  |  |  |  |  |
Funds Invested in Mutual Funds |  |  |  |  |  | $ 16,516 |  |  |  |  |  | 16,516
MtronPTI [Member] |  |  |  |  |  |  |  |  |  |  |  |
Excess Separation Costs |  |  |  |  |  |  |  |  |  |  | 28 | 219
MtronPTI [Member] | Transitional Administrative and Management Services Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |
Monthly Payment | $ 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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