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Note 7 - Related Party Transactions (Details Textual) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Mar. 31, 2025 | Dec. 31, 2024 | Oct. 07, 2022
Income Taxes Paid |  |  | $ 47 | $ 76 |  |  |
GAMCO Investors, Inc. [Member] |  |  |  |  |  |  |
Investment Expense Rate | 0.08% | 0.08% | 0.08% | 0.08% |  |  |
Funds Invested in Mutual Funds | $ 35,515 |  | $ 35,515 |  |  | $ 34,242 |
Income From Mutual Funds | 177 | $ 471 | 891 | $ 1,293 |  |  |
MtronPTI [Member] |  |  |  |  |  |  |
Percentage of Shares Distribution Under Spinoff |  |  |  |  |  |  | 100.00%
Salaries and Benefits Reimbursed | 28 | 27 | 12 | 80 |  |  |
MtronPTI [Member] | Transitional Administrative and Management Services Agreement [Member] |  |  |  |  |  |  |
Monthly Payment |  |  |  |  | $ 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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- Definition Amount, before refund, of cash paid to foreign, federal, state, and local jurisdictions as income tax. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2A -Publisher FASB -URI https://asc.fasb.org/1943274/2147482913/230-10-50-2A Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 23 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-23 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 22 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-22 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 25 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-25 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482913/230-10-50-2 + Details
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