Note 7 - Related Party Transactions (Details Textual) - USD ($) $ in Thousands |
3 Months Ended | |||
|---|---|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
Dec. 31, 2025 |
Oct. 07, 2022 |
|
| Income Taxes Paid | $ 52 | $ 0 | ||
| GAMCO Investors, Inc. [Member] | ||||
| Investment Expense Rate | 0.08% | 0.08% | ||
| Funds Invested in Mutual Funds | $ 41,188 | $ 36,175 | ||
| Income From Mutual Funds | 346 | $ 348 | ||
| MtronPTI [Member] | ||||
| Percentage of Shares Distribution Under Spinoff | 100.00% | |||
| Salaries and Benefits Reimbursed | 28 | 26 | ||
| MtronPTI [Member] | Transitional Administrative and Management Services Agreement [Member] | ||||
| Monthly Payment | 4 | |||
| MtronPTI [Member] | Tax Indemnity and Sharing Agreement [Member] | ||||
| Related Party Transaction, Amounts of Transaction | 12 | |||
| Income Taxes Paid | $ 0 | $ 0 | ||