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Note 7 - Related Party Transactions - Transactions With Related Parties (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Dec. 31, 2024 | Sep. 30, 2024 | Dec. 31, 2023
Income | $ 924 | $ 1,068 | $ 1,842 | $ 1,956 |  |  |
Expense | (955) | (831) | (1,832) | (1,640) |  |  |
Assets | 43,030 |  | 43,030 |  | $ 43,145 |  |
Liabilities | 1,898 |  | 1,898 |  | $ 1,905 |  |
GAMCO Investors, Inc. [Member] |  |  |  |  |  |  |
Income | 366 | 441 | 714 | 849 |  |  |
Expense | 0 | 0 | 0 | 0 |  |  |
Assets |  |  |  |  |  | $ 35,069 | $ 34,242
Liabilities |  |  |  |  |  | 0 | 0
Mtron Industries Inc [Member] |  |  |  |  |  |  |
Income | 0 | 0 | 0 | 0 |  |  |
Expense | 22 | (15) | 8 | (29) |  |  |
Assets |  |  |  |  |  | 0 | 0
Liabilities |  |  |  |  |  | 128 | 59
Related Party [Member] |  |  |  |  |  |  |
Income | 366 | 441 | 714 | 849 |  |  |
Expense | $ 22 | $ (15) | $ 8 | $ (29) |  |  |
Assets |  |  |  |  |  | 35,069 | 34,242
Liabilities |  |  |  |  |  | $ 128 | $ 59

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