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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, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Income | $ 1,068 | $ 721 | $ 1,956 | $ 1,705 |
Expense | (831) | (853) | (1,640) | (1,587) |
Assets | 42,247 |  | 42,247 |  | $ 41,850
Liabilities | 1,343 |  | 1,343 |  | 1,168
GAMCO Investors, Inc. [Member] |  |  |  |  |
Income | 441 | 388 | 849 | 822 |
Expense | 0 | 0 | 0 | 0 |
Assets | 33,488 |  | 33,488 |  | 32,568
Liabilities | 0 |  | 0 |  | 0
Mtron Industries Inc [Member] |  |  |  |  |
Income | 0 | 0 | 0 | 0 |
Expense | (15) | 12 | (29) | (4) |
Assets | 0 |  | 0 |  | 0
Liabilities | 74 |  | 74 |  | 0
Related Party [Member] |  |  |  |  |
Income | 441 | 388 | 849 | 822 |
Expense | (15) | $ 12 | (29) | $ (4) |
Assets | 33,488 |  | 33,488 |  | 32,568
Liabilities | $ 74 |  | $ 74 |  | $ 0

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