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Note 7 - Related Party Transactions (Tables) | 3 Months Ended
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Mar. 31, 2024
Notes Tables |
Schedule of Related Party Transactions [Table Text Block] |
|  | Three Months Ended March 31,
|  | 2024 |  | 2023
|  | Income |  | Expense |  | Income |  | Expense
GAMCO Investors, Inc. |  | $ | 408 |  |  | $ | — |  |  | $ | 434 |  |  | $ | — |
M-tron Industries, Inc. |  |  | — |  |  |  | (14 | ) |  |  | — |  |  |  | (16 | )
Total |  | $ | 408 |  |  | $ | (14 | ) |  | $ | 434 |  |  | $ | (16 | )
|  | March 31, 2024 |  | December 31, 2023
|  | Assets |  | Liabilities |  | Assets |  | Liabilities
GAMCO Investors, Inc. |  | $ | 32,977 |  |  | $ | — |  |  | $ | 32,568 |  |  | $ | — |
M-tron Industries, Inc. |  |  | 5 |  |  |  | — |  |  |  | — |  |  |  | — |
Total |  | $ | 32,982 |  |  | $ | — |  |  | $ | 32,568 |  |  | $ | — |

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- Definition Tabular disclosure of related party transactions. Examples of related party transactions include, but are not limited to, transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners and (d) affiliates. + References No definition available. + Details
Name: | us-gaap_ScheduleOfRelatedPartyTransactionsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_TableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration