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Note 4 - Investments (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Proceeds from Sale and Maturity of Marketable Securities | $ 0 | $ 16,947
Marketable Security, Realized Gain (Loss) | $ (0) | $ (4,316)
Iron Net [Member] | Discontinued Operations, Disposed of by Sale [Member] |  |
Investment Owned, Balance, Shares (in shares) |  | 198,250
GAMCO Investors, Inc. [Member] | Discontinued Operations, Disposed of by Sale [Member] |  |
Proceeds from Sale and Maturity of Marketable Securities |  | $ 16,886
Marketable Security, Realized Gain (Loss) |  | $ 370

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