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Note 5 - Investments - Net Gain (Losses) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2023 | [2] | Sep. 30, 2023 | [2] | Jun. 30, 2023 | [2] | Mar. 31, 2023 | [2] | Dec. 31, 2022 | [2] | Sep. 30, 2022 | [2] | Jun. 30, 2022 | [2] | Mar. 31, 2022 | [2] | Dec. 31, 2023 | Dec. 31, 2022
Marketable securities (a) | [1] |  |  |  |  |  |  |  |  | $ 384 | $ (4,747)
Net gains (losses) |  | $ 0 | $ (4) | $ 43 | $ 345 | $ (298) | $ (2,121) | $ (2,373) | $ 45 | $ 384 | $ (4,747)
[1] | During 2023, the Company sold its investments in mutual funds managed by GAMCO Investors, Inc. as well as 198,250 shares of IronNet, Inc.
[2] | During Q1 and Q2 2023, the net gains primarily relate to the sale of our investments in mutual funds managed by GAMCO Investors, Inc.

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- Definition Amount of realized and unrealized gain (loss) on investment. + References Reference 1: http://www.xbrl.org/2003/role/recommendedDisclosureRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-28 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(c),9(a)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483621/220-10-S99-2 + Details
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- Definition Amount of realized and unrealized gain (loss) on investment in marketable security. + References No definition available. + Details
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