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Note 5 - Fair Value Measurements - Assets Measured at Fair Value on Recurring Basis (Details) - Fair Value, Recurring [Member] - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Assets, Fair Value Disclosure |  | $ 40,630 | $ 40,251
Cash and Cash Equivalents [Member] |  |  |
Assets, Fair Value Disclosure | [1] | 40,612 | 40,229
Equity Securities [Member] |  |  |
Assets, Fair Value Disclosure |  | 18 | 22
Marketable Securities [Member] |  |  |
Assets, Fair Value Disclosure |  | 18 | 22
Fair Value, Inputs, Level 1 [Member] |  |  |
Assets, Fair Value Disclosure |  | 40,630 | 40,251
Fair Value, Inputs, Level 1 [Member] | Cash and Cash Equivalents [Member] |  |  |
Assets, Fair Value Disclosure | [1] | 40,612 | 40,229
Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member] |  |  |
Assets, Fair Value Disclosure |  | 18 | 22
Fair Value, Inputs, Level 1 [Member] | Marketable Securities [Member] |  |  |
Assets, Fair Value Disclosure |  | 18 | 22
Fair Value, Inputs, Level 2 [Member] |  |  |
Assets, Fair Value Disclosure | [1] | 0 | 0
Fair Value, Inputs, Level 3 [Member] |  |  |
Assets, Fair Value Disclosure | [1] | $ 0 | $ 0
[1] | As of June 30, 2024 and December 31, 2023, included investments in money market mutual funds managed or advised by GAMCO Investors, Inc.

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