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Note 9 - Investments in Marketable Securities - Available for Sale Marketable Equity Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
NHI Common Stock, Shares (in shares) | 1,630,642 | 1,630,642
NHI Common Stock, Cost | $ 24,734 | $ 24,734
NHI Common Stock, fair value | 123,040 | 111,117
NHI Common Stock [Member] |  |
NHI Common Stock, fair value | $ 102,453 | $ 91,071

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