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Note 3 - Investments - Securities Measured and Carried at Fair Value on Recurring Basis With Significant Unobservable Inputs (Details) $ in Thousands | Dec. 31, 2023 USD ($) | Jun. 30, 2023 USD ($)
--- | --- | ---
Investments in equity securities |  | $ 11,297 | $ 13,205
Investments in debt securities | [1] | 5,784 |
Convertible Debt Securities [Member] |  |  |
Investments in debt securities |  | 5,784 | $ 7,008
Valuation Technique, Option Pricing Model [Member] |  |  |
Investments in equity securities |  | $ 2 |
Valuation Technique, Option Pricing Model [Member] | Measurement Input, Price Volatility [Member] |  |  |
Investments in debt securities, unobservable input |  | 1.85 |
Valuation Technique, Option Pricing Model [Member] | Measurement Input, Risk Free Interest Rate [Member] |  |  |
Investments in debt securities, unobservable input |  | 0.0466 |
Valuation Technique, Binomial Lattice Model [Member] | Convertible Debt Securities [Member] |  |  |
Investments in debt securities |  | $ 5,784 |
Valuation Technique, Binomial Lattice Model [Member] | Measurement Input, Price Volatility [Member] | Convertible Debt Securities [Member] |  |  |
Investments in debt securities, unobservable input |  | 1 |
Valuation Technique, Binomial Lattice Model [Member] | Measurement Input, Risk Free Interest Rate [Member] |  |  |
Investments in debt securities, unobservable input |  | 0.0378 |
Valuation Technique, Binomial Lattice Model [Member] | Measurement Input, Credit Spread [Member] |  |  |
Investments in debt securities, unobservable input |  | 0.099 |
[1] | Principal payments of $750,000 are due quarterly with a final maturity date in January 2026.

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