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Note 2 - Investments - Securities Measured and Carried at Fair Value on Recurring Basis With Significant Unobservable Inputs (Details) $ in Thousands | Dec. 31, 2024 USD ($) | Jun. 30, 2024 USD ($)
--- | --- | ---
Investments in debt securities | [1] | $ 3,037 |
Convertible Debt Securities [Member] |  |  |
Investments in debt securities |  | $ 3,037 | $ 4,414
Valuation Technique, Binomial Lattice Model [Member] | Measurement Input, Price Volatility [Member] |  |  |
Investments in debt securities, unobservable input |  | 0.95 |
Investments in equity securities, unobservable inputs |  |  | 0.95
Valuation Technique, Binomial Lattice Model [Member] | Measurement Input, Risk Free Interest Rate [Member] |  |  |
Investments in debt securities, unobservable input |  | 0.03 |
Valuation Technique, Binomial Lattice Model [Member] | Measurement Input, Credit Spread [Member] |  |  |
Investments in debt securities, unobservable input |  | 0.066 |
Investments in equity securities, unobservable inputs |  |  | 0.041
Valuation Technique, Binomial Lattice Model [Member] | Unsecured Convertible Debentures [Member] |  |  |
Investments in debt securities |  |  | $ 4,414
Valuation Technique, Binomial Lattice Model [Member] | Convertible Debt Securities [Member] |  |  |
Investments in debt securities |  | $ 3,037 |
Valuation Technique, Option Pricing Model [Member] | Measurement Input, Risk Free Interest Rate [Member] |  |  |
Investments in equity securities, unobservable inputs |  |  | 0.082
[1] | Principal payments of $750,000 are due quarterly with a final maturity in January 2026.

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