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Note 3 - Investments - Securities Measured and Carried at Fair Value on Recurring Basis With Significant Unobservable Inputs (Details) $ in Thousands | Mar. 31, 2024 USD ($) | Jun. 30, 2023 USD ($)
--- | --- | ---
Investments in debt securities | [1] | $ 5,190 |
Convertible Debt Securities [Member] |  |  |
Investments in debt securities |  | $ 5,190 | $ 7,008
Valuation Technique, Binomial Lattice Model [Member] | Measurement Input, Credit Spread [Member] |  |  |
Corporate debt securities - Convertible debentures |  | 0.0428 |
Valuation Technique, Binomial Lattice Model [Member] | Convertible Debt Securities [Member] |  |  |
Investments in debt securities |  | $ 5,190 |
Valuation Technique, Binomial Lattice Model [Member] | Convertible Debt Securities [Member] | Measurement Input, Price Volatility [Member] |  |  |
Corporate debt securities - Convertible debentures |  | 1.10 |
Valuation Technique, Option Pricing Model [Member] | Measurement Input, Risk Free Interest Rate [Member] |  |  |
Corporate debt securities - Convertible debentures |  | 0.07 |
[1] | Principal payments of $750,000 are due quarterly with a final maturity date in January 2026.

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