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Note 4 - Investments - Securities Measured and Carried at Fair Value on Recurring Basis With Significant Unobservable Inputs (Details) $ in Thousands | Jun. 30, 2024 USD ($) | Jun. 30, 2023 USD ($)
--- | --- | ---
Investments in debt securities | [1] | $ 4,414 |
Convertible Debt Securities [Member] |  |  |
Investments in debt securities |  | $ 4,414 | $ 7,008
Valuation Technique, Option Pricing Model [Member] | Measurement Input, Price Volatility [Member] |  |  |
Investments in equity securities, unobservable inputs |  |  | 1
Valuation Technique, Option Pricing Model [Member] | Measurement Input, Risk Free Interest Rate [Member] |  |  |
Investments in equity securities, unobservable inputs |  |  | 0.05
Valuation Technique, Option Pricing Model [Member] | Common Shares Purchase Warrants [Member] |  |  |
Investments in debt securities |  |  | $ 290
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 |  |  | 1
Valuation Technique, Binomial Lattice Model [Member] | Measurement Input, Risk Free Interest Rate [Member] |  |  |
Investments in debt securities, unobservable input |  | 0.041 |
Investments in equity securities, unobservable inputs |  |  | 0.042
Valuation Technique, Binomial Lattice Model [Member] | Measurement Input, Credit Spread [Member] |  |  |
Investments in debt securities, unobservable input |  | 0.082 |
Investments in equity securities, unobservable inputs |  |  | 0.115
Valuation Technique, Binomial Lattice Model [Member] | Convertible Debt Securities [Member] |  |  |
Investments in debt securities |  | $ 4,414 |
Valuation Technique, Binomial Lattice Model [Member] | Unsecured Convertible Debentures [Member] |  |  |
Investments in debt securities |  |  | $ 7,008
[1] | Principal payments of $750,000 are due quarterly with a final maturity in January 2026.

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