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Note 3 - Investments - Securities Measured and Carried at Fair Value on Recurring Basis With Significant Unobservable Inputs (Details) $ in Thousands | Sep. 30, 2023 USD ($) | Jun. 30, 2023 USD ($)
--- | --- | ---
Investments in equity securities | $ 11,920 |  | $ 13,205
Investments in debt securities | 6,343 | [1] | $ 7,008
Valuation Technique, Option Pricing Model [Member] |  |  |
Investments in equity securities | $ 4 |  |
Valuation Technique, Option Pricing Model [Member] | Measurement Input, Price Volatility [Member] |  |  |
Investments in debt securities, unobservable input | 0.90 |  |
Valuation Technique, Option Pricing Model [Member] | Measurement Input, Risk Free Interest Rate [Member] |  |  |
Investments in debt securities, unobservable input | 0.051 |  |
Valuation Technique, Binomial Lattice Model [Member] |  |  |
Investments in debt securities | $ 6,343 |  |
Valuation Technique, Binomial Lattice Model [Member] | Measurement Input, Price Volatility [Member] |  |  |
Investments in debt securities, unobservable input | 0.90 |  |
Valuation Technique, Binomial Lattice Model [Member] | Measurement Input, Risk Free Interest Rate [Member] |  |  |
Investments in debt securities, unobservable input | 0.047 |  |
Valuation Technique, Binomial Lattice Model [Member] | Measurement Input, Credit Spread [Member] |  |  |
Investments in debt securities, unobservable input | 0.104 |  |
[1] | Principal payments of $750,000 are due quarterly with a final maturity date in January 2026.

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