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Note 2 - Investments - Securities Measured and Carried at Fair Value on Recurring Basis With Significant Unobservable Inputs (Details) $ in Thousands		Sep. 30, 2025 USD ($)	Jun. 30, 2025 USD ($)
Investments in debt securities	[1]	$ 842
Convertible Debt Securities [Member]
Investments in debt securities		$ 842	$ 1,576
Valuation Technique, Binomial Lattice Model [Member] | Measurement Input, Price Volatility [Member]
Investments in debt securities, unobservable input			0.85
Valuation Technique, Binomial Lattice Model [Member] | Measurement Input, Credit Spread [Member]
Investments in debt securities, unobservable input			0.064
Valuation Technique, Binomial Lattice Model [Member] | Measurement Input, Risk Free Interest Rate [Member]
Investments in debt securities, unobservable input			0.026
Valuation Technique, Binomial Lattice Model [Member] | Convertible Debt Securities [Member]
Investments in debt securities			$ 1,576
[1] Principal payments of $750,000 are due quarterly with a final maturity in January 2026.

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- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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