Note 3 - Investments - Securities Measured and Carried at Fair Value on Recurring Basis With Significant Unobservable Inputs (Details) $ in Thousands	Mar. 31, 2026 USD ($)	Jun. 30, 2025 USD ($)
Investments in debt securities	$ 0
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
Convertible Debt Securities [Member]
Investments in debt securities		$ 1,576
Convertible Debt Securities [Member] | Valuation Technique, Binomial Lattice Model [Member]
Investments in debt securities		$ 1,576