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Note 3 - Investments - Securities Measured and Carried at Fair Value on Recurring Basis With Significant Unobservable Inputs (Details)
$ in Thousands
Jun. 30, 2025
USD ($)
Jun. 30, 2024
USD ($)
Investments in debt securities [1] $ 1,576  
Convertible Debt Securities [Member]    
Investments in debt securities $ 1,576 $ 4,414
Valuation Technique, Binomial Lattice Model [Member] | Measurement Input, Price Volatility [Member]    
Investments in debt securities, unobservable input 0.85  
Investments in equity securities, unobservable inputs   0.95
Valuation Technique, Binomial Lattice Model [Member] | Measurement Input, Credit Spread [Member]    
Investments in debt securities, unobservable input 0.064  
Investments in equity securities, unobservable inputs   0.082
Valuation Technique, Binomial Lattice Model [Member] | Measurement Input, Risk Free Interest Rate [Member]    
Investments in debt securities, unobservable input 0.026  
Investments in equity securities, unobservable inputs   0.041
Valuation Technique, Binomial Lattice Model [Member] | Convertible Debt Securities [Member]    
Investments in debt securities $ 1,576  
Valuation Technique, Binomial Lattice Model [Member] | Unsecured Convertible Debentures [Member]    
Investments in debt securities   $ 4,414
[1] Principal payments of $750,000 are due quarterly with a final maturity in January 2026.