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Note 2 - Investments - Investments With Fair Values Adjusted on Recurring Basis (Details) - USD ($)
$ in Thousands
Mar. 31, 2025
Jun. 30, 2024
Fair value $ 10,853 $ 10,885
Total investments in trading securities: 11,003 11,093
Investments in debt securities [1] 2,302  
Corporate Debt Securities [Member]    
Corporate debt securities, fair value 150 208
Convertible Debt Securities [Member]    
Investments in debt securities 2,302 4,414
Fair Value, Recurring [Member]    
Fair value 10,853 10,885
Total investments in trading securities: 11,003 11,093
Total investments carried at fair value 13,305 15,507
Fair Value, Recurring [Member] | Corporate Debt Securities [Member]    
Corporate debt securities, fair value 150 208
Fair Value, Recurring [Member] | Convertible Debt Securities [Member]    
Investments in debt securities 2,302 4,414
Equity Securities Domestic [Member]    
Fair value 15 0
Equity Securities Domestic [Member] | Fair Value, Recurring [Member]    
Fair value 15  
Equity Securities International [Member]    
Fair value 309 435
Equity Securities International [Member] | Fair Value, Recurring [Member]    
Fair value 309 435
Mutual Funds Fixed Income [Member]    
Fair value 9,692 9,644
Mutual Funds Fixed Income [Member] | Fair Value, Recurring [Member]    
Fair value 9,692 9,644
Exchange Traded Funds Global Equity [Member]    
Fair value 69  
Exchange Traded Funds Global Equity [Member] | Fair Value, Recurring [Member]    
Fair value 69  
Mutual Funds Global Equity [Member]    
Fair value 768 806
Mutual Funds Global Equity [Member] | Fair Value, Recurring [Member]    
Fair value 768 806
Other Long-Term Investments [Member] | Fair Value, Nonrecurring [Member]    
Total investments carried at fair value 0 [2] 600 [3]
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member]    
Fair value 10,853 10,885
Total investments in trading securities: 11,003 11,093
Total investments carried at fair value 11,003 11,093
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Corporate Debt Securities [Member]    
Corporate debt securities, fair value 150 208
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Convertible Debt Securities [Member]    
Investments in debt securities 0 0
Fair Value, Inputs, Level 1 [Member] | Equity Securities Domestic [Member] | Fair Value, Recurring [Member]    
Fair value 15  
Fair Value, Inputs, Level 1 [Member] | Equity Securities International [Member] | Fair Value, Recurring [Member]    
Fair value 309 435
Fair Value, Inputs, Level 1 [Member] | Mutual Funds Fixed Income [Member] | Fair Value, Recurring [Member]    
Fair value 9,692 9,644
Fair Value, Inputs, Level 1 [Member] | Exchange Traded Funds Global Equity [Member] | Fair Value, Recurring [Member]    
Fair value 69  
Fair Value, Inputs, Level 1 [Member] | Mutual Funds Global Equity [Member] | Fair Value, Recurring [Member]    
Fair value 768 806
Fair Value, Inputs, Level 1 [Member] | Other Long-Term Investments [Member] | Fair Value, Nonrecurring [Member]    
Total investments carried at fair value 0 [2] 0 [3]
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member]    
Fair value 0 0
Total investments in trading securities: 0 0
Total investments carried at fair value 0 0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Corporate Debt Securities [Member]    
Corporate debt securities, fair value 0 0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Convertible Debt Securities [Member]    
Investments in debt securities 0 0
Fair Value, Inputs, Level 2 [Member] | Equity Securities Domestic [Member] | Fair Value, Recurring [Member]    
Fair value 0  
Fair Value, Inputs, Level 2 [Member] | Equity Securities International [Member] | Fair Value, Recurring [Member]    
Fair value 0 0
Fair Value, Inputs, Level 2 [Member] | Mutual Funds Fixed Income [Member] | Fair Value, Recurring [Member]    
Fair value 0 0
Fair Value, Inputs, Level 2 [Member] | Exchange Traded Funds Global Equity [Member] | Fair Value, Recurring [Member]    
Fair value 0  
Fair Value, Inputs, Level 2 [Member] | Mutual Funds Global Equity [Member] | Fair Value, Recurring [Member]    
Fair value 0 0
Fair Value, Inputs, Level 2 [Member] | Other Long-Term Investments [Member] | Fair Value, Nonrecurring [Member]    
Total investments carried at fair value 0 [2] 0 [3]
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]    
Fair value 0 0
Total investments in trading securities: 0 0
Total investments carried at fair value 2,302 4,414
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Corporate Debt Securities [Member]    
Corporate debt securities, fair value 0 0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Convertible Debt Securities [Member]    
Investments in debt securities 2,302 4,414
Fair Value, Inputs, Level 3 [Member] | Equity Securities Domestic [Member] | Fair Value, Recurring [Member]    
Fair value 0  
Fair Value, Inputs, Level 3 [Member] | Equity Securities International [Member] | Fair Value, Recurring [Member]    
Fair value 0 0
Fair Value, Inputs, Level 3 [Member] | Mutual Funds Fixed Income [Member] | Fair Value, Recurring [Member]    
Fair value 0 0
Fair Value, Inputs, Level 3 [Member] | Exchange Traded Funds Global Equity [Member] | Fair Value, Recurring [Member]    
Fair value 0  
Fair Value, Inputs, Level 3 [Member] | Mutual Funds Global Equity [Member] | Fair Value, Recurring [Member]    
Fair value 0 0
Fair Value, Inputs, Level 3 [Member] | Other Long-Term Investments [Member] | Fair Value, Nonrecurring [Member]    
Total investments carried at fair value $ 0 [2] $ 600 [3]
[1] Principal payments of $750,000 are due quarterly with a final maturity date in January 2026.
[2] Other investments include equity securities without readily determinable fair values that are adjusted as a result of the measurement alternative. There were no adjustments during the nine months ended March 31, 2025.
[3] Other investments include equity securities without readily determinable fair values that were adjusted as a result of the measurement alternative on dates during the fiscal year ended June 30, 2024. These securities are classified as level 3 due to the infrequency of the observable price changes and/or restrictions on the shares.