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Note 2 - Investments - Investments With Fair Values Adjusted on Recurring Basis (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Jun. 30, 2024
Fair value $ 10,918 $ 10,885
Total investments in trading securities: 11,166 11,093
Investments in debt securities [1] 3,742  
Corporate Debt Securities [Member]    
Corporate debt securities, fair value 248 208
Convertible Debt Securities [Member]    
Investments in debt securities 3,742 4,414
Fair Value, Recurring [Member]    
Total investments carried at fair value 14,908 15,507
Fair Value, Nonrecurring [Member]    
Total investments carried at fair value 0 [2] 600 [3]
Equity Securities International [Member]    
Fair value 347 435
Equity Securities International [Member] | Fair Value, Recurring [Member]    
Fair value 347 435
Mutual Funds Fixed Income [Member]    
Fair value 9,713 9,644
Mutual Funds Fixed Income [Member] | Fair Value, Recurring [Member]    
Fair value 9,713 9,644
Mutual Funds Global Equity [Member]    
Fair value 858 806
Mutual Funds Global Equity [Member] | Fair Value, Recurring [Member]    
Fair value 858 806
Fair Value, Inputs, Level 1 [Member]    
Fair value 10,918 10,885
Total investments in trading securities: 11,166 11,093
Fair Value, Inputs, Level 1 [Member] | Corporate Debt Securities [Member]    
Corporate debt securities, fair value 248 208
Fair Value, Inputs, Level 1 [Member] | Convertible Debt Securities [Member]    
Investments in debt securities 0 0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member]    
Total investments carried at fair value 11,166 11,093
Fair Value, Inputs, Level 1 [Member] | Fair Value, Nonrecurring [Member]    
Total investments carried at fair value 0 [2] 0 [3]
Fair Value, Inputs, Level 1 [Member] | Equity Securities International [Member] | Fair Value, Recurring [Member]    
Fair value 347 435
Fair Value, Inputs, Level 1 [Member] | Mutual Funds Fixed Income [Member] | Fair Value, Recurring [Member]    
Fair value 9,713 9,644
Fair Value, Inputs, Level 1 [Member] | Mutual Funds Global Equity [Member] | Fair Value, Recurring [Member]    
Fair value 858 806
Fair Value, Inputs, Level 2 [Member]    
Fair value 0 0
Total investments in trading securities: 0 0
Fair Value, Inputs, Level 2 [Member] | Corporate Debt Securities [Member]    
Corporate debt securities, fair value 0 0
Fair Value, Inputs, Level 2 [Member] | Convertible Debt Securities [Member]    
Investments in debt securities 0 0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member]    
Total investments carried at fair value 0 0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Nonrecurring [Member]    
Total investments carried at fair value 0 [2] 0 [3]
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] | Mutual Funds Global Equity [Member] | Fair Value, Recurring [Member]    
Fair value 0 0
Fair Value, Inputs, Level 3 [Member]    
Fair value 0 0
Total investments in trading securities: 0 0
Fair Value, Inputs, Level 3 [Member] | Corporate Debt Securities [Member]    
Corporate debt securities, fair value 0 0
Fair Value, Inputs, Level 3 [Member] | Convertible Debt Securities [Member]    
Investments in debt securities 3,742 4,414
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]    
Total investments carried at fair value 3,742 4,414
Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member]    
Total investments carried at fair value 0 [2] 600 [3]
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] | Mutual Funds Global Equity [Member] | Fair Value, Recurring [Member]    
Fair value $ 0 $ 0
[1] Principal payments of $750,000 are due quarterly with a final maturity in January 2026.
[2] Fair value information is not as of June 30, 2024. Other investments include equity securities without readily determinable fair values that were adjusted as a result of the measurement alternative during the 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.
[3] Fair value information is not as of June 30, 2023. Other investments include equity securities without readily determinable fair values that were adjusted as a result of the measurement alternative during the year ended June 30, 2023. These securities are classified as level 3 due to the infrequency of the observable price changes and/or restrictions on the shares.