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Note 2 - Investments - Investments With Fair Values Adjusted on Recurring Basis (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Jun. 30, 2025
Fair value $ 12,723 $ 12,126
Total investments in trading securities: 12,774 12,188
Investments in debt securities [1] 842  
Corporate Debt Securities [Member]    
Corporate debt securities, fair value 51 62
Convertible Debt Securities [Member]    
Investments in debt securities 842 1,576
Fair Value, Recurring [Member]    
Total investments carried at fair value 13,616 13,764
Fair Value, Nonrecurring [Member]    
Total investments carried at fair value [2] 1,828 189
Equity Securities Domestic [Member]    
Fair value 60 27
Equity Securities Domestic [Member] | Fair Value, Recurring [Member]    
Fair value 60 27
Equity Securities International [Member]    
Fair value 847 426
Equity Securities International [Member] | Fair Value, Recurring [Member]    
Fair value 847 426
Exchange Traded Funds Crypto and Digital Asset [Member]    
Fair value 992 997
Exchange Traded Funds Crypto and Digital Asset [Member] | Fair Value, Recurring [Member]    
Fair value 992 997
Exchange Traded Funds Global Equity [Member]    
Fair value 34 32
Exchange Traded Funds Global Equity [Member] | Fair Value, Recurring [Member]    
Fair value 34 32
Exchange Traded Funds Option Strategy and Income [Member]    
Fair value 166 111
Exchange Traded Funds Option Strategy and Income [Member] | Fair Value, Recurring [Member]    
Fair value 166 111
Mutual Funds Fixed Income [Member]    
Fair value 9,734 9,692
Mutual Funds Fixed Income [Member] | Fair Value, Recurring [Member]    
Fair value 9,734 9,692
Mutual Funds Global Equity [Member]    
Fair value 890 841
Mutual Funds Global Equity [Member] | Fair Value, Recurring [Member]    
Fair value 890 841
Fair Value, Inputs, Level 1 [Member]    
Fair value 12,723 12,126
Total investments in trading securities: 12,774 12,188
Fair Value, Inputs, Level 1 [Member] | Corporate Debt Securities [Member]    
Corporate debt securities, fair value 51 62
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 12,774 12,188
Fair Value, Inputs, Level 1 [Member] | Fair Value, Nonrecurring [Member]    
Total investments carried at fair value [2] 0 0
Fair Value, Inputs, Level 1 [Member] | Equity Securities Domestic [Member] | Fair Value, Recurring [Member]    
Fair value 60 27
Fair Value, Inputs, Level 1 [Member] | Equity Securities International [Member] | Fair Value, Recurring [Member]    
Fair value 847 426
Fair Value, Inputs, Level 1 [Member] | Exchange Traded Funds Crypto and Digital Asset [Member] | Fair Value, Recurring [Member]    
Fair value 992 997
Fair Value, Inputs, Level 1 [Member] | Exchange Traded Funds Global Equity [Member] | Fair Value, Recurring [Member]    
Fair value 34 32
Fair Value, Inputs, Level 1 [Member] | Exchange Traded Funds Option Strategy and Income [Member] | Fair Value, Recurring [Member]    
Fair value 166 111
Fair Value, Inputs, Level 1 [Member] | Mutual Funds Fixed Income [Member] | Fair Value, Recurring [Member]    
Fair value 9,734 9,692
Fair Value, Inputs, Level 1 [Member] | Mutual Funds Global Equity [Member] | Fair Value, Recurring [Member]    
Fair value 890 841
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 [2] 0 0
Fair Value, Inputs, Level 2 [Member] | Equity Securities Domestic [Member] | Fair Value, Recurring [Member]    
Fair value 0 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] | Exchange Traded Funds Crypto and Digital Asset [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 0
Fair Value, Inputs, Level 2 [Member] | Exchange Traded Funds Option Strategy and Income [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 842 1,576
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]    
Total investments carried at fair value 842 1,576
Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member]    
Total investments carried at fair value [2] 1,828 189
Fair Value, Inputs, Level 3 [Member] | Equity Securities Domestic [Member] | Fair Value, Recurring [Member]    
Fair value 0 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] | Exchange Traded Funds Crypto and Digital Asset [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 0
Fair Value, Inputs, Level 3 [Member] | Exchange Traded Funds Option Strategy and Income [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] Other investments include equity securities without readily determinable fair values that were adjusted as a result of the measurement alternative on dates during the three months ended September 30, 2025. These securities are classified as level 3 due to the infrequency of the observable price changes and/or restrictions on the shares.