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Note 2 - Investments - Components of Investments (Details) - USD ($)
 3 Months Ended 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Cost $ 11,605,000   $ 11,605,000  
Unrealized gains (losses) (687,000)   (720,000)  
Fair value 10,918,000   10,885,000  
Corporate debt securities, Unrealized gains (losses) 40,000 $ 0    
Total trading securities at fair value, cost 11,820,000   11,820,000  
Total trading securities at fair value, Unrealized gains (losses) (654,000)   (727,000)  
Total trading securities at fair value 11,166,000   11,093,000  
Amortized cost 5,717,000 [1]   6,204,000  
Debt Securities, Available-for-Sale, Total [1] 3,742,000      
Allowance for credit losses 0   0  
Corporate debt securities [2] 1,000,000   1,000,000  
Corporate debt securities 109,000 [2] $ 205,000 132,000 [2] $ 0
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss [2] 891,000   868,000  
Corporate debt securities [2] 0   0  
Corporate debt securities [2] 0   0  
Corporate debt securities [2] 891,000   868,000  
Convertible Debt Securities [Member]        
Amortized cost 5,717,000   6,204,000  
Gross unrealized gains in other comprehensive income (loss) 560,000   740,000  
Gross unrealized losses in other comprehensive income (loss) 0   0  
Gross unrealized losses in net investment income (loss) [3] (2,535,000)   (2,530,000)  
Debt Securities, Available-for-Sale, Total 3,742,000   4,414,000  
Allowance for credit losses 0   0  
Corporate Debt Securities [Member]        
Corporate debt securities, cost 215,000   215,000  
Corporate debt securities, Unrealized gains (losses) 33,000   (7,000)  
Corporate debt securities, fair value 248,000   208,000  
Equity Securities International [Member]        
Cost 762,000   762,000  
Unrealized gains (losses) (415,000)   (327,000)  
Fair value 347,000   435,000  
Equity Securities Domestic [Member]        
Cost 45,000   45,000  
Unrealized gains (losses) (45,000)   (45,000)  
Fair value 0   0  
Mutual Funds Fixed Income [Member]        
Cost 9,869,000   9,869,000  
Unrealized gains (losses) (156,000)   (225,000)  
Fair value 9,713,000   9,644,000  
Mutual Funds Global Equity [Member]        
Cost 929,000   929,000  
Unrealized gains (losses) (71,000)   (123,000)  
Fair value $ 858,000   $ 806,000  
[1] Principal payments of $750,000 are due quarterly with a final maturity in January 2026.
[2] Held-to-maturity debt instruments are carried at amortized cost, net of allowance for credit losses, and the fair value is classified as Level 2 according to the fair value hierarchy.
[3] Represents changes in unrealized gains and losses related to embedded derivatives included in net investment income (loss) in the Consolidated Statements of Operations.