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Note 2 - Investments - Components of Investments (Details) - USD ($)
 3 Months Ended 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Cost $ 12,760,000   $ 12,748,000  
Unrealized gains (losses) (37,000)   (622,000)  
Fair value 12,723,000   12,126,000  
Corporate debt securities, Unrealized gains (losses) (11,000) $ 40,000    
Total trading securities at fair value, cost 12,975,000   12,963,000  
Total trading securities at fair value, Unrealized gains (losses) (201,000)   (775,000)  
Total trading securities at fair value 12,774,000   12,188,000  
Amortized cost 3,334,000 [1]   3,993,000  
Debt Securities, Available-for-Sale, Total [1] 842,000      
Allowance for credit losses 0   0  
Corporate debt securities, amortized cost [2] 1,000,000   1,000,000  
Corporate debt securities, allowance for credit losses (47,000) [2] $ (109,000) (52,000) [2] $ (132,000)
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss [2] 953,000   948,000  
Corporate debt securities, gross unrecognized holding gains [2] 0   0  
Corporate debt securities, gross unrecognized holding losses [2] 0   0  
Corporate debt securities, fair value [2] 953,000   948,000  
Convertible Debt Securities [Member]        
Amortized cost 3,334,000   3,993,000  
Gross unrealized gains in other comprehensive income (loss) 50,000   125,000  
Gross unrealized losses in other comprehensive income (loss) 0   0  
Gross unrealized losses in net investment income (loss) [3] (2,542,000)   (2,542,000)  
Debt Securities, Available-for-Sale, Total 842,000   1,576,000  
Allowance for credit losses 0   0  
Corporate Debt Securities [Member]        
Corporate debt securities, cost 215,000   215,000  
Corporate debt securities, Unrealized gains (losses) (164,000)   (153,000)  
Corporate debt securities, fair value 51,000   62,000  
Equity Securities Domestic [Member]        
Cost 87,000   87,000  
Unrealized gains (losses) (27,000)   (60,000)  
Fair value 60,000   27,000  
Equity Securities International [Member]        
Cost 761,000   761,000  
Unrealized gains (losses) 86,000   (335,000)  
Fair value 847,000   426,000  
Exchange Traded Funds Crypto and Digital Asset [Member]        
Cost 899,000   967,000  
Unrealized gains (losses) 93,000   30,000  
Fair value 992,000   997,000  
Exchange Traded Funds Global Equity [Member]        
Cost 30,000   30,000  
Unrealized gains (losses) 4,000   2,000  
Fair value 34,000   32,000  
Exchange Traded Funds Option Strategy and Income [Member]        
Cost 185,000   105,000  
Unrealized gains (losses) (19,000)   6,000  
Fair value 166,000   111,000  
Mutual Funds Fixed Income [Member]        
Cost 9,869,000   9,869,000  
Unrealized gains (losses) (135,000)   (177,000)  
Fair value 9,734,000   9,692,000  
Mutual Funds Global Equity [Member]        
Cost 929,000   929,000  
Unrealized gains (losses) (39,000)   (88,000)  
Fair value $ 890,000   $ 841,000  
[1] Principal payments of $750,000 are due quarterly with a final maturity in January 2026.
[2] Held-to-maturity debt investments 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.