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Note 3 - Investments - Components of Investments (Details) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2024
Mar. 31, 2023
Jun. 30, 2023
Cost $ 12,000,000   $ 12,000,000   $ 19,601,000
Unrealized gains losses (689,000)   (689,000)    
Equity Securities, FV-NI 11,311,000   11,311,000   13,205,000
Corporate debt securities (65,000) $ 0 (20,000) $ 0  
Total trading securities at fair value 12,215,000   12,215,000   19,601,000
Total trading securities at fair value (709,000)   (709,000)   (6,396,000)
Total trading securities at fair value 11,506,000   11,506,000   13,205,000
Unrealized gains (losses) on equity securities 5,863,000 $ 283,000 5,699,000 $ (2,586,000) (6,396,000)
Equity Securities, FV-NI 11,311,000   11,311,000   13,205,000
Amortized cost 6,651,000 [1]   6,651,000 [1]   7,729,000
Debt Securities, Available-for-Sale, Total [1] 5,190,000   5,190,000    
Allowance for credit losses 0   0   0
Corporate debt securities, cost [2] 1,000,000   1,000,000   1,000,000
Corporate debt securities, gains [2] 0   0   0
Corporate debt securities, losses [2] (157,000)   (157,000)   (232,000)
Corporate debt securities, fair value [2] 843,000   843,000   768,000
Corporate debt securities [2] 157,000   157,000   0
Convertible Debt Securities [Member]          
Amortized cost 6,651,000   6,651,000   7,729,000
Gross unrealized gains in other comprehensive income (loss) 1,052,000   1,052,000   1,707,000
Gross unrealized losses in other comprehensive income (loss) 0   0   0
Gross unrealized losses in net investment income (loss) (2,513,000) [3]   (2,513,000) [3]   (2,428,000) [4]
Debt Securities, Available-for-Sale, Total 5,190,000   5,190,000   7,008,000
Allowance for credit losses 0   0   0
Corporate Debt Securities [Member]          
Corporate debt securities, cost 215,000   215,000   0
Corporate debt securities (20,000)        
Corporate debt securities, fair value 195,000   195,000   0
Total trading securities at fair value         0
Equity Securities International [Member]          
Cost 746,000   746,000   6,679,000
Unrealized gains losses (335,000)   (335,000)    
Equity Securities, FV-NI 411,000   411,000   778,000
Unrealized gains (losses) on equity securities         (5,901,000)
Equity Securities, FV-NI 411,000   411,000   778,000
Equity Securities Domestic [Member]          
Cost 45,000   45,000   45,000
Unrealized gains losses (45,000)   (45,000)    
Equity Securities, FV-NI 0   0   0
Unrealized gains (losses) on equity securities         (45,000)
Equity Securities, FV-NI 0   0   0
Mutual Funds Fixed Income [Member]          
Cost 10,280,000   10,280,000   11,947,000
Unrealized gains losses (209,000)   (209,000)    
Equity Securities, FV-NI 10,071,000   10,071,000   11,642,000
Unrealized gains (losses) on equity securities         (305,000)
Equity Securities, FV-NI 10,071,000   10,071,000   11,642,000
Mutual Funds Global Equity [Member]          
Cost 929,000   929,000   930,000
Unrealized gains losses (100,000)   (100,000)    
Equity Securities, FV-NI 829,000   829,000   785,000
Unrealized gains (losses) on equity securities         (145,000)
Equity Securities, FV-NI $ 829,000   $ 829,000   $ 785,000
[1] Principal payments of $750,000 are due quarterly with a final maturity date 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 within net investment income (loss) on the Consolidated Statements of Operations.
[4] Represents changes in unrealized gains and losses related to embedded derivatives included within net investment income (loss) on the Consolidated Statements of Operations.