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Note 2 - Investments (Details Textual)
$ / shares in Units, shares in Millions
 3 Months Ended 9 Months Ended
Jan. 12, 2021
USD ($)
Mar. 31, 2025
USD ($)
$ / shares
Mar. 31, 2024
USD ($)
Mar. 31, 2025
USD ($)
$ / shares
Mar. 31, 2024
USD ($)
Jan. 31, 2025
USD ($)
Jun. 30, 2024
USD ($)
Mar. 31, 2021
shares
Jan. 31, 2021
USD ($)
$ / shares
Jan. 31, 2021
$ / shares
Investment Owned, Fair Value   $ 13,300,000   $ 13,300,000            
Investment Owned, Cost   $ 16,500,000   $ 16,500,000            
Value of Fair Value Investments to Company Assets, Percent   27.30%   27.30%            
Equity Securities without Readily Determinable Fair Value, Amount   $ 1,687,000 $ 1,114,000 $ 1,687,000 $ 1,114,000   $ 1,687,000      
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss [1]   929,000   929,000     868,000      
Debt Securities, Available-for-Sale, Total [2]   2,302,000   2,302,000            
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax   (18,000) 79,000 1,000 199,000          
Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Period Increase (Decrease)   3,000 20,000 61,000 75,000          
Debt Securities, Available-for-Sale, Periodic Principal Payments       750,000            
Interest Receivable   25,000   25,000     13,000      
Equity Securities without Readily Determinable Fair Value, Downward Price Adjustment, Cumulative Amount   5,000,000   5,000,000     1,700,000      
Equity Securities without Readily Determinable Fair Value, Upward Price Adjustment, Cumulative Amount   2,500,000   2,500,000            
Realized Gain (Loss) on Principal Payment Proceeds   134,000 267,000 507,000 906,000          
Equity Securities Without Readily Determinable Fair Values, Unrealized Gain (Loss)   0 $ (240,000) 0 $ (1,000,000)          
U S Global Investors Funds [Member]                    
Investment Owned, Fair Value   10,500,000   10,500,000     10,500,000      
HIVE Blockchain Technologies Ltd. [Member] | Common Stock [Member]                    
Investment Owned, Net Assets, Percentage           0.10%        
HIVE Blockchain Technologies Ltd. [Member] | Convertible Securities [Member]                    
Investment Owned, Balance, Principal Amount                 $ 15,000,000  
HIVE Blockchain Technologies Ltd. [Member] | Fair Value, Inputs, Level 1 [Member] | Common Stock [Member]                    
Investment Owned, Fair Value           $ 15,000        
Investment Owned, Cost           $ 31,000        
HIVE Blockchain Technologies Ltd. [Member] | Warrants and Convertible Debentures [Member] | Fair Value, Inputs, Level 3 [Member] | Available-for-sale Securities and Equity Securities [Member]                    
Investment Owned, Fair Value   2,300,000   2,300,000     4,400,000      
HIVE Blockchain Technologies Ltd. [Member] | Unsecured Convertible Debentures [Member]                    
Investment Owned, Balance, Principal Amount   2,300,000   2,300,000            
Debt Securities, Available-for-Sale, Total   $ 2,300,000   $ 2,300,000     4,400,000      
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax $ 6,900,000                  
HIVE Blockchain Technologies Ltd. [Member] | Unsecured Convertible Debentures [Member] | Estimate of Fair Value Measurement [Member]                    
Debt Securities, Available-for-Sale, Total $ 16,000,000                  
HIVE Blockchain Technologies Ltd. [Member] | Unsecured Convertible Debentures [Member] | Convertible Debt Securities [Member]                    
Debt Instrument, Interest Rate, Stated Percentage               8.00%    
Debt Instrument, Convertible, Conversion Price (in dollars per share) | $ / shares   $ 11.7   $ 11.7         $ 2.34  
HIVE Blockchain Technologies Ltd. [Member] | Common Shares Purchase Warrants [Member]                    
Investment, Common Share Purchase Warrants (in shares) | shares               5    
Class of Warrant or Right, Exercise Price of Warrants or Rights (in CAD per share) | $ / shares                   $ 3
The Sonar Company [Member]                    
Equity Securities without Readily Determinable Fair Value, Amount   $ 362,000   $ 362,000     $ 362,000      
Other Investments and Securities, at Cost   $ 175,000   $ 175,000            
Investment Owned, Direct Percentage   2.80%   2.80%            
[1] 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.
[2] Principal payments of $750,000 are due quarterly with a final maturity date in January 2026.