XML 43 R34.htm IDEA: XBRL DOCUMENT v3.25.3
Note 2 - Investments (Details Textual) - USD ($)
 3 Months Ended
Jan. 12, 2021
Sep. 30, 2025
Sep. 30, 2024
Jun. 30, 2025
Mar. 31, 2021
Jan. 31, 2021
Investment Owned, Fair Value   $ 13,600,000        
Investment Owned, Cost   $ 16,300,000        
Value of Fair Value Investments to Company Assets, Percent   27.80%        
Equity Securities without Readily Determinable Fair Value, Amount   $ 2,677,000 $ 1,687,000 $ 1,349,000    
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss [1]   953,000   948,000    
Debt Securities, Available-for-Sale, Total [2]   842,000        
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax   (3,000) 18,000      
Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Period Increase (Decrease)   5,000 23,000      
Debt Securities, Available-for-Sale, Periodic Principal Payments   750,000        
Interest Receivable   35,000   40,000    
Equity Securities without Readily Determinable Fair Value, Downward Price Adjustment, Cumulative Amount   1,300,000   5,400,000    
Equity Securities without Readily Determinable Fair Value, Upward Price Adjustment, Cumulative Amount   3,900,000        
Realized Gain (Loss) on Principal Payment Proceeds   71,000 203,000      
Equity Securities Without Readily Determinable Fair Values, Unrealized Gain (Loss)   1,300,000 $ 0      
U S Global Investors Funds [Member]            
Investment Owned, Fair Value   10,600,000   10,500,000    
HIVE Blockchain Technologies Ltd. [Member] | Unsecured Convertible Debentures [Member]            
Investment Owned, Balance, Principal Amount   842,000        
Debt Securities, Available-for-Sale, Total   $ 842,000   1,600,000    
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] | Common Shares Purchase Warrants [Member]            
Investment, Common Share Purchase Warrants (in shares)         5,000,000  
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)           $ 3
HIVE Blockchain Technologies Ltd. [Member] | Common Stock [Member]            
Investment Owned, Net Assets, Percentage   0.10%        
HIVE Blockchain Technologies Ltd. [Member] | Common Stock [Member] | Fair Value, Inputs, Level 1 [Member]            
Investment Owned, Fair Value   $ 60,000   $ 27,000    
Investment Owned, Cost   $ 41,000        
Investment Owned, Balance, Shares (in shares)   15,000        
HIVE Blockchain Technologies Ltd. [Member] | Convertible Securities [Member]            
Investment Owned, Balance, Principal Amount           $ 15,000,000
HIVE Blockchain Technologies Ltd. [Member] | Convertible Debt Securities [Member] | Unsecured Convertible Debentures [Member]            
Debt Instrument, Interest Rate, Stated Percentage         8.00%  
Debt Instrument, Convertible, Conversion Price (in dollars per share)   $ 11.7       $ 2.34
[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 in January 2026.