XML 56 R44.htm IDEA: XBRL DOCUMENT v3.25.2
Note 3 - Investments (Details Textual) - USD ($)
$ / shares in Units, shares in Millions
 1 Months Ended 12 Months Ended
Jan. 01, 2024
Jan. 12, 2021
Jan. 31, 2024
Jun. 30, 2025
Jun. 30, 2024
Mar. 31, 2021
Jan. 31, 2021
Investment Owned, Fair Value       $ 13,800,000      
Investment Owned, Cost       $ 17,000,000      
Value of Fair Value Investments to Company Assets, Percent       28.60%      
Equity Securities without Readily Determinable Fair Value, Amount       $ 1,349,000 $ 1,687,000    
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss [1]       948,000 868,000    
Interest Receivable       40,000 13,000    
Accounts and Other Receivables, Net, Current       1,036,000 1,047,000    
Accounts Receivable, Allowance for Credit Loss       0 0    
Debt Securities, Available-for-Sale, Total [2]       1,576,000      
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax       (4,000) 136,000    
Equity Securities, FV-NI       12,126,000 10,885,000    
Realized Gain (Loss) on Principal Payment Proceeds       610,000 1,100,000    
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss)       (12,000)      
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment and Tax       (5,000)      
Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Period Increase (Decrease)       80,000 100,000    
Debt Securities, Available-for-Sale, Periodic Principal Payments         750,000    
Equity Securities without Readily Determinable Fair Value, Upward Price Adjustment, Cumulative Amount       2,600,000      
Equity Securities without Readily Determinable Fair Value, Downward Price Adjustment, Cumulative Amount       5,400,000      
Equity Securities Without Readily Determinable Fair Values, Unrealized Gain (Loss)       $ (362,000) (1,000,000)    
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]       Investment Income, Net      
Fair Value, Inputs, Level 3 [Member]              
Equity Securities, FV-NI       $ 0 0    
Warrant [Member]              
Equity Securities, FV-NI   $ 5,900,000          
Warrant [Member] | Investment Income, Net              
Equity Securities, FV-NI, Realized Loss     $ 5,900,000        
U S Global Investors Funds [Member]              
Investment Owned, Fair Value       10,500,000 10,500,000    
HIVE Blockchain Technologies Ltd. [Member]              
Investment Owned, Fair Value       1,600,000 4,400,000    
Realized Gain (Loss) on Principal Payment Proceeds       610,000 1,100,000    
HIVE Blockchain Technologies Ltd. [Member] | Convertible Securities [Member]              
Investment Owned, Balance, Principal Amount       1,600,000     $ 15,000,000
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       1,600,000 4,400,000    
Investment, Principal Repayments Recievable       750,000      
Interest Receivable       15,000      
Accounts and Other Receivables, Net, Current         0    
Accounts Receivable, Allowance for Credit Loss       0 0    
HIVE Blockchain Technologies Ltd. [Member] | Unsecured Convertible Debentures [Member]              
Debt Securities, Available-for-Sale, Total       $ 1,600,000 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 Securities [Member]              
Debt Instrument, Interest Rate, Stated Percentage             8.00%
HIVE Blockchain Technologies Ltd. [Member] | Unsecured Convertible Debentures [Member] | Convertible Debt Securities [Member]              
Debt Instrument, Convertible, Conversion Price (in dollars per share)       $ 11.7     $ 2.34
HIVE Blockchain Technologies Ltd. [Member] | Common Shares Purchase Warrants [Member]              
Investment, Common Share Purchase Warrants (in shares)           5  
HIVE Blockchain Technologies Ltd. [Member] | Warrant [Member]              
Equity Securities, FV-NI     $ 5,900,000        
Equity Securities, FV-NI, Realized Loss $ 5,900,000            
The Sonar Company [Member]              
Equity Securities without Readily Determinable Fair Value, Amount       $ 0 $ 362,000    
Investment Owned, Direct Percentage       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 in January 2026.