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Note 17 - Related Party Transactions (Details Textual) - USD ($)
 12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Equity Securities, FV-NI, Total $ 13,205,000 $ 14,300,000
Proceeds from Sale of Short-Term Investments 350,000 0
Payments to Acquire Short-Term Investments (0) 6,000,000
Equity Securities, FV-NI, Realized Gain (Loss) (453,000) 1,848,000
Other Accrued Liabilities, Current 1,274,000 1,831,000
Investment Owned, Fair Value 20,200,000  
Realized Gain (Loss) on Principal Payment Proceeds 1,700,000 2,200,000
Investment Income, Net 316,000 (6,174,000)
Equity Securities without Readily Determinable Fair Value, Amount 2,388,000 3,992,000
Equity Securities without Readily Determinable Fair Value, Upward Price Adjustment, Annual Amount 14,000 187,000
HIVE Blockchain Technologies Ltd. [Member]    
Investment Owned, Fair Value 7,300,000 11,100,000
Realized Gain (Loss) on Principal Payment Proceeds 1,700,000 2,200,000
Investment Income, Net 1,200,000  
The Sonar Company [Member]    
Equity Securities without Readily Determinable Fair Value, Amount 362,000 362,000
Payments to Acquire Equity Securities Without Readily Determinable Fair Value   75,000
Equity Securities without Readily Determinable Fair Value, Upward Price Adjustment, Annual Amount   187,000
Operating Lease, Lease Income 16,000 15,000
Receivables From Mutual Funds [Member]    
Receivables, Net, Current 1,100,000 1,600,000
U S Global Investors Funds [Member]    
Equity Securities, FV-NI, Total 12,400,000 12,800,000
Proceeds from Sale of Short-Term Investments 350,000  
Payments to Acquire Short-Term Investments   6,000,000
Investment Income, Dividends and Capital Gains 267,000 146,000
Equity Securities, FV-NI, Realized Gain (Loss) (13,000) 0
Mutual Funds [Member]    
Other Accrued Liabilities, Current   110,000
HIVE Blockchain Technologies Ltd. [Member]    
Investment Income, Net   1,600,000
Consulting Fees Income 120,000 120,000
Accounts Receivable, after Allowance for Credit Loss $ 43,000 $ 140,000