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Note 6 - Other Accrued Expenses (Details Textual) - USD ($)
Mar. 31, 2025
Jun. 30, 2024
Accounts and Other Receivables, Net, Current $ 1,033,000 $ 1,047,000
HIVE Blockchain Technologies Ltd. [Member]    
Accounts and Other Receivables, Net, Current $ 279,000 $ 207,000