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Note 6 - Other Accrued Expenses (Details Textual) - USD ($)
Sep. 30, 2025
Jun. 30, 2025
Accounts and Other Receivables, Net, Current $ 1,077,000 $ 1,036,000
HIVE Blockchain Technologies Ltd. [Member]    
Accounts and Other Receivables, Net, Current $ 231,000 $ 239,000