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Note 6 - Intangible Digital Assets (Details Textual)
3 Months Ended 6 Months Ended
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Payment for Acquisition, Crypto Asset $ 5,000,000   $ 5,000,000 $ (0)
Crypto Asset, Unrealized Gain (Loss), Nonoperating 79,000 $ 0 $ 79,000 $ 0
Proceeds from Disposal, Crypto Asset $ 0      
Bitcoin [Member]        
Crypto Asset, Number of Units 43   43  
Crypto Asset, Cost $ 5,000,000   $ 5,000,000  
Crypto Asset, Fair Value $ 4,900,000   $ 4,900,000