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Note 8 - Long-term Investments - Schedule of Level 3 Investments (Details) - USD ($) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2025 | Dec. 31, 2024
Balance, beginning of period | $ 1,200,000 | $ 0
Transfer in | 0 | 1,200,000
Unrealized loss | (44,000) | 0
Ending balance | 1,156,000 | 1,200,000
Amount of unrealized loss for the period included in income relating to assets held at the end of the reporting period | $ (44,000) | $ 0

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