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Note 2 - Summary of Significant Accounting Policies - Intangible Assets (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Intangible assets | $ 1,770 | $ 1,770
Less accumulated amortization | (1,028) | (929)
Total | 742 | 841
Trade Names [Member] |  |
Intangible assets | 900 | 900
Patents [Member] |  |
Intangible assets | $ 870 | $ 870

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