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Note 11 - Income Taxes - Schedule of Deferred Income Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
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Income Tax Disclosure [Abstract] |  |
Accrued expenses | $ 122 | $ 128
Depreciation | 82 | 245
Lease liability | 25 | 55
Net operating loss carryforwards | 27,383 | 24,703
Stock compensation | 1,216 | 1,470
Capitalized research and development costs | 3,771 | 2,515
Total deferred tax assets | 32,599 | 29,116
Operating right-of-use asset | 23 | 52
Prepaid expense | 108 | 112
Total deferred tax liabilities | 131 | 164
Net deferred tax asset | 32,468 | 28,952
Valuation allowance | (32,468) | (28,952)
Net deferred taxes | $ 0 | $ 0

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