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Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Inventory, Raw Materials, Gross | $ 23,000 |  | $ 23,000
Inventory, Finished Goods, Gross | 14,000 |  | $ 14,000
Research and Development Expense | 5,869,000 | $ 7,395,000 |
Grant Funding on Conditional Grants [Member] |  |  |
Research and Development Expense | $ 300,000 | $ 0 |
Reverse Recapitalization [Member] | Clene Nanomedicine Contingent Earn-out [Member] |  |  |
Business Combination, Contingent Earnout Shares, Milestone One (in shares) | 3,338,483 |  |
Business Combination, Contingent Earnout, Milestone One, Minimum Price (in dollars per share) | $ 15 |  |
Business Combination, Contingent Earnout, Milestone One, Consecutive Trading Days (Day) | 20 days |  |
Business Combination, Contingent Earnout, Milestone One, Trading Day Period (Day) | 30 days |  |
Business Combination, Contingent Earnout, Milestone One, Period (Year) | 3 years |  |
Business Combination, Contingent Earnout Shares, Milestone Two (in shares) | 2,503,851 |  |
Business Combination, Contingent Earnout, Milestone Two, Minimum Price (in dollars per share) | $ 20 |  |
Business Combination, Contingent Earnout, Milestone Two, Consecutive Trading Days (Day) | 20 days |  |
Business Combination, Contingent Earnout, Milestone Two, Trading Day Period (Day) | 30 days |  |
Business Combination, Contingent Earnout, Milestone Two, Period (Year) | 5 years |  |
Business Combination, Contingent Earnout, Milestone Two, Change of Control Period (Year) | 5 years |  |
Reverse Recapitalization [Member] | Initial Stockholders Contingent Earn-out [Member] |  |  |
Business Combination, Contingent Earnout Shares, Milestone One (in shares) | 375,000 |  |
Business Combination, Contingent Earnout Shares, Milestone Two (in shares) | 375,000 |  |
Equipment [Member] | Minimum [Member] |  |  |
Property, Plant and Equipment, Useful Life (Year) | 3 years |  |
Equipment [Member] | Maximum [Member] |  |  |
Property, Plant and Equipment, Useful Life (Year) | 5 years |  |
Furniture and Fixtures [Member] | Minimum [Member] |  |  |
Property, Plant and Equipment, Useful Life (Year) | 3 years |  |
Furniture and Fixtures [Member] | Maximum [Member] |  |  |
Property, Plant and Equipment, Useful Life (Year) | 7 years |  |
Computer Equipment [Member] | Minimum [Member] |  |  |
Property, Plant and Equipment, Useful Life (Year) | 2 years |  |
Computer Equipment [Member] | Maximum [Member] |  |  |
Property, Plant and Equipment, Useful Life (Year) | 5 years |  |

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