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Note 9 - Income Taxes - Schedule of Effective Income Tax Reconciliation (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
U.S. federal statutory tax rate $ (19,104)    
U.S. federal statutory tax rate, percent 21.00% 21.00% 21.00%
Stock compensation $ 3,580    
Stock compensation, percent (4.00%) (5.70%) 0.20%
Section 162(m) limitation $ 0    
Section 162(m) limitation, percent 0.00% (0.20%) 0.00%
Change in fair value of warrant liabilities $ 0    
Change in fair value of warrant liabilities, percent 0.00% 93.30% 0.00%
SEC settlement payment $ 0    
SEC settlement payment, percent 0.00% (34.50%) 0.00%
Change in valuation allowance $ 15,207    
Change in valuation allowance, percent (16.70%) (79.40%) (24.00%)
Research and development credits $ (1,021)    
Research and development credits, percent 1.10% 15.40% 5.10%
Tax attribute expiration $ 922    
Tax attribute expiration, percent (1.00%) (4.10%) 0.00%
Uncertain tax positions $ 409    
Uncertain tax positions, percent (0.40%) (6.10%) (2.00%)
State tax, net of federal benefit $ 0    
State tax, net of federal benefit, percent 0.00% 0.00% 0.00%
Other $ 7    
Other, percent 0.00% 0.30% (0.30%)
Effective income tax rate $ 0    
Effective income tax rate, percent 0.00% 0.00% 0.00%