v3.25.2
Note 11 - Benefit Plans - Assumptions of Stock Options (Details)
6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Expected dividend yield 0.00% 0.00%
Minimum [Member]    
Expected stock price volatility 103.78% 97.78%
Risk-free interest rate 4.05% 4.04%
Expected term of options (in years) (Year) 5 years 5 years
Maximum [Member]    
Expected stock price volatility 110.25% 110.82%
Risk-free interest rate 4.24% 4.58%
Expected term of options (in years) (Year) 6 years 3 months 10 years