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Note 10 - Stockholders' Equity - Options Granted under Company's Stock Incentive Plans, Valuation Assumptions and Fair Values (Details) - $ / shares
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Average risk-free interest rate 4.36% 4.19%
Expected dividend yield 0.00% 0.00%
Expected life (average, in years) (Year) 3 years 1 month 6 days 3 years
Granted, weighted average exercise price (in dollars per share) $ 1.52 $ 2.16
Weighted average fair value (in dollars per share) $ 0.86 $ 1.14
Minimum [Member]    
Expected volatility 83.35% 72.69%
Maximum [Member]    
Expected volatility 113.87% 77.53%