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Note 11 - Equity Incentive Plan - Assumptions Used to Estimate Fair Value of Stock Options and Stock Appreciation Rights (Details) - $ / shares
6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Expected life (years) (Year) 4 years 6 months 4 years 6 months
Expected dividend yield 0.00% 0.00%
Fair value per option (in dollars per share) $ 0.1052 $ 0.1174
Minimum [Member]    
Risk free interest rate 3.90% 3.50%
Expected volatility 44.50% 48.70%
Maximum [Member]    
Risk free interest rate 4.60% 4.30%
Expected volatility 48.20% 49.40%