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Note 11 - Share-based Compensation - Options, Valuation Assumptions (Details)
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dividend yield 0.00% 0.00%
Expected life in years (Year) 10 years 10 years
Minimum [Member]    
Risk-free interest rate 1.63% 0.93%
Expected volatility 54.44% 54.61%
Maximum [Member]    
Risk-free interest rate 3.67% 1.69%
Expected volatility 55.41% 55.39%