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Note 12 - Stock-based Compensation - Stock Option Valuation Assumptions (Details) - Share-Based Payment Arrangement, Option [Member] - The 2021 Plan [Member]
3 Months Ended
Mar. 31, 2022
Expected life (in years) (Year) 6 years 1 month 9 days
Expected volatility 45.18%
Risk-free rate 2.16%