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Note 10 - Capital Stock and Stock-based Compensation - Monte Carlo Assumptions (Details) - Monte-Carlo Valuation Simulation [Member] - Restricted Stock Units (RSUs) [Member]
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Volatility 65.10% 80.60%
Risk-free interest rate 0.30% 0.20%
Correlation coefficient 35.70% 31.50%
Dividend Yield 0.00% 0.00%