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Note 8 - Capital Stock and Stock-based Compensation - Black Scholes Assumptions (Details) - Black Scholes Option Pricing Model [Member] - Share-Based Payment Arrangement, Option [Member]
9 Months Ended
Sep. 30, 2022
Volatility 63.70%
Risk-free interest rate 1.80%
Correlation coefficient1 41.10%
Dividend yield 0.00%