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Note 10 - Capital Stock and Stock-based Compensation - Black Scholes Assumptions (Details) - Black Scholes Option Pricing Model [Member] - Share-Based Payment Arrangement, Option [Member]
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Volatility 62.60% 65.10%
Risk-free interest rate 2.10% 0.30%
Correlation coefficient 41.50% 35.70%
Dividend yield 0.00% 0.00%