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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, 2020
Volatility 58.30%
Risk-free interest rate 0.30%
Expected holding period (Year) 4 years 4 months 24 days
Dividend Yield 0.00%