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Note 10 - Share-based Compensation - Summary of Stock Option Valuation Assumptions (Details) - $ / shares
6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Forfeiture rate 0.00% 0.00%
Weighted-average fair value of options granted (in dollars per share) $ 1.32 $ 2.46
Share-Based Payment Arrangement, Option [Member]    
Expected stock price volatility 49.00% 50.00%
Risk-free interest rate 1.09% 0.92%
Expected dividend yield 0.00% 0.00%
Expected life of options (Year) 1 year 9 months 25 days 5 years 8 months 12 days