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Note 12 - Share-based Compensation - Summary of Stock Option Valuation Assumptions (Details) - $ / shares
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Forfeiture rate 0.00% 0.00%
Weighted-average fair value of options granted (in dollars per share) $ 0.88 $ 2.57
Share-Based Payment Arrangement, Option [Member]    
Expected stock price volatility 49.00% 50.00%
Risk-free interest rate 2.47% 0.90%
Expected dividend yield 0.00% 0.00%
Expected life of options - years (Year) 5 years 11 months 15 days 5 years 8 months 26 days