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Note 15 - Equity-based Compensation - Weighted-average Assumptions Used in Determining the Value of Options Granted to Employees and Directors (Details) - Employees and Directors [Member] - $ / shares
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Expected price volatility 154.00% 158.00%
Expected term (Year) 6 years 7 months 28 days 6 years 5 months 12 days
Risk-free interest rate 3.57% 2.36%
Dividend yield 0.00% 0.00%
Weighted-average fair value of options granted during the period (in dollars per share) $ 1.29 $ 9.22