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Note 13 - Equity-based Compensation - Weighted-average Assumptions Used in Determining the Value of Options Granted to Employees and Directors (Details) - Employees and Directors [Member] - $ / shares
6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Expected price volatility 152.99% 160.41%
Expected term (Year) 6 years 9 months 21 days 6 years 5 months 12 days
Risk-free interest rate 3.47% 1.65%
Dividend yield 0.00% 0.00%
Weighted-average fair value of options granted during the period (in dollars per share) $ 1.61 $ 10.17