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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
6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Expected price volatility 160.41% 164.31%
Expected term (Year) 6 years 5 months 12 days 6 years 2 months 8 days
Risk-free interest rate 1.65% 1.09%
Dividend yield 0.00% 0.00%
Weighted-average fair value of options granted during the period (in dollars per share) $ 0.29 $ 0.90