Note 12 - Share-based Compensation - Assumptions (Details) - $ / shares |
6 Months Ended | 12 Months Ended | |
---|---|---|---|
Dec. 31, 2022 |
Dec. 31, 2023 |
Jun. 30, 2022 |
|
Weighted average fair value (in dollars per share) | $ 0.26 | $ 0.32 | $ 0.55 |
Options issued (in shares) | 4,235,000 | 21,665,273 | 3,269,100 |
Expected term (in years) (Year) | 5 years | 5 years | 5 years |
Minimum [Member] | |||
Exercise price (in dollars per share) | $ 0.33 | $ 0.24 | $ 0.28 |
Risk-free rate | 2.97% | 3.84% | 0.73% |
Volatility | 100.00% | 93.00% | 99.00% |
Maximum [Member] | |||
Exercise price (in dollars per share) | $ 0.36 | $ 0.69 | $ 0.79 |
Risk-free rate | 3.00% | 4.46% | 3.24% |
Volatility | 101.00% | 108.00% | 100.00% |