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Note 8 - Stock-Based Compensation - Summary of Stock Options (Details)
 6 Months Ended
Jun. 30, 2025
$ / shares
shares
Outstanding, options (in shares) | shares 7,638,458
Outstanding, weighted average exercise price (in dollars per share) | $ / shares $ 5.5
Granted, options (in shares) | shares 1,758,000
Strike price (in dollars per share) | $ / shares $ 1.35
Exercised, options (in shares) | shares 0
Exercised, weighted average exercise price (in dollars per share) | $ / shares $ 0
Canceled and forfeited, options (in shares) | shares (815,360)
Canceled and forfeited, weighted average exercise price (in dollars per share) | $ / shares $ 5.87
Outstanding, options (in shares) | shares 8,581,098
Outstanding, weighted average exercise price (in dollars per share) | $ / shares $ 4.62