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Note 12 - Share-based Compensation - Stock Options Outstanding (Details)
 6 Months Ended
Jun. 30, 2026
$ / shares
shares
Outstanding, shares (in shares) | shares 8,180,495
Outstanding, weighted average remaining contractual life (Year) 7 years 3 months 18 days
Outstanding, weighted average exercise price (in dollars per share) $ 4.61
xercisable, shares (in shares) | shares 3,436,681
Exercisable, weighted average remaining contractual life (Year) 5 years 7 months 6 days
Exercise Price Range 1 [Member]  
Lower range limit (in dollars per share) $ 1
Upper range limit (in dollars per share) $ 1.99
Outstanding, shares (in shares) | shares 51,443
Outstanding, weighted average remaining contractual life (Year) 6 years 7 months 6 days
Outstanding, weighted average exercise price (in dollars per share) $ 1.64
xercisable, shares (in shares) | shares 48,318
Exercisable, weighted average remaining contractual life (Year) 6 years 7 months 6 days
Exercise Price Range 2 [Member]  
Lower range limit (in dollars per share) $ 2
Upper range limit (in dollars per share) $ 2.99
Outstanding, shares (in shares) | shares 2,016,923
Outstanding, weighted average remaining contractual life (Year) 6 years 4 months 24 days
Outstanding, weighted average exercise price (in dollars per share) $ 2.75
xercisable, shares (in shares) | shares 1,537,218
Exercisable, weighted average remaining contractual life (Year) 6 years 4 months 24 days
Exercise Price Range 3 [Member]  
Lower range limit (in dollars per share) $ 3
Upper range limit (in dollars per share) $ 3.99
Outstanding, shares (in shares) | shares 223,107
Outstanding, weighted average remaining contractual life (Year) 3 years 6 months
Outstanding, weighted average exercise price (in dollars per share) $ 3.67
xercisable, shares (in shares) | shares 206,233
Exercisable, weighted average remaining contractual life (Year) 3 years 1 month 6 days
Exercise Price Range 4 [Member]  
Lower range limit (in dollars per share) $ 4
Upper range limit (in dollars per share) $ 4.99
Outstanding, shares (in shares) | shares 2,764,219
Outstanding, weighted average remaining contractual life (Year) 7 years 1 month 6 days
Outstanding, weighted average exercise price (in dollars per share) $ 4.33
xercisable, shares (in shares) | shares 1,229,019
Exercisable, weighted average remaining contractual life (Year) 5 years 4 months 24 days
Exercise Price Range 5 [Member]  
Lower range limit (in dollars per share) $ 5
Upper range limit (in dollars per share) $ 5.99
Outstanding, shares (in shares) | shares 2,168,536
Outstanding, weighted average remaining contractual life (Year) 8 years 3 months 18 days
Outstanding, weighted average exercise price (in dollars per share) $ 5.72
xercisable, shares (in shares) | shares 272,101
Exercisable, weighted average remaining contractual life (Year) 5 years 6 months
Exercise Price Range 6 [Member]  
Lower range limit (in dollars per share) $ 6
Upper range limit (in dollars per share) $ 10
Outstanding, shares (in shares) | shares 956,267
Outstanding, weighted average remaining contractual life (Year) 8 years 4 months 24 days
Outstanding, weighted average exercise price (in dollars per share) $ 7.24
xercisable, shares (in shares) | shares 143,792
Exercisable, weighted average remaining contractual life (Year) 3 years 1 month 6 days