Quarterly report pursuant to Section 13 or 15(d)

Note 5 - Stock Incentive Plan - Options Outstanding (Details)

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Note 5 - Stock Incentive Plan - Options Outstanding (Details)
 3 Months Ended
Mar. 31, 2024
$ / shares
shares
Number of shares subject to options outstanding (in shares) 2,119,001
Weighted-average remaining contractual term (Year) 6 years 3 months
Number of shares, exercisable (in shares) 1,575,423
Weighted-average remaining contractual term, exercisable (Year) 5 years 6 months 3 days
Price Range 1 [Member]  
Lower exercise price (in dollars per share) | $ / shares $ 0.001
Upper exercise price (in dollars per share) | $ / shares $ 5
Number of shares subject to options outstanding (in shares) 1,381,895
Weighted-average remaining contractual term (Year) 6 years 8 months 23 days
Number of shares, exercisable (in shares) 887,939
Weighted-average remaining contractual term, exercisable (Year) 5 years 8 months 23 days
Price Range 2 [Member]  
Lower exercise price (in dollars per share) | $ / shares $ 5.01
Upper exercise price (in dollars per share) | $ / shares $ 10
Number of shares subject to options outstanding (in shares) 617,942
Weighted-average remaining contractual term (Year) 5 years 3 months
Number of shares, exercisable (in shares) 568,320
Weighted-average remaining contractual term, exercisable (Year) 5 years 1 month 2 days
Price Range 3 [Member]  
Lower exercise price (in dollars per share) | $ / shares $ 10.01
Upper exercise price (in dollars per share) | $ / shares $ 15
Number of shares subject to options outstanding (in shares) 113,039
Weighted-average remaining contractual term (Year) 5 years 10 months 2 days
Number of shares, exercisable (in shares) 113,039
Weighted-average remaining contractual term, exercisable (Year) 5 years 10 months 2 days
Price Range 4 [Member]  
Lower exercise price (in dollars per share) | $ / shares $ 15.01
Upper exercise price (in dollars per share) | $ / shares $ 20
Number of shares subject to options outstanding (in shares) 6,125
Weighted-average remaining contractual term (Year) 5 years 10 months 2 days
Number of shares, exercisable (in shares) 6,125
Weighted-average remaining contractual term, exercisable (Year) 5 years 10 months 2 days