Quarterly report [Sections 13 or 15(d)]

Share-based compensation - Narrative (Details)

v3.25.3
Share-based compensation - Narrative (Details) - Plan
3 Months Ended 9 Months Ended
Jun. 27, 2025
shares
Jun. 18, 2025
shares
Sep. 30, 2025
USD ($)
shares
Sep. 30, 2024
USD ($)
Sep. 30, 2025
USD ($)
M
$ / shares
shares
Sep. 30, 2024
USD ($)
Share-based compensation            
Number of additional shares authorized | shares   108,612        
Shares authorized | shares   191,112        
Shares available for future grant | shares     14,682   14,682  
Maximum aggregate number of shares | shares 20,000          
Granted | shares         109,853  
Exercise price | $ / shares         $ 4.711  
Vesting period         10 years  
Aggregate grant date fair value | $         $ 413,950  
Variables used in the Black-Scholes option-pricing model            
Expected dividends | $         0  
Intrinsic value of options outstanding | $     $ 303,869   $ 303,869  
Minimum            
Variables used in the Black-Scholes option-pricing model            
Discount rates         3.88%  
Expected life         5 years 6 months  
Expected volatility         96.92%  
Fair market value | $ / shares         $ 4.71  
Maximum            
Variables used in the Black-Scholes option-pricing model            
Discount rates         4.0275%  
Expected life         6 years  
Expected volatility         99.57%  
Fair market value | $ / shares         $ 4.8  
Vesting over one year | Vesting of options entirely in a single tranche            
Share-based compensation            
Vesting percentage         100.00%  
Vesting over one year | Vesting of options in two tranches            
Share-based compensation            
Vesting percentage         33.333%  
Vesting after one year | Vesting of options in two tranches            
Share-based compensation            
Vesting percentage         66.667%  
Number of monthly installments | M         24  
Employee Stock Option            
Variables used in the Black-Scholes option-pricing model            
Share-based compensation expense | $     48,281 $ 94,302 $ 197,782 $ 382,219
Unrecognized compensation expense | $     $ 330,083   $ 330,083