Annual report [Section 13 and 15(d), not S-K Item 405]

Product warranty - Schedule of Product Warranty Reserve (Details)

v3.25.1
Product warranty - Schedule of Product Warranty Reserve (Details) - USD ($)
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Guarantees [Abstract]    
Product warranty period 1 year  
Schedule of Product Warranty Reserve [Roll Forward]    
Warranty reserve, beginning balance $ 142,000 $ 137,800
Warranty provision for units sold 257,898 286,391
Costs of warranty incurred (276,898) (282,191)
Warranty reserve, ending balance $ 123,000 $ 142,000