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Warranty reserves (Details) - USD ($)
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Movement in Standard Product Warranty Accrual [Roll Forward]    
Warranty reserves at beginning of the period $ 1,301,796 $ 1,371,412
Reserves provided 1,219,353 1,070,762
Payments for warranty costs and other (654,894) (1,140,378)
Warranty reserves at end of the period $ 1,866,255 $ 1,301,796