Warranty reserves (Tables)

3 Months Ended

12 Months Ended

Mar. 31, 2023

Dec. 31, 2022

Warranty reserves

Summary of the activity related to warranty reserves

	Three Months Ended		Year Ended
	March 31, 2023		December 31, 2022
Warranty reserves at beginning of the period	$	1,371,412	$	1,275,594
Reserves provided		242,720		1,156,027
Payments for warranty costs and other		(204,713)		(1,060,209)
Warranty reserves at end of the period	$	1,409,419	$	1,371,412

	2022		2021
Warranty reserves at January 1	$	1,275,594	$	963,204
Reserves provided		1,156,027		1,206,142
Payments for warranty costs and other		(1,060,209)		(893,752)
Warranty reserves at December 31	$	1,371,412	$	1,275,594