Quarterly report pursuant to Section 13 or 15(d)

Accrued Liabilities And Warranties - Accrued Warranty Activity (Details)

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Accrued Liabilities And Warranties - Accrued Warranty Activity (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Movement in Extended Product Warranty Accrual [Roll Forward]        
Accrued warranty, beginning of period $ 4,866,213 $ 4,079,769 $ 5,400,000 $ 6,001,864
Warranty costs incurred (717,008) (513,827) (1,450,795) (2,435,922)
Net changes in liability for pre-existing warranties 337,793 0 337,793 0
Provision for warranty 405,000 0 605,000 0
Accrued warranty, end of period $ 4,891,998 $ 3,565,942 $ 4,891,998 $ 3,565,942