Annual report pursuant to Section 13 and 15(d)

Product warranty (Tables)

v3.20.1
Product warranty (Tables)
12 Months Ended
Dec. 31, 2019
Guarantees [Abstract]  
Schedule of Product Warranty Reserve
Changes in the Company’s warranty reserve were as follows:
Warranty reserve, December 31, 2017
$
133,500

Warranty provision for units sold
348,100

Costs of warranty incurred
(341,000
)
Warranty reserve, December 31, 2018
140,600

Warranty provision for units sold
535,700

Costs of warranty incurred
(471,000
)
Warranty reserve, December 31, 2019
$
205,300