Quarterly report pursuant to Section 13 or 15(d)

Warranty provision (Details)

v3.20.2
Warranty provision (Details) - USD ($)
3 Months Ended 6 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Warranty Provision [Abstract]        
Non-cash warranty provision $ 383,414 $ 1,162,879 $ 1,247,295 $ 1,238,653