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Warranty Liability (Details) - USD ($)
9 Months Ended 12 Months Ended
Mar. 31, 2021
Jun. 30, 2020
Warranty reserve:    
Beginning warranty reserve $ 740,000 $ 810,000
Accrual for products sold 127,500 79,000
Expenditures and costs incurred for warranty claims (127,500) (149,000)
Ending warranty reserve $ 740,000 $ 740,000