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Warranty Liability (Details) - USD ($)
3 Months Ended 12 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Warranty reserve:    
Beginning warranty reserve $ 740,000 $ 810,000
Accrual for products sold 54,000 79,000
Expenditures and costs incurred for warranty claims (44,000) (149,000)
Ending warranty reserve $ 750,000 $ 740,000