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Warranty Liability (Details) - USD ($)
3 Months Ended 12 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Warranty reserve:    
Beginning warranty reserve $ 810,000 $ 760,000
Accrual for products sold   201,000
Expenditures and costs incurred for warranty claims (36,000) (151,000)
Ending warranty reserve $ 800,000 $ 810,000