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Warranty Liability (Details) - USD ($)
3 Months Ended 12 Months Ended
Sep. 30, 2017
Jun. 30, 2017
Guarantees [Abstract]    
Warranty reserve, beginning $ 640,000 $ 660,000
Accrual for products sold 93,000 129,000
Expenditures and costs incurred for warranty claims (43,000) (149,000)
Warranty reserve, ending $ 690,000 $ 640,000