Property, Plant and Equipment

6 Months Ended

Dec. 31, 2019

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment

5. Property, Plant and Equipment

Depreciation and amortization of property, plant and equipment was $977,000 and $698,000 for the six months ended December 31, 2019 and 2018, respectively. Inventory items used for demonstration purposes, subject to a rental agreement or provided on consignment are included in property, plant and equipment and are depreciated using the straight-line method over estimated useful lives of 3 to 5 years. Depreciation of generators that are consigned to customers is expensed over a 5-year period, and depreciation is charged to selling expenses.