Supplemental Balance Sheet Information

12 Months Ended

Jun. 30, 2020

Supplemental Balance Sheet Information

Supplemental Balance Sheet Information

8.Supplemental Balance Sheet Information

		June 30,
		2020		2019
Inventories
Work in progress		$	817,692	$	288,828
Component parts			8,299,972		7,151,228
Finished goods			1,660,158		1,693,974
Reserve for obsolete and excess inventory			(1,849,134)		(1,800,935)
		$	8,928,688	$	7,333,095
	Estimated
	Useful Life
	(years)
Property, plant and equipment
Machinery and equipment	3‑10	$	18,831,765	$	18,073,352
Buildings	28‑35		13,055,628		13,055,628
Land and land improvements	5‑7		919,566		919,566
Total property, plant and equipment at cost			32,806,959		32,048,546
Less accumulated depreciation and amortization			(28,667,266)		(28,047,465)
		$	4,139,693	$	4,001,081

Depreciation and amortization expense was approximately $0.6 million, $0.8 million, and $0.9 million for the fiscal years ended June 30, 2020, 2019 and 2018, respectively.

Other accrued liabilities
Accrued compensation expense	$	1,257,332	$	1,149,210
Environmental remediation		514,000		—
Other		334,799		382,197
	$	2,106,131	$	1,531,407

Depreciation and amortization expense was approximately $0.6 million, $0.8 million, and $.09 million for the fiscal years ended June 30, 2020, 2019 and 2018, respectively.