Inventories as of February 28, 2022 and August 31, 2021 consisted of the following (in thousands):

	February 28,		August 31,
	2022		2021
Raw materials	$	752	$	564
Work in process		1,204		1,217
Finished goods		2,375		2,156
Total	$	4,331	$	3,937

Inventory write-downs to estimated net realizable values were $185 thousand and $416 thousand for the three and six months ended February 28, 2022, respectively, and $200 thousand and $396 thousand for the three and six months ended February 28, 2021, respectively.

Property, plant and equipment as of February 28, 2022 and August 31, 2021 consisted of the following (in thousands):

	February 28,			August 31,
	2022			2021
Buildings and improvements	$	14,850		$	14,997
Machinery and equipment		33,918			34,421
Leasehold improvements		175			176
Other equipment		2,521			2,547
Construction in progress		11			—
Total property, plant and equipment		51,475			52,141
Less: Accumulated depreciation and amortization		(46,663	)		(46,897	)
Property, plant and equipment, net	$	4,812		$	5,244

Intangible assets as of February 28, 2022 and August 31, 2021 consisted of the following (in thousands):

	February 28, 2022
	Weighted
	Average		Gross				Net
	Amortization		Carrying		Accumulated		Carrying
	Period (Years)		Amount		Amortization		Amount
Patents and trademarks		15	$	621	$	509	$	112
Acquired technology		5		363		363		—
Total			$	984	$	872	$	112

	August 31, 2021
	Weighted
	Average		Gross				Net
	Amortization		Carrying		Accumulated		Carrying
	Period (Years)		Amount		Amortization		Amount
Patents and trademarks		15	$	627	$	501	$	126
Acquired technology		5		367		367		—
Total			$	994	$	868	$	126