Business Segments (Tables)

12 Months Ended

Sep. 30, 2021

Segment Reporting [Abstract]

Schedule of Business Segment Information

Information concerning our business segments is as follows (in thousands):

	Years Ended September 30,
	2021			2020			2019
Net revenue:
Semiconductor	$	72,086		$	54,516		$	66,455
Material and Substrate		13,119			10,304			13,682
Non-segment related		—			643			4,898
	$	85,205		$	65,463		$	85,035
Operating income (loss):
Semiconductor	$	8,585		$	4,168		$	8,744
Material and Substrate		278			684			3,641
Non-segment related		(5,138	)		(5,337	)		(7,469	)
	$	3,725		$	(485	)	$	4,916

	Years Ended September 30,
	2021		2020		2019
Capital expenditures:
Semiconductor	$	2,264	$	912	$	379
Material and Substrate		695		1,724		171
Non-segment related		53		39		33
	$	3,012	$	2,675	$	583
Depreciation and amortization expense:
Semiconductor	$	905	$	821	$	828
Material and Substrate		438		197		136
Non-segment related		55		60		161
	$	1,398	$	1,078	$	1,125

	September 30, 2021		September 30, 2020
Identifiable assets:
Semiconductor	$	70,631	$	51,648
Material and Substrate		19,541		12,717
Non-segment related*		26,741		37,733
	$	116,913	$	102,098

* Non-segment related assets include cash, property and other assets.