Business Segments (Tables)

12 Months Ended

Sep. 30, 2020

Segment Reporting [Abstract]

Schedule of Business Segment Information

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

	Years Ended September 30,
	2020			2019			2018
Net revenue:
Semiconductor	$	54,516		$	66,455		$	80,163
SiC/LED		10,304			13,682			13,761
Non-segment related		643			4,898			6,129
	$	65,463		$	85,035		$	100,053
Operating income (loss):
Semiconductor	$	4,168		$	8,744		$	11,848
SiC/LED		684			3,641			3,672
Non-segment related		(5,337	)		(7,469	)		(9,448	)
	$	(485	)	$	4,916		$	6,072

	Years Ended September 30,
	2020		2019		2018
Capital expenditures:
Semiconductor	$	912	$	379	$	352
SiC/LED		1,724		171		603
Non-segment related		39		33		39
	$	2,675	$	583	$	994
Depreciation and amortization expense:
Semiconductor	$	821	$	828	$	715
SiC/LED		197		136		136
Non-segment related		60		161		202
	$	1,078	$	1,125	$	1,053

	September 30, 2020		September 30, 2019
Identifiable assets:
Semiconductor	$	51,648	$	56,855
SiC/LED		12,717		7,779
Non-segment related*		37,733		39,088
Held-for-sale assets**		—		22,755
	$	102,098	$	126,477

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

** See Note 2 for additional information on held-for-sale assets.