Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
OPERATING ACTIVITIES
Net (loss) income	$ (2,992,000)	$ 14,638,000
Adjustments to reconcile net (loss) income to net cash (used in) provided by operating activities:
Depreciation	496,000	501,000
Amortization of finite-lived intangible assets	62,000	75,000
Stock-based compensation	388,000	413,000
Gain on equity investment in unconsolidated subsidiary		(59,453,000)
Realized loss on sale of marketable securities	22,868,000	17,377,000
Unrealized (gain) loss on marketable securities	(18,121,000)	22,949,000
Non-cash donation of IRNT common stock		1,318,000
Deferred income tax expense	(1,516,000)	3,142,000
Changes in operating assets and liabilities:
Increase in accounts receivable, net	(613,000)	(545,000)
Increase in inventories, net	(2,330,000)	(212,000)
Increase in prepaid expenses and other assets	(135,000)	(226,000)
(Decrease) increase in income taxes payable	(476,000)	574,000
Increase (decrease) in accounts payable, accrued compensation and commissions expense and other	1,552,000	801,000
Net cash (used in) provided by operating activities	(817,000)	1,352,000
INVESTING ACTIVITIES
Subscription agreement funding		(2,725,000)
Capital expenditures	(662,000)	(1,099,000)
Proceeds from sale of marketable securities	2,058,000	18,548,000
Purchase of marketable securities	(7,229,000)	(5,318,000)
Net cash (used in) provided by investing activities	(5,833,000)	9,406,000
FINANCING ACTIVITIES
Transfer to M-tron Industries, Inc. related to Spin-Off	(1,000,000)
Exercise of stock options	191,000	178,000
Payment for taxes related to net share settlement of equity awards	(50,000)	(251,000)
Net cash (used in) financing activities	(859,000)	(73,000)
(Decrease) increase in cash and cash equivalents	(7,509,000)	10,685,000
Cash and cash equivalents at beginning of year	29,016,000	18,331,000
Cash and cash equivalents at end of year	21,507,000	29,016,000
Noncash Investing and Financing Activity:
Distribution of IRNT securities by Sponsor (unconsolidated subsidiary)		65,250,000
Distribution of M-tron Industries, Inc. related to Spin-Off	(12,790,000)
Supplemental Disclosure:
Income taxes paid	$ 741,000	$ 72,000