Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
OPERATING ACTIVITIES
Net income	$ 14,638,000	$ 968,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	501,000	453,000
Amortization of finite-lived intangible assets	75,000	75,000
Stock-based compensation	413,000	790,000
(Gain) loss on equity investment in unconsolidated subsidiary	(59,453,000)	262,000
Realized loss on sale of marketable securities	17,377,000
Unrealized loss (gain) on marketable securities	22,949,000	(139,000)
Non-cash donation of IRNT common stock	1,318,000
Deferred income tax expense	3,142,000	255,000
Changes in operating assets and liabilities:
(Increase) decrease in accounts receivable, net	(545,000)	323,000
(Increase) decrease in inventories, net	(212,000)	736,000
(Increase) decrease in prepaid expenses and other assets	(226,000)	194,000
Increase (decrease) in income taxes payable	574,000	(8,000)
Increase (decrease) in accounts payable, accrued compensation and commissions expense and other	801,000	(717,000)
Net cash provided by operating activities	1,352,000	3,192,000
INVESTING ACTIVITIES
Subscription agreement funding	(2,725,000)
Capital expenditures	(1,099,000)	(407,000)
Proceeds from sale of marketable securities	18,548,000
Purchase of marketable securities	(5,318,000)	(21,000)
Net cash provided by (used in) investing activities	9,406,000	(428,000)
FINANCING ACTIVITIES
Proceeds from issuance of at-the-market stock sales		3,254,000
Share-related issuance costs		(202,000)
Proceeds from stock option exercise	178,000	85,000
Payment for taxes related to net share settlement of equity awards	(251,000)	(23,000)
Net cash (used in) provided by financing activities	(73,000)	3,114,000
Increase in cash and cash equivalents	10,685,000	5,878,000
Cash and cash equivalents at beginning of year	18,331,000	12,453,000
Cash and cash equivalents at end of year	29,016,000	18,331,000
Noncash Investing Activity:
Distribution of IRNT securities by Sponsor (unconsolidated subsidiary)	65,250,000
Supplemental Disclosure:
Interest paid		3,000
Income taxes paid	$ 72,000	$ 60,000