Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
OPERATING ACTIVITIES
Net income	$ 31,789,000	$ 1,067,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	361,000	336,000
Amortization of finite-lived intangible assets	56,000	56,000
Stock-based compensation	116,000	104,000
(Gain) loss on equity investment in unconsolidated subsidiary	(59,453,000)	200,000
Unrealized loss (gain) on marketable securities	18,665,000	(15,000)
Non-cash donation of IRNT common stock, net of realized gain	1,060,000
Deferred income tax expense	9,089,000	261,000
Changes in operating assets and liabilities:
Increase in accounts receivable, net	(909,000)	(199,000)
Decrease in inventories, net	20,000	586,000
(Increase) decrease in prepaid expenses and other assets	(148,000)	179,000
Decrease in accounts payable, accrued compensation and commissions and other	(419,000)	(745,000)
Net cash provided by operating activities	227,000	1,830,000
INVESTING ACTIVITIES
Subscription agreement funding	(2,725,000)
Capital expenditures	(759,000)	(329,000)
Proceeds from sale of marketable securities	758,000
Purchase of marketable securities	(270,000)
Net cash used in investing activities	(2,996,000)	(329,000)
FINANCING ACTIVITIES
Proceeds from at-the-market stock sales		3,254,000
Proceeds from stock option exercise	31,000	68,000
Net cash provided by financing activities	31,000	3,322,000
(Decrease) increase in cash and cash equivalents	(2,738,000)	4,823,000
Cash and cash equivalents at beginning of period	18,331,000	12,453,000
Cash and cash equivalents at end of period	15,593,000	17,276,000
Noncash Investing Activity:
Distribution of IRNT securities by Sponsor (unconsolidated subsidiary)	65,250,000
Supplemental Disclosure:
Interest paid		3,000
Income taxes paid	$ 40,000	$ 56,000