Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
OPERATING ACTIVITIES
Net (loss) income	$ (1,629,000)	$ 9,000
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Depreciation	313,000	233,000
Amortization of finite-lived intangible assets	38,000	38,000
Stock-based compensation	303,000	97,000
Loss on equity investment in unconsolidated subsidiary		752,000
Realized gain on sale of marketable securities	(112,000)
Unrealized loss (gain) on marketable securities	2,441,000	(202,000)
Deferred income taxes	(589,000)	56,000
Changes in operating assets and liabilities:
Increase in accounts receivable, net	(44,000)	(532,000)
Increase in inventories, net	(880,000)	(268,000)
Decrease (increase) in prepaid expenses and other assets	168,000	(33,000)
Decrease in accounts payable, accrued compensation, income taxes and commissions and other	(896,000)	(102,000)
Net cash (used in) provided by operating activities	(887,000)	48,000
INVESTING ACTIVITIES
Subscription agreement funding (Note C)		(2,725,000)
Capital expenditures	(395,000)	(400,000)
Proceeds from sale of marketable securities	1,661,000
Purchase of marketable securities	(7,000,000)
Net cash used in investing activities	(5,734,000)	(3,125,000)
FINANCING ACTIVITIES
Payment for taxes related to net share settlement of equity awards	(50,000)
Prepaid financing costs	(20,000)
Net cash used in financing activities	(70,000)
Decrease in cash and cash equivalents	(6,691,000)	(3,077,000)
Cash and cash equivalents at beginning of period	29,016,000	18,331,000
Cash and cash equivalents at end of period	22,325,000	15,254,000
Supplemental Disclosure:
Income taxes paid	$ 735,000	$ 30,000