Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
OPERATING ACTIVITIES
Net income	$ 1,067	$ 6,051
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	336	309
Amortization of finite-lived intangible assets	56	56
Stock-based compensation	104	17
Loss from equity investment in unconsolidated subsidiary	200
Unrealized gain on marketable securities	(15)	(179)
Deferred income tax expense	261	(3,306)
Changes in operating assets and liabilities:
Increase in accounts receivable, net	(199)	(1,508)
Decrease (increase) in inventories, net	586	(2,010)
Decrease (increase) in prepaid expenses and other assets	179	(110)
(Decrease) increase in accounts payable, accrued compensation and commissions and other accrued liabilities	(745)	1,769
Net cash provided by operating activities	1,830	1,089
INVESTING ACTIVITIES
Purchase of marketable securities, net		(5,000)
Capital expenditures	(329)	(826)
Net cash used in investing activities	(329)	(5,826)
FINANCING ACTIVITIES
Proceeds from at-the-market stock sales	3,254
Proceeds from stock option exercise	68	390
Net cash provided by financing activities	3,322	390
Increase (decrease) in cash and cash equivalents	4,823	(4,347)
Cash and cash equivalents at beginning of period	12,453	15,508
Cash and cash equivalents at end of period	17,276	11,161
Supplemental Disclosure:
Cash paid for interest	3	6
Cash paid for income taxes	$ 56	$ 72