Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
OPERATING ACTIVITIES
Net income	$ 438	$ 1,521
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	224	202
Amortization of finite-lived intangible assets	37	38
Stock-based compensation	47	12
Loss from equity investment in unconsolidated subsidiary	139
Loss (gain) on marketable securities	107	(145)
Deferred income tax expense	112	24
Changes in operating assets and liabilities:
Increase in accounts receivable, net	(25)	(1,647)
Increase in inventories, net	(2)	(1,295)
Decrease (increase) in prepaid expenses and other assets	179	(29)
(Decrease) increase in accounts payable, accrued compensation and commissions and other accrued liabilities	(385)	1,055
Net cash provided by (used in) operating activities	871	(264)
INVESTING ACTIVITIES
Purchase of marketable securities, net		(5,000)
Capital expenditures	(105)	(692)
Net cash used in investing activities	(105)	(5,692)
FINANCING ACTIVITIES
Net proceeds from revolving credit agreement	103
Proceeds from at-the-market stock sales	3,254
Proceeds from stock option exercise	63	268
Net cash provided by financing activities	3,420	268
Increase (decrease) in cash and cash equivalents	4,186	(5,688)
Cash and cash equivalents at beginning of period	12,453	15,508
Cash and cash equivalents at end of period	16,639	9,820
Supplemental Disclosure:
Cash paid for interest	1	6
Cash paid for income taxes	$ 30	$ 58