CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Operating activities
Net (loss) income	$ (8,270)	$ 1,168
Adjustments to reconcile net (loss) income to net cash used in operating activities:
Inventories allowances	48	428
Deferred tax expense	0	184
Depreciation and amortization	696	681
Share-based compensation expense-stock options	136	65
Share-based compensation expense-restricted stock units	241	128
Loss (gain) on investment in securities	1,098	(2,467)
Changes in operating assets and liabilities:
Trade accounts receivable	1,710	(744)
Inventories	(5,568)	(3,189)
Prepaid expenses and other current assets	352	12
Other assets	(39)	11
ROU asset and lease liability	(17)	(8)
Accounts payable	3,921	1,197
Accrued compensation and related taxes	682	(154)
Accrued warranty expense	18	(147)
Deferred revenue	206	(47)
Accrued other expenses and other current liabilities	(521)	57
Net cash used in operating activities	(5,307)	(2,825)
Investing activities
Purchases of property, plant, and equipment	(714)	(1,541)
Net cash used in investing activities	(714)	(1,541)
Financing activities
Proceeds from common stock issuance, net of costs	0	11,559
Cash dividends paid	(1,011)	(501)
Proceeds from the credit facility and notes payable	2,488	3,543
Repayment of the credit facility and notes payable	(132)	(1,400)
Net cash provided by (used in) financing activities	1,345	13,201
Net change in cash and cash equivalents	(4,676)	8,835
Cash and cash equivalents, beginning of period	10,580	6,826
Cash and cash equivalents, end of period	5,904	15,661
Supplemental disclosure
Cash paid for interest	43	14
Non-cash financing activity
Common stock issued under restricted stock units	$ 178	$ 84