CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited Consolidated Condensed) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Operating activities:
Net income	$ 62	$ 1,310
Adjustments to reconcile net income to cash used in operating activities:
Depreciation and amortization	136	101
Share-based compensation	148	42
Gain on PPP loan forgiveness		(952)
Amortization of debt discount		67
Changes in assets and liabilities related to operations:
Trade accounts receivable	(1,337)	(896)
Inventories	(2,464)	(661)
Prepaid expenses and other assets	(94)	(47)
Accounts payable	1,347	253
Accrued expenses	15	571
Deferred revenue	65	84
Other long-term assets and liabilities	347	(9)
Net cash used in operating activities	(1,775)	(137)
Investing activities:
Acquisition of equipment and leasehold improvements	(378)	(166)
Net cash used in investing activities	(378)	(166)
Financing activities:
Principal payments on finance leases	(38)	(46)
Proceeds from line of credit, bank		500
Payments to the line of credit, bank		(500)
Proceeds from line of credit, related party	8,125	6,500
Payments to line of credit, related party	(5,767)	(5,289)
Payments from exercise of stock options	73
Net cash provided by financing activities	2,393	1,165
Increase in cash and cash equivalents	240	862
Cash and cash equivalents at beginning of period	657	957
Cash and cash equivalents at end of period	897	1,819
Supplemental cash flow information:
Interest paid	27	51
Supplemental non-cash investing and financing activities:
Accounts payable incurred for the purchase of equipment and leasehold improvements	$ 40	$ 69