CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited Consolidated Condensed) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Operating activities:
Net loss	$ (2,022)	$ (972)
Adjustments to reconcile net loss to cash used in operating activities:
Depreciation and amortization	234	239
Loss on disposal of equipment and leasehold improvements	16
Share-based compensation	179	146
Changes in assets and liabilities related to operations:
Trade accounts receivable	(544)	(802)
Inventories	98	(706)
Prepaid expenses and other assets	(12)	(84)
Accounts payable	(632)	872
Accrued expenses	(19)	386
Deferred revenue	594
Other long-term assets and liabilities	(53)
Net cash used in operating activities	(2,161)	(921)
Investing activities:
Acquisition of equipment and leasehold improvements	(523)	(115)
Net cash used in investing activities	(523)	(115)
Financing activities:
Principal payment on finance leases	(162)	(114)
Proceeds from line of credit, bank	1,000	1,200
Payments to the line of credit, bank	(500)	(1,000)
Proceeds from line of credit, related party	8,166
Payments to line of credit, related party	(7,895)
Proceeds from issuance of common stock	1,676
Proceeds from stock option exercises	16	29
Net cash provided by financing activities	2,301	115
Decrease in cash and cash equivalents	(383)	(921)
Cash and cash equivalents at beginning of period	1,345	1,955
Cash and cash equivalents at end of period	962	1,034
Supplemental cash flow information:
Interest paid	126	32
Supplemental non-cash investing and financing activities:
Accounts payable incurred for the purchase of equipment and leasehold improvements	$ 18	6
Non-cash purchases of property and equipment		$ 248