CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited Consolidated Condensed) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Operating activities:
Net loss	$ (1,160)	$ (836)
Adjustments to reconcile net loss to cash used in operating activities:
Depreciation and amortization	155	166
Loss on disposal of equipment and leasehold improvements	16
Share-based compensation	115	88
Changes in assets and liabilities related to operations:
Trade accounts receivable	(823)	(313)
Inventories	149	(264)
Prepaid expenses and other assets	(78)	(109)
Accounts payable	(224)	563
Accrued expenses	(54)	102
Other long-term assets and liabilities	(36)
Net cash used in operating activities	(1,940)	(603)
Investing activities:
Acquisition of equipment and leasehold improvements	(389)	(132)
Net cash used in investing activities	(389)	(132)
Financing activities:
Principal payment on finance leases	(107)	(79)
Proceeds from line of credit, bank	500	700
Payments to the line of credit, bank	(500)	(500)
Proceeds from line of credit, related party	5,846
Payments to line of credit, related party	(5,432)
Proceeds from issuance of common stock	1,676
Proceeds from stock option exercises	16
Net cash provided by financing activities	1,999	121
Decrease in cash and cash equivalents	(330)	(614)
Cash and cash equivalents at beginning of period	1,345	1,955
Cash and cash equivalents at end of period	1,015	1,341
Supplemental cash flow information:
Interest paid	86	20
Supplemental non-cash investing and financing activities:
Accounts payable incurred for the purchase of equipment and leasehold improvements	$ 39	8
Non-cash purchases of property and equipment		$ 45