STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Operating activities:
Net loss	$ (574)	$ (573)
Adjustment to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	267	505
Stock compensation expense	140	129
Changes in assets and liabilities related to operations:
Trade accounts receivable	(1,147)	(798)
Inventories	(104)	3
Prepaid expenses and other assets	53	(101)
Accounts payable	333	167
Accrued expenses	166	314
Net cash used in operating activities	(866)	(354)
Investing activities:
Proceeds from disposal of equipment	136
Acquisition of equipment and leasehold improvements	(121)	(102)
Payment of accounts payable incurred for the purchase of equipment and leasehold improvements		(37)
Net cash provided by/(used in) investing activities	15	(139)
Financing activities:
Principal payments on capital leases	(122)	(70)
Proceeds from line of credit	250
Proceeds from common stock issuance		988
Proceeds from exercise of stock options	14	18
Net cash provided by financing activities	142	936
(Decrease)/increase in cash and cash equivalents	(709)	443
Cash and cash equivalents at beginning of period	1,779	1,275
Cash and cash equivalents at end of period	1,070	1,718
Supplemental cash flow information:
Interest paid	24	11
Supplemental non-cash investing and financing activities:
Accounts payable incurred for the purchase of equipment and leasehold improvements	9	$ 5
Capital lease obligations incurred in the purchase of equipment	$ 307