STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Operating activities:
Net loss	$ (789)	$ (1,283)
Adjustment to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	344	610
Impairment (gain on disposal) of fixed asset	(12)	54
Shared-based compensation	183	207
Changes in assets and liabilities related to operations:
Trade accounts receivable	(681)	73
Inventories	(367)	(110)
Prepaid expenses and other assets	27	(194)
Accounts payable	369	161
Accrued expenses	(34)	241
Net cash used in operating activities	(960)	(241)
Investing activities:
Acquisition of equipment and leasehold improvements	(209)	(128)
Proceeds from disposal of equipment	137
Payment of accounts payable incurred for the purchase of equipment and leasehold improvements		(37)
Net cash provided used in investing activities	(72)	(165)
Financing activities:
Principal payments on capital leases	(139)	(96)
Proceeds from line of credit	300
Proceeds from sale of common stock	1,000	988
Proceeds from exercise of stock options	47	18
Net cash provided by financing activities	1,208	910
Increase in cash and cash equivalents	176	504
Cash and cash equivalents at beginning of period	1,779	1,275
Cash and cash equivalents at end of period	1,955	1,779
Supplemental cash flow information:
Interest paid	34	15
Supplemental non-cash investing and financing activities:
Capital lease obligations incurred in the purchase of equipment	$ 481	$ 75