STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Operating activities:
Net (loss) Income	$ (924)	$ 46
Adjustment to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	85	96
Shared-based compensation	43	48
Changes in assets and liabilities related to operations:
Trade accounts receivable	(262)	(836)
Inventories	165	32
Prepaid expenses and other assets	(61)	104
Accounts payable	142	267
Accrued expenses	194	85
Net cash used in operating activities	(618)	(158)
Investing activities:
Proceeds from disposal of equipment		30
Acquisition of equipment and leasehold improvements	(5)	(55)
Net cash provided by/(used in) investing activities	(5)	(25)
Financing activities:
Principal payments on capital leases	(42)	(71)
Preoceeds from line of credit	200
Payments on line of credit	(300)
Proceeds from exercise of stock options		2
Net cash provided by/(used in) financing activities	(142)	(69)
(Decrease)/increase in cash and cash equivalents	(765)	(252)
Cash and cash equivalents at beginning of period	1,955	1,779
Cash and cash equivalents at end of period	1,190	1,527
Supplemental cash flow information:
Interest paid	11	10
Supplemental non-cash investing activities:
Accounts payable incurred for the purchase of equipment and leasehold improvements	30	28
Receivable from sale of property and equipment		70
Proceeds from capital lease		$ 175