Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Operating activities:
Net loss	$ (573)	$ (854)
Adjustment to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	505	550
Stock compensation expense	129	139
Changes in assets and liabilities related to operations:
Trade accounts receivable	(798)	(1,090)
Other accounts receivable		(4)
Inventories	3	307
Prepaid expenses and other assets	(101)	121
Accounts payable	167	301
Accrued expenses	314	(12)
Net cash used in operating activities	(354)	(542)
Investing activities:
Acquisition of equipment and leasehold improvements	(102)	(228)
Payment of accounts payable incurred for the purchase of equipment and leasehold improvements	(37)	(8)
Net cash used in investing activities	(139)	(236)
Financing activities:
Principal payments on capital leases	(70)	(61)
Proceeds from common stock issuance	988
Proceeds from line of credit		450
Principal payments on line of credit		(250)
Proceeds from exercise of stock options	18	26
Net cash provided by financing activities	936	165
Increase/(Decrease) in cash and cash equivalents	443	(613)
Cash and cash equivalents at beginning of period	1,275	1,862
Cash and cash equivalents at end of period	1,718	1,249
Supplemental cash flow information:
Interest paid	11	9
Supplemental non-cash investing activities:
Accounts payable incurred for the purchase of equipment and leasehold improvements	$ 5	28
Capital lease obligations incurred in the purchase of equipment		$ 65