Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Operating activities:
Net loss	$ (148)	$ (699)
Adjustment to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	361	366
Stock compensation expense	88	94
Changes in assets and liabilities related to operations:
Trade accounts receivable	(1,197)	(1,202)
Inventories	65	415
Prepaid expenses and other assets	(195)	80
Accounts payable	156	201
Accrued expenses	178	(4)
Net cash used in operating activities	(692)	(749)
Investing activities:
Acquisition of equipment and leasehold improvements	(63)	(184)
Payment of accounts payable incurred for the purchase of equipment and leasehold improvements	(37)	(8)
Net cash used in investing activities	(100)	(192)
Financing activities:
Principal payments on capital leases	(47)	(41)
Proceeds from line of credit		250
Proceeds from common stock issuance	988
Proceeds from exercise of stock options		26
Net cash provided by financing activities	941	235
Increase/(Decrease) in cash and cash equivalents	149	(706)
Cash and cash equivalents at beginning of period	1,275	1,862
Cash and cash equivalents at end of period	1,424	1,156
Supplemental cash flow information:
Interest paid	8	6
Supplemental non-cash investing activities:
Accounts payable incurred for the purchase of equipment and leasehold improvements	$ 11	65
Capital lease obligations incurred in the purchase of equipment		$ 65