Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Operating activities:
Net loss	$ (610)	$ (606)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	182	184
Stock compensation expense	47	47
Changes in assets and liabilities related to operations:
Trade accounts receivable	(423)	(871)
Inventories	(96)	124
Prepaid expenses and other assets	(50)	15
Accounts payable	210	525
Accrued expenses	42	(30)
Net cash used in operating activities	(698)	(612)
Investing activities:
Acquisition of equipment and leasehold improvements	(27)	(38)
Payment of accounts payable incurred for the purchase of equipment and leasehold improvements	(37)	(8)
Net cash used in investing activities	(64)	(46)
Financing activities:
Principal payments on capital leases	(23)	(23)
Proceeds from exercise of stock options		26
Proceeds from common stock issuance	988
Net cash provided by financing activities	965	3
Increase/(Decrease) in cash and cash equivalents	203	(655)
Cash and cash equivalents at beginning of period	1,275	1,862
Cash and cash equivalents at end of period	1,478	1,207
Supplemental cash flow information:
Interest paid	4	3
Supplemental non-cash investing and financing activities:
Accounts payable incurred for the purchase of equipment and leasehold improvements	$ 34	$ 61