Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Operating activities:
Net loss	$ (849)	$ (1,569)
Adjustment to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	556	674
Gain on disposal of equipment		(18)
Stock compensation expense	150	192
Allowance for excess inventory quantities		47
Changes in assets and liabilities related to operations:
Trade accounts receivable	(1,274)	43
Other accounts receivable	1	26
Inventories	227	102
Prepaid expenses and other assets	(42)	14
Accounts payable	109	(169)
Accrued expenses	232	67
Net cash used in operating activities	(890)	(591)
Investing activities:
Proceeds from disposal of equipment		18
Acquisition of equipment and leasehold improvements	(352)	(178)
Payment of accounts payable incurred for the purchase of equipment and leasehold improvements	(23)	(20)
Net cash used in investing activities	(375)	(180)
Financing activities:
Principal payments on capital leases	(23)	(49)
Proceeds from sale of short term investment	30
Proceeds from exercise of stock options		3
Net cash provided by (used in) financing activities	7	(46)
Decrease in cash and cash equivalents	(1,258)	(817)
Cash and cash equivalents at beginning of period	3,276	4,124
Cash and cash equivalents at end of period	2,018	3,307
Supplemental cash flow information:
Interest paid	4	11
Supplemental non-cash investing activities:
Accounts payable incurred for the purchase of equipment and leasehold improvements		$ 92