STATEMENTS OF CASH FLOWS (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Operating activities:
Net loss	$ (429)	$ (484)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	187	226
Gain on disposal of equipment		(6)
Stock compensation expense	57	77
Changes in assets and liabilities related to operations:
Trade accounts receivable	(1,078)	(202)
Other accounts receivable	1	25
Inventories	45	117
Prepaid expenses and other assets	(48)	(119)
Accounts payable	264	54
Accrued expenses	(67)	(117)
Net cash used in operating activities	(1,068)	(429)
Investing activities:
Proceeds from disposal of equipment		6
Acquisition of equipment and leasehold improvements	(30)	(42)
Payment of accounts payable incurred for the purchase of equipment and leasehold improvements	(23)	(20)
Net cash used in investing activities	(53)	(56)
Financing activities:
Principal payments on capital leases	(7)	(34)
Proceeds from exercise of stock options		3
Net cash used in financing activities	(7)	(31)
Decrease in cash and cash equivalents	(1,128)	(516)
Cash and cash equivalents at beginning of period	3,276	4,124
Cash and cash equivalents at end of period	2,148	3,608
Supplemental cash flow information:
Interest paid	1	7
Supplemental non-cash investing and financing activities:
Accounts payable incurred for the purchase of equipment and leasehold improvements	$ 10	$ 7