Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Operating activities
Net (loss) income	$ (401)	$ (688)
Adjustments to reconcile net loss to net cash used in operating activities:
Allowance for doubtful accounts	(1)	0
Inventories reserve	52	35
Deferred tax asset	(279)	0
Depreciation and amortization	317	351
Share-based compensation expense	15	50
Changes in operating assets and liabilities:
Accounts receivable	2,037	1,242
Inventories	(437)	(1,471)
Prepaid expenses and other current assets	(27)	61
Other assets	9	11
Accounts payable	(360)	508
Accrued compensation and related taxes	106	141
Accrued warranty expense	8	12
Deferred revenue	1	128
Accrued other expenses and other current liabilities	(263)	(57)
Net cash provided by operating activities	777	323
Investing activities
Purchases of property, plant and equipment	(19)	(118)
Net cash used in investing activities	(19)	(118)
Financing activities
Proceeds from issuance of common stock	20	0
Increase in revolving line of credit	0	1,500
Decrease in revolving line of credit	0	(1,200)
Net cash provided by financing activities	20	300
Net change in cash and cash equivalents	778	505
Cash and cash equivalents, beginning of period	2,693	5,050
Cash and cash equivalents, end of period	3,471	5,555
Supplemental disclosure
Cash paid for interest	0	35
Cash paid for income taxes	61	0
Non-cash financing activity
Cashless exercise of stock options	$ 4	$ 0