Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Operating activities
Net income	$ 617	$ 1,147
Adjustments to reconcile net income to net cash provided by operating activities:
Allowance for doubtful accounts	0	38
Inventories reserve	(41)	0
Deferred tax expense	248	502
Depreciation and amortization	443	615
Share-based compensation expense	16	25
Changes in operating assets and liabilities:
Accounts receivable	(118)	(3,449)
Inventories	(186)	1,291
Prepaid expenses and other current assets	(615)	142
Other assets	11	22
Accounts payable	487	762
Accrued compensation and related taxes	(309)	243
Accrued warranty expense	78	28
Deferred revenue	(14)	61
Accrued other expenses and other current liabilities	(36)	(8)
Net cash provided by operating activities	581	1,419
Investing activities
Purchases of property, plant and equipment	(342)	(328)
Net cash used in investing activities	(342)	(328)
Financing activities
Proceeds from issuance of common stock	76	126
Cash provided by financing activities	76	126
Net change in cash and cash equivalents	315	1,217
Cash and cash equivalents, beginning of period	11,363	7,945
Cash and cash equivalents, end of period	11,678	9,162
Supplemental disclosure
Cash paid for interest	0	0
Income tax paid	25	0
Non-cash financing activity
Cashless exercise of stock options and related conversion of net shares to stockholders' equity	$ 15	$ 2