Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Operating activities
Net income	$ 829	$ 1,802
Adjustments to reconcile net income to net cash provided by operating activities:
Allowance for doubtful accounts	0	38
Inventories reserve	(30)	9
Deferred tax expense	354	881
Depreciation and amortization	697	930
Share-based compensation expense	33	36
Changes in operating assets and liabilities:
Accounts receivable	(950)	(1,741)
Inventories	(1,692)	(118)
Prepaid expenses and other current assets	(648)	(208)
Other assets	22	37
Accounts payable	1,199	898
Accrued compensation and related taxes	135	527
Accrued warranty expense	133	60
Note payable	0	23
Deferred revenue	0	107
Accrued other expenses and other current liabilities	(26)	19
Net cash provided by operating activities	56	3,300
Investing activities
Purchases of property, plant and equipment	(878)	(483)
Investment in securities	(2,761)	0
Net cash used in investing activities	(3,639)	(483)
Financing activities
Proceeds from issuance of common stock	76	144
Cash provided by financing activities	76	144
Net change in cash and cash equivalents	(3,507)	2,961
Cash and cash equivalents, beginning of period	11,363	7,945
Cash and cash equivalents, end of period	7,856	10,906
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