Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Operating activities
Net income	$ 2,597	$ 829
Adjustments to reconcile net income to net cash provided by operating activities:
Inventories reserve	99	(30)
Deferred tax expense	972	354
Depreciation and amortization	718	697
Share-based compensation expense	42	33
Realized tax benefit from stock option exercise	393	0
Changes in operating assets and liabilities:
Accounts receivable	(2,115)	(950)
Inventories	2,899	(1,692)
Prepaid expenses and other current assets	1,260	(648)
Other assets	(7)	22
Accounts payable	526	1,199
Accrued compensation and related taxes	803	135
Accrued warranty expense	48	133
Customer deposits	2	0
Accrued other expenses and other current liabilities	33	(26)
Deferred revenue	36	0
Net cash provided by operating activities	8,306	56
Investing activities
Purchases of property, plant and equipment	(1,348)	(878)
Investment in securities	(481)	(2,761)
Net cash used in investing activities	(1,829)	(3,639)
Financing activities
Cash dividends paid	(2,472)	0
Repurchase of common stock	(83)	0
Proceeds from issuance of common stock	30	76
Cash provided by financing activities	(2,525)	76
Net change in cash and cash equivalents	3,952	(3,507)
Cash and cash equivalents, beginning of period	4,669	11,363
Cash and cash equivalents, end of period	8,621	7,856
Supplemental disclosure
Cash paid for interest	0	0
Income tax paid	3	25
Non-cash financing activity
Cashless exercise of stock options and related conversion of net shares to stockholders' equity	$ 4	$ 15