CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ 4,304	$ (1,542)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization	1,014	959
Provision for doubtful accounts	40	2
Deferred taxes	11	35
Foreign currency transaction gains	(21)	(62)
Stock compensation costs	552	276
Changes in operating assets and liabilities:
Accounts receivable	(3,399)	117
Inventories	663	(1,567)
Other assets	(575)	(323)
Accounts payable	523	(83)
Advance customer payments	706	28
Accrued expenses	1,427	(402)
Net cash provided by (used in) operating activities	5,245	(2,562)
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from maturities of available-for-sale marketable securities	1,631	2,698
Proceeds from sales of available-for-sale marketable securities	1,402	716
Purchases of available-for-sale marketable securities	(2,069)	(2,194)
Additions to equipment and leasehold improvements	(656)	(266)
Additions to patents	(43)	(32)
Net cash provided by investing activities	265	922
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from exercise of stock options	258	294
Net cash provided by financing activities	258	294
Effects of exchange rate changes on cash and cash equivalents	40	(6)
Net increase (decrease) in cash and cash equivalents	5,808	(1,352)
Cash and cash equivalents – beginning of period	4,274	5,171
Cash and cash equivalents – end of period	$ 10,082	$ 3,819