Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash flows from operating activities:
Net income (loss)	$ (27)	$ 488
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Share-based compensation expense	205	186
Loss on disposition of long-term assets	5	18
Depreciation and amortization	668	689
Deferred income taxes	348	(171)
Changes in operating assets and liabilities:
Trade accounts receivable	358	(1,233)
Other receivables	5	174
Inventories	(690)	165
Prepaid income taxes	(266)	(345)
Prepaid expenses	39	(222)
Accounts payable	1,752	399
Accrued compensation and related expenses	(509)	(966)
Other accrued expenses	62	121
Accrued product warranties	(6)	16
Accrued income taxes	665	276
Deferred revenue	447	498
Net cash provided by operating activities	3,056	93
Cash flows from investing activities:
Purchases of property, plant and equipment	(175)	(137)
Proceeds from sale of property and equipment		43
Purchases of patents and other intangible assets	(15)	(8)
Other	4
Net cash used in investing activities	(186)	(102)
Cash flows from financing activities:
Payments on notes payable and seller financed note payable	(20)	(17)
Proceeds from the line of credit	1,200	850
Payments on the line of credit		(793)
Proceeds from the exercise of stock options	147	19
Proceeds from ESPP	12
Dividends paid	(644)	(637)
Net cash provided by (used in) financing activities	695	(578)
Effect of exchange rate changes on cash and cash equivalents	716	(205)
Net increase (decrease) in cash and cash equivalents	2,849	(382)
Cash and cash equivalents:
Beginning of year	8,313	6,344
End of year	11,162	5,962
Supplemental disclosures of cash flow information:
Cash paid during the year for income taxes	119	205
Cash paid during the year for interest		26
Supplemental schedule of noncash investing and financing activities:
Dividends accrued	704	637
Purchases of prepaid expenses, fixed assets and intangibles in accounts payable	(236)	(142)
Transfer of inventory to fixed assets	$ 30	$ 32