Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Cash flows from operating activities:
Net income	$ 1,554	$ 1,896
Adjustments to reconcile net income to net cash provided by operating activities:
Share-based compensation expense	322	284
Change in fair value of derivative instrument	(3)	93
Gain on disposition of long-term assets	(16)	(17)
Depreciation and amortization	1,220	1,268
Deferred income taxes	(106)	(143)
Excess tax benefit from employee stock plans	(2)	(5)
Changes in operating assets and liabilities:
Trade accounts receivable, net	511	1,792
Other receivables	7	(200)
Inventories	(650)	(1,084)
Prepaid income taxes	432	(27)
Prepaid expenses, other	(180)	62
Accounts payable	(888)	(686)
Accrued compensation and related expenses	(962)	(226)
Other accrued expenses	293	(4)
Accrued product warranties	20	(104)
Accrued income taxes	294	171
Deferred revenue	281	822
Net cash provided by operating activities	2,127	3,892
Cash flows from investing activities:
Proceeds from maturities of marketable securities		205
Purchases of property, plant and equipment	(861)	(832)
Proceeds from sale of property and equipment	54	56
Cash paid for patents and other intangible assets	(124)	(144)
Other	(2)	(1)
Net cash used in investing activities	(933)	(716)
Cash flows from financing activities:
Proceeds from the revolving lines of credit	11,730	12,886
Payments on the revolving lines of credit	(11,125)	(12,299)
Payments on notes payable and seller financed note payable	(538)	(1,349)
Proceeds from the exercise of stock options	149	179
Excess tax benefit from employee stock plans	2	5
Dividends paid	(1,264)	(1,242)
Net cash used in financing activities	(1,046)	(1,820)
Effect of exchange rate changes on cash and cash equivalents	(461)	(35)
Net (decrease) increase in cash and cash equivalents	(313)	1,321
Cash and cash equivalents:
Beginning of period	6,332	4,133
End of period	6,019	5,454
Supplemental disclosures of cash flow information:
Cash paid during the period for income taxes	229	800
Cash paid during the period for interest	67	113
Supplemental schedule of noncash investing and financing activities:
Dividends accrued	633	623
Purchases of prepaid expenses, fixed assets and intangibles in accounts payable	123	$ 239
Transfers of inventory to fixed assets	$ 28