Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Cash flows from operating activities:
Net income	$ 2,706	$ 3,569
Adjustments to reconcile net income to net cash provided by operating activities:
Share-based compensation expense	488	413
Change in fair value of derivative instrument	(3)	172
Loss on disposition of long-term assets	4	16
Depreciation and amortization	1,834	1,924
Deferred income taxes	122	(309)
Excess tax benefit from employee stock plans	(3)	(16)
Changes in operating assets and liabilities:
Trade accounts receivable, net	704	843
Other receivables	(487)	(130)
Inventories	113	(1,340)
Prepaid income taxes	335	47
Prepaid expenses, other	140	33
Accounts payable	(1,471)	253
Accrued compensation and related expenses	(1,006)	(61)
Other accrued expenses	548	77
Accrued product warranties	(12)	(85)
Accrued income taxes	360	436
Deferred revenue	45	588
Net cash provided by operating activities	$ 4,417	6,430
Cash flows from investing activities:
Proceeds from maturities of marketable securities		205
Purchases of property, plant and equipment	$ (1,109)	(999)
Proceeds from sale of property and equipment	54	55
Cash paid for patents and other intangible assets	(185)	(372)
Other	96	(2)
Net cash used in investing activities	(1,144)	(1,113)
Cash flows from financing activities:
Proceeds from the revolving lines of credit	16,466	18,384
Payments on the revolving lines of credit	(16,857)	(18,144)
Payments on notes payable and seller financed note payable	(692)	(1,641)
Proceeds from the exercise of stock options	161	285
Excess tax benefit from employee stock plans	3	16
Dividends paid	(1,897)	(1,865)
Net cash used in financing activities	(2,816)	(2,965)
Effect of exchange rate changes on cash and cash equivalents	(376)	(344)
Net increase in cash and cash equivalents	81	2,008
Beginning of period	6,332	4,133
End of period	6,413	6,141
Supplemental disclosures of cash flow information:
Cash paid during the period for income taxes	459	1,067
Cash paid during the period for interest	102	152
Supplemental schedule of noncash investing and financing activities:
Dividends accrued	633	624
Purchases of prepaid expenses, fixed assets and intangibles in accounts payable	276	$ 174
Transfers of inventory to fixed assets	117
Purchases of fixed assets in notes payable	162
Transfer of note payable to Bank balance to the revolving line of credit	$ 585