Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
OPERATING ACTIVITIES
Net income	$ 5,101	$ 2,776	$ 6,148
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	2,175	2,191	2,808
Amortization	839	898	912
(Gain) loss on equipment disposals/impaired assets	0	(72)	56
Gain on revaluation of ACT liability	0	0	(758)
Unrealized holding loss (gain) on marketable securities	0	13	(21)
Allowance for doubtful accounts	707	26	348
Deferred income taxes	1,252	(458)	793
Stock compensation expense	1,798	1,306	2,810
Changes in operating assets and liabilities:
Accounts receivable	(6,970)	4,249	(13,279)
Inventories	77	(202)	504
Prepaid expenses, other current assets and other noncurrent assets	2,118	(1,808)	(723)
Accounts payable	(2,968)	2,327	2,914
Accrued liabilities and other noncurrent liabilities	(1,287)	(2,579)	2,346
Net cash provided by operating activities	2,842	8,667	4,858
INVESTING ACTIVITIES
Purchases of property, equipment and patents	(1,754)	(2,534)	(2,408)
Proceeds from the sale of equipment	0	0	2
Net cash used in investing activities	(1,754)	(2,534)	(2,406)
FINANCING ACTIVITIES
Net proceeds (payments) of short-term debt	1,614	(1,187)	(1,162)
Proceeds from exercises of stock options	811	0	376
Excess tax benefit from exercises of stock options	67	0	77
Repurchases of common stock	0	(7,889)	(4,111)
Treasury shares withheld	(447)	(39)	0
Net cash provided by (used in) financing activities	2,045	(9,115)	(4,820)
Effect of exchange rate fluctuations on cash	152	(794)	73
Net increase (decrease) in cash and cash equivalents	3,285	(3,776)	(2,295)
Cash and cash equivalents at beginning of year	24,453	28,229	30,524
Cash and cash equivalents at end of year	27,738	24,453	28,229
Non-cash activities:
Decrease in contingent consideration payable	0	0	(758)
Cash paid for:
Interest	56	93	148
Income taxes paid	$ 2,901	$ 2,043	$ 5,187