Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
OPERATING ACTIVITIES
Net income	$ 2,776	$ 6,148	$ 1,753
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation (in Dollars)	2,191	2,808	3,195
Amortization	898	912	886
(Gain) loss on equipment disposals/impaired assets	(72)	56	20
Gain on revaluation of ACT liability		(758)	(768)
Unrealized holding loss (gain) on marketable securities	13	(21)
Allowance for doubtful accounts	26	348	12
Deferred income taxes	(458)	793	(588)
Stock compensation expense	1,306	2,810	4,274
Accounts receivable	4,249	(13,279)	(3,377)
Inventories	(202)	504	(354)
Prepaid expenses, other current assets and other noncurrent assets	(1,808)	(723)	(27)
Accounts payable	2,327	2,914	1,765
Accrued liabilities and other noncurrent liabilities	(2,579)	2,346	5,379
Other			20
Net cash provided by operating activities	8,667	4,858	12,190
INVESTING ACTIVITIES
Increase in restricted cash			200
Purchases of property, equipment and patents	(2,534)	(2,408)	(2,206)
Proceeds from the sale of equipment		2
Net cash used in investing activities	(2,534)	(2,406)	(2,006)
FINANCING ACTIVITIES
Payments of short-term debt	(1,187)	(1,162)	(737)
Proceeds from exercises of stock options	0	376	10
Excess tax benefit from exercises of stock options		77
Repurchases of common stock	(7,889)	(4,111)
Purchase of treasury stock	(39)
Other			(5)
Net cash used in financing activities	(9,115)	(4,820)	(732)
Effect of exchange rate fluctuations on cash	(794)	73	107
Net (decrease) increase in cash and cash equivalents	(3,776)	(2,295)	9,559
Cash and cash equivalents at beginning of year	28,229	30,524	20,965
Cash and cash equivalents at end of year	24,453	28,229	30,524
Non-cash activities:
Decrease in contingent consideration payable		(758)	(768)
Cash paid for:
Interest	93	148	143
Income taxes paid	$ 2,043	$ 5,187	$ 297