Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Operating Activities
Net income	$ 1,611	$ 1,769
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	1,091	1,534
Amortization	451	455
Gain on equipment disposals		(2)
Gain on revaluation of ACT liability		(758)
Deferred income taxes	(89)	(253)
Stock based compensation	372	1,696
Bad debt expense	(6)	70
Changes in operating assets and liabilities:
Accounts receivable	8,606	(185)
Inventories	(80)	168
Prepaid expenses, other current assets and other noncurrent assets	869	37
Accounts payable	(4,017)	(935)
Accrued liabilities and other noncurrent liabilities	(3,508)	(2,675)
Net cash provided by operating activities	5,300	921
Investing Activities
Proceeds from the sale of equipment		2
Purchases of property, equipment and patents	(1,726)	(1,242)
Net cash (used in) investing activities	(1,726)	(1,240)
Financing Activities
Payments to repurchase common stock	(7,179)
Proceeds from exercise of stock options		313
Net cash (used in) provided by financing activities	(7,179)	313
Effect of exchange rate fluctuations on cash	101	129
Net (decrease) increase in cash and cash equivalents	(3,504)	123
Cash and cash equivalents at beginning of period	28,229	30,524
Cash and cash equivalents at end of period	$ 24,725	$ 30,647