Consolidated Balance Sheets (Current Period Unaudited) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Current assets
Cash and cash equivalents	$ 22,854	$ 43,039
Short-term marketable securities	25,255	36,339
Accounts receivable, net of allowance for doubtful accounts of $132 and $90 as of June 30, 2014 and December 31, 2013, respectively	25,187	18,320
Inventory	5,755	5,166
Prepaid expenses and other current assets	5,135	3,569
Income taxes receivable	2,051	2,907
Deferred tax assets	459	455
Total current assets	86,696	109,795
Property and equipment, net	87,313	56,101
Goodwill	28,916	0
Other intangible assets, net	4,456
Long-term marketable securities	57,325	64,023
Other long-term assets	251	256
Total assets	264,957	230,175
Current liabilities
Accounts payable	11,818	6,455
Accrued compensation	5,805	6,196
Accrued liabilities and other	3,491	808
Current portion of long-term debt obligations	194	204
Total current liabilities	21,308	13,663
Long-term deferred tax liabilities	3,731	3,682
Long-term debt obligations	77	159
Other long-term liabilities	759	1,028
Total liabilities	25,875	18,532
Shareholders' equity
Preferred stock, $0.001 par value, authorized 10,000,000 shares; issued and outstanding 0 shares as of each of June 30, 2014 and December 31, 2013
Common stock, $0.001 par value, authorized 150,000,000 shares; issued and outstanding 25,672,300 and 25,546,107 shares as of June 30, 2014 and December 31, 2013, respectively	26	26
Additional paid-in capital	172,538	166,861
Retained earnings	66,905	45,847
Accumulated other comprehensive income (loss)	(387)	(1,091)
Total shareholders' equity	239,082	211,643
Total liabilities and shareholders' equity	$ 264,957	$ 230,175