Note 1 - General (Details) (USD $) In Thousands, except Share data, unless otherwise specified	0 Months Ended	3 Months Ended
	Mar. 05, 2014	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Mar. 13, 2014	Mar. 05, 2014
Note 1 - General (Details) [Line Items]
Entity Incorporation, Date of Incorporation		Nov. 03, 2004
Operations Commenced Date		Jan. 01, 2005
Number of subsidiaries		5
Common Stock, Shares, Issued		24,844,646	24,685,604
Common Stock Shares Issued Upon Exercise by Underwriters	500,436					500,436
Proceeds from Issuance of Common Stock (in Dollars)	$ 106,071
Conversion of Convertible Preferred Stock to Common Stock at Initial Public Offering, Shares	15,082,141
Conversion of Preferred Stock Warrants to Common Stock Warrants, Shares	122,572
Class of Warrant or Right, Number of Securities Called by Warrants or Rights					107,217
Derivative Asset, Number of Instruments Held				0
IPO [Member]
Note 1 - General (Details) [Line Items]
Common Stock, Shares, Issued	5,300,436					5,300,436
Foreign Exchange Contract [Member]
Note 1 - General (Details) [Line Items]
Derivative Instrument, Maturity Period	12 months