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Note 1 - General (Details Textual) $ in Thousands |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 05, 2014 USD ($) shares | Dec. 31, 2016 shares | Dec. 31, 2015 shares | Mar. 13, 2014 shares
Operations Commenced Date |  | Jan. 01, 2005 |  |
Subsidiary or Equity Method Investee, Number |  | 6 |  |
Entity Incorporation, Date of Incorporation |  | Nov. 24, 2004 |  |
Common Stock, Shares, Issued |  | 26,821,762 | 26,069,154 |
Common Stock, Shares Issued upon Exercise by Underwriters | 500,436 |  |  |
Proceeds from Issuance of Common Stock | $ | $ 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
IPO [Member] |  |  |  |
Common Stock, Shares, Issued | 5,300,436 |  |  |

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- Definition Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The cash inflow from the additional capital contribution to the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3255-108585 + Details
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