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Note 11 - Subsequent Events (Details Textual) - USD ($) $ / shares in Units, $ in Thousands |  | 12 Months Ended
--- | --- | ---
Mar. 14, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Proceeds from Issuance of Common Stock |  | $ 15,250 | $ 16,000 |
Subsequent Event [Member] | 2017 Omnibus Incentive Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | 2,137,037 |  |  |
IPO [Member] | Subsequent Event [Member] |  |  |  |
Stock Issued During Period, Shares, New Issues | 174,286 |  |  |
Shares Issued, Price Per Share | $ 20 |  |  |
Proceeds from Issuance of Common Stock | $ 3,486 |  |  |
Private Placement [Member] | Subsequent Event [Member] |  |  |  |
Stock Issued During Period, Shares, New Issues | 2,541,048 |  |  |
Shares Issued, Price Per Share | $ 20 |  |  |
Proceeds from Issuance of Common Stock | $ 50,821 |  |  |
Private Placement [Member] | Subsequent Event [Member] | Nereus Trust [Member] |  |  |  |
Stock Issued in Lieu of Royalty Payments | 2,112,963 |  |  |

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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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