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Note 6 - Stockholders' Equity (Details Textual) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 1 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2017 | Jun. 30, 2017 | Jun. 30, 2016 | Mar. 03, 2015
Maximum Aggregate Offering Price |  |  |  | $ 150,000
Stock Issued During Period, Shares, New Issues | 6,061 |  |  |
Shares Issued, Price Per Share | $ 8.50 |  |  |
Proceeds from Issuance of Common Stock | $ 47,750 | $ 47,750 |  |

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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 -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585 + Details
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