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Note 7 - Stock Split (Details Textual) - $ / shares | Jul. 07, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Apr. 30, 2015
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Common Stock, Par or Stated Value Per Share | $ 0.01 | $ 0.01 | $ 0.01 | $ 0.01
Stock Issued During Period, Percentage of Shares, Stock Split | 66.67% |  |  |
Stock Split from [Member] |  |  |  |
Stockholders' Equity Note, Stock Split, Conversion Ratio | 5 |  |  |
Stock Split To [Member] |  |  |  |
Stockholders' Equity Note, Stock Split, Conversion Ratio | 3 |  |  |

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- Definition Increase in the number of shares during the period, as a percentage, as a result of a stock split. + References No definition available. + Details
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- Definition Face amount or stated value per share of common stock. + 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 Ratio applied to the conversion of stock split, for example but not limited to, one share converted to two or two shares converted to one. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB TOPIC 4.C) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187143-122770 + Details
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