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Note 10 - Convertible Preferred Stock and Stockholder's Equity - Warrants Outstanding to Acquire Shares of Its Common Stock (Details) | Dec. 31, 2017 $ / shares shares
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Common stock warrants, outstanding (in shares) | shares | 14,003,608
Convertible Preferred Stock Issued Prior to Merger [Member] |
Common stock warrants, outstanding (in shares) | shares | 447,721
Convertible Preferred Stock Issued Prior to Merger [Member] | Minimum [Member] |
Range of exercise price (in dollars per share) | $ / shares | $ 20
Convertible Preferred Stock Issued Prior to Merger [Member] | Maximum [Member] |
Range of exercise price (in dollars per share) | $ / shares | $ 49
Series A Convertible Preferred Stock [Member] |
Common stock warrants, outstanding (in shares) | shares | 13,555,887
Range of exercise price (in dollars per share) | $ / shares | $ 2.22

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- Definition Exercise price per share or per unit of warrants or rights outstanding. + 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)(4)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Number of warrants or rights outstanding. + 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)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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