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Note 8 - Warrants (Details Textual) - $ / shares |  | 3 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
May 14, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | May 31, 2016 | Mar. 31, 2014
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  | $ 4.33 | $ 4.33 |  |
Class of Warrant or Right, Exercised During Period (in shares) |  | 2,000 |  |  |
Class of Warrant or Right, Outstanding (in shares) |  | 3,957,005 | 3,959,005 |  |
Warrants to Purchase Common Stock [Member] |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  |  |  | 6,910,283
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  |  | $ 4.75
Warrants in Connection with WAVI Credit Facility [Member] |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  |  | 550,000 |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  | $ 1.75 |
WAVI Holding AG and Taurus4757 GmbH Warrants [Member] | Subsequent Event [Member] |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ 4.75 |  |  |  |
Stock Issued During Period, Shares, Warrant Exercises (in shares) | 2,747,970 |  |  |  |
Class of Warrant or Right, Exercised During Period (in shares) | 3,871,405 |  |  |  |
Class of Warrant or Right, Outstanding (in shares) | 85,600 |  |  |  |

X
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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644 + Details
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