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Note 8 - Warrants (Details Textual) - USD ($) |  | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
May 14, 2020 | Jun. 30, 2020 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019 | May 31, 2016 | Mar. 31, 2014
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  | $ 4.75 | $ 4.75 |  | $ 4.33 |  |
Class of Warrant or Right, Exercised During Period (in shares) |  |  | 3,876,405 |  |  |  |
Class of Warrant or Right, Exercised During Period, Exercise Price (in dollars per share) |  |  | $ 4.33 |  |  |  |
Proceeds from Warrant Exercises |  |  | $ 24,000 | $ 138,000 |  |  |
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] |  |  |  |  |  |  |
Stock Issued During Period, Shares, Cashless Warrant Exercises (in shares) | 2,747,970 |  |  |  |  |  |
Class of Warrant or Right, Exercised During Period (in shares) | 3,871,405 | 3,871,405 | 3,871,405 |  |  |  |
Warrants Expiring March 2021 [Member] |  |  |  |  |  |  |
Class of Warrant or Right, Exercised During Period (in shares) |  | 3,000 | 5,000 |  |  |  |
Class of Warrant or Right, Exercised During Period, Exercise Price (in dollars per share) |  | $ 4.75 | $ 4.75 |  |  |  |
Proceeds from Warrant Exercises |  | $ 14,000 | $ 24,000 |  |  |  |

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- Definition The number of warrants or rights exercised during period. + References No definition available. + Details
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- Definition The number of shares issued during the period for cashless warrant exercises. + References No definition available. + Details
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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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- Definition Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares. + 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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- Definition The cash inflow associated with the amount received from holders exercising their stock warrants. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585 + Details
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