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Note 10 - Sales of Unregistered Securities (Details Textual) - USD ($) |  | 12 Months Ended
--- | --- | ---
Dec. 24, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Common Stock, Shares, Issued, Total | 5,333,332 | 43,611,240 | 38,218,660 |
Sale of Stock, Price Per Share | $ 0.75 |  |  |
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right | 0.5 |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | 2,666,666 |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ 0.75 |  |  |
Proceeds from Issuance of Common Stock and Warrants | $ 3,800,000 | $ 3,800,000 |  |
Payments of Stock Issuance Costs | $ 200,000 | $ 200,000 |  |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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