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Note 1 - Organization and Business (Details Textual) | 1 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Mar. 31, 2019 USD ($) shares | Feb. 28, 2019 USD ($) $ / shares shares | May 31, 2014 USD ($) shares | Sep. 30, 2019 USD ($) $ / shares | Sep. 30, 2018 USD ($) | Dec. 31, 2018 $ / shares
Number of Countries in which Entity Operates |  |  |  | 60 |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares |  |  |  | $ 1.49 |  | $ 2.55
Proceeds from Issuance of Private Placement | $ |  | $ 250,000 | $ 10,000,000 | $ 250,000 |  |
Warrants, Public Offering [Member] |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  | 1,428,750 |  |  |  |
Warrants and Rights Outstanding, Term |  | 5 years |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares |  | $ 0.50 |  |  |  |
Underwrite Warrants [Member] |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | 141,850 | 141,850 |  |  |  |
Warrants, Private Offering [Member] |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  | 178,571 |  |  |  |
Warrants and Rights Outstanding, Term |  | 5 years |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares |  | $ 0.50 |  |  |  |
Public Offering [Member] |  |  |  |  |  |
Proceeds from Issuance or Sale of Equity, Total | $ |  | $ 2,000,000 |  |  |  |
Stock Issued During Period, Shares, New Issues |  | 5,715,000 |  |  |  |
Proceeds from Stock Options Exercised | $ | $ 198,000 | $ 198,000 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period | 567,400 | 567,400 |  |  |  |
Private Placement [Member] |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  | 714,286 | 2,000,000 |  |  |

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