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Note 8 - Stockholders' Equity (Details Textual) - USD ($) |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | ---
May 14, 2019 | Mar. 31, 2019 | Feb. 28, 2019 | May 31, 2014 | Jun. 30, 2019 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Class of Warrant or Right, Exercise Price of Warrants or Rights |  |  |  |  | $ 1.48 | $ 1.48 |  | $ 2.55
Proceeds from Issuance of Private Placement |  |  | $ 250,000 | $ 10,000,000 |  | $ 250,000 |  |
Proceeds from Issuance of Common Stock |  |  |  |  |  | $ 1,974,547 |  |
Equity Securities Issued |  |  |  |  | 4,850,000 | 4,850,000 |  |
Common Stock, Shares, To be Issued |  |  |  |  | 2,900,000 | 2,900,000 |  |
Share Price |  |  |  |  | $ 0.36 | $ 0.36 |  |
Gain (Loss) on Liability Classified Shares to Be Issued |  |  |  |  |  | $ 47,000 |  |
Warrant [Member] |  |  |  |  |  |  |  |
Derivative, Gain (Loss) on Derivative, Net, Total |  |  |  |  | $ (34,000) | $ 6,000 |  |
Chief Executive Officer, Chief Financial Officer and Employees [Member] |  |  |  |  |  |  |  |
Deferred Compensation Arrangement with Individual, Shares Authorized for Issuance |  |  |  |  | 2,185,910 | 2,185,910 |  | 1,908,813
Non-Employees [Member] |  |  |  |  |  |  |  |
Common Stock, Capital Shares Reserved for Future Issuance |  |  |  |  | 717,456 | 717,456 |  | 561,752
Preferred Stock Converted to Common Stock [Member] |  |  |  |  |  |  |  |
Conversion of Stock, Conversion Price | $ 1.17 |  |  |  |  |  |  |
Conversion of Stock, Shares Issued | 5,982,906 |  |  |  |  |  |  |
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 |  |  | $ 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 |  |  | $ 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 |  |  |  |
Proceeds from Issuance of Common Stock |  |  |  | $ 3,000,000 |  |  |  |
Shares Issued, Price Per Share |  |  |  | $ 1.50 |  |  |  |
Proceeds from Issuance of Convertible Preferred Stock |  |  |  | $ 7,000,000 |  |  |  |
Private Placement [Member] | Series A Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  |  | 7,000 |  |  |  |
Shares Issued, Price Per Share |  |  |  | $ 1,000 |  |  |  |
Preferred Stock, Redemption Price Per Share |  |  |  | 2.545 |  |  |  |
Private Placement [Member] | Series A Convertible Preferred Stock [Member] | Conversion Price if Common Stock Not Trade at 3.15 [Member] |  |  |  |  |  |  |  |
Preferred Stock, Redemption Price Per Share |  |  |  | 1.50 |  |  |  |
Convertible Preferred Stock, Shares Price Trigger |  |  |  | $ 3.15 |  |  |  |

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