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Note 8 - Stockholders' Equity (Details Textual) $ / shares in Units, xbrli-pure in Thousands |  | 1 Months Ended | 3 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
May 14, 2019 $ / shares shares | Feb. 28, 2019 USD ($) $ / shares shares | May 31, 2014 USD ($) $ / shares shares | Mar. 31, 2020 USD ($) $ / shares shares | Mar. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2019 $ / shares shares | Dec. 17, 2019 shares | Dec. 31, 2018 $ / shares shares
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares |  |  |  | $ 0.50 | $ 1.45 | $ 0.50 |  | $ 2.55
Proceeds from Issuance of Private Placement | $ |  | $ 250,000 | $ 10,000,000 |  | $ 250,000 |  |  |
Proceeds from Issuance of Common Stock | $ |  |  |  |  | $ 1,974,546 |  |  |
Deferred Compensation Arrangement with Individual, Shares Authorized for Issuance (in shares) |  |  |  | 24,665,339 | 2,807,710 | 23,757,603 |  | 2,470,565
Common Stock, Shares, To be Issued (in shares) |  |  |  | 90,000 |  |  |  |
Share Price (in dollars per share) | $ / shares |  |  |  | $ 0.33 |  |  |  |
Derivative Instruments Not Designated as Hedging Instruments, Gain | $ |  |  |  |  | $ 40,000 |  |  |
Derivative, Number of Instruments Held, Total |  |  |  | 0 |  |  |  |
Common Stock, Shares Authorized (in shares) |  |  |  | 75,000,000 |  | 75,000,000 | 75,000,000 |
Chief Executive Officer, Chief Financial Officer and Employees [Member] |  |  |  |  |  |  |  |
Deferred Compensation Arrangement with Individual, Shares Authorized for Issuance (in shares) |  |  |  | 2,306,698 | 2,127,843 |  |  |
Non-Employees [Member] |  |  |  |  |  |  |  |
Common Stock, Capital Shares Reserved for Future Issuance (in shares) |  |  |  | 159,835 | 679,867 |  |  |
Preferred Stock Converted to Common Stock [Member] |  |  |  |  |  |  |  |
Conversion of Stock, Conversion Price (in dollars per share) | $ / shares | $ 1.17 |  |  |  |  |  |  |
Conversion of Stock, Shares Issued (in shares) | 5,982,906 |  |  |  |  |  |  |
Warrants, Public Offering [Member] |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  | 1,428,750 |  |  |  |  |  |
Warrants and Rights Outstanding, Term (Year) |  | 5 years |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares |  | $ 0.50 |  |  |  |  |  |
Underwrite Warrants [Member] |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  | 141,850 |  |  |  |  |  |
Warrants, Private Offering [Member] |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  | 178,571 |  |  |  |  |  |
Warrants and Rights Outstanding, Term (Year) |  | 5 years |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares |  | $ 0.50 |  |  |  |  |  |
Public Offering [Member] |  |  |  |  |  |  |  |
Proceeds from Issuance or Sale of Equity, Total | $ |  | $ 2,000,000 |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  | 5,715,000 |  |  |  |  |  |
Proceeds from Stock Options Exercised | $ |  | $ 198,000 |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares) |  | 567,400 |  |  |  |  |  |
Private Placement [Member] |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  | 714,286 | 2,000,000 |  |  |  |  |
Proceeds from Issuance of Common Stock | $ |  |  | $ 3,000,000 |  |  |  |  |
Shares Issued, Price Per Share (in dollars per share) | $ / shares |  |  | $ 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 (in shares) |  |  | 7,000 |  |  |  |  |
Shares Issued, Price Per Share (in dollars per share) | $ / shares |  |  | $ 1,000 |  |  |  |  |
Preferred Stock, Redemption Price Per Share (in dollars per share) | $ / shares |  |  | 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 (in dollars per share) | $ / shares |  |  | $ 1.50 |  |  |  |  |

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