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Note 14 - Stockholders' Equity (Details Textual) - USD ($) |  |  |  |  |  | 3 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 14, 2020 | Mar. 28, 2019 | Mar. 21, 2019 | Sep. 23, 2015 | Nov. 13, 2014 | Mar. 31, 2020 | Mar. 31, 2019 | Mar. 12, 2020 | Dec. 31, 2019 | Aug. 24, 2018 | Aug. 23, 2018 | Nov. 11, 2015
Preferred Stock, Shares Authorized (in shares) |  |  |  |  |  | 5,000,000 |  |  |  |  |  |
Preferred Stock, Par or Stated Value Per Share (in dollars per share) |  |  |  |  |  | $ 0.0001 |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ 0.65 |  |  |  |  |  |  |  |  |  |  | $ 3.60
Dividends, Paid-in-kind, Total | $ 41,688 |  |  |  |  | $ 112,686 |  |  |  |  |  |
Director [Member] |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Issued for Services (in shares) |  | 13,820 |  |  |  | 0 |  |  |  |  |  |
Stock Issued During Period, Value, Issued for Services |  | $ 16,506 |  |  |  |  |  |  |  |  |  |
Certain Officers, Employees, and Contractors [Member] | Share-based Payment Arrangement, Option [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) |  |  | 235,334 |  |  | 0 |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  | 3 years |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year) |  |  | 7 years |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share) |  |  | $ 1.18 |  |  |  |  |  |  |  |  |
Convertible Note Due in July 13, 2020 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Conversion Price (in dollars per share) | $ 1.15 |  |  |  |  |  |  |  |  |  |  |
September 2015 Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | 384,618 |  |  |  |  |  |  |  |  | 166,668 | 69,445 |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 1.50 | $ 3.60 |
Promissory Note [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  |  | 69,445 |  |  |  |  |  |  |  |
Amended Note [Member] | Senior Secured Convertible Note [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Conversion Price (in dollars per share) | $ 0.65 |  |  |  |  |  |  | $ 0.65 |  |  |  |
Private Investor SPA [Member] |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  |  |  | 664,584 |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  |  |  | 996,877 |  |  |  |  |  |  |
Proceeds from Issuance of Private Placement |  |  |  |  | $ 1,595,000 |  |  |  |  |  |  |
Series A-1 Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Authorized (in shares) |  |  |  |  |  | 100,000 |  |  |  |  |  |
Series B-1 Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Authorized (in shares) |  |  |  |  |  | 105,000 |  |  |  |  |  |
Preferred Stock, Shares Outstanding, Ending Balance (in shares) |  |  |  |  |  | 0 |  |  | 0 |  |  |
September 2015 Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  | $ 3.60 |  |  |  |  |  |  |  |
Term Of Warrant (Year) |  |  |  | 5 years |  |  |  |  |  |  |  |

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