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Note 7 - Financial Instruments (Details Textual) $ / shares in Units, shares in Millions | Jun. 30, 2020 USD ($) yr shares | Dec. 31, 2019 USD ($) | Sep. 02, 2016 USD ($) $ / shares shares
--- | --- | --- | ---
Warrants and Rights Outstanding | $ | $ 7,752,534 | $ 6,116,882 |
The 2016 Warrant [Member] |  |  |
Class of Warrant or Right Outstanding, Common Stock Value Used to Determine Number of Shares Called | $ |  |  | $ 4,000,000.0
Class of Warrant or Right Outstanding, Common Stock Price Per Share Used to Determine Number of Shares Called (in dollars per share) | $ / shares |  |  | $ 2.29
Warrants and Rights Outstanding, Term (Year) |  |  | 10 years
Class of Warrant or Right, Subscription Price of Warrants or Rights (in dollars per share) | $ / shares |  |  | $ 1.50
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares |  |  | $ 1.50
Class of Warrant or Right, Outstanding (in shares) | shares | 1.5 |  | 2.7
Warrants and Rights Outstanding | $ | $ 7,800,000 |  |
The 2016 Warrant [Member] | Measurement Input, Risk Free Interest Rate [Member] |  |  |
Warrants and Rights Outstanding, Measurement Input | 0.41 |  |
The 2016 Warrant [Member] | Measurement Input, Expected Dividend Rate [Member] |  |  |
Warrants and Rights Outstanding, Measurement Input | 0 |  |
The 2016 Warrant [Member] | Measurement Input, Expected Term [Member] |  |  |
Warrants and Rights Outstanding, Measurement Input | yr | 6.17 |  |
The 2016 Warrant [Member] | Measurement Input, Price Volatility [Member] |  |  |
Warrants and Rights Outstanding, Measurement Input | 75 |  |

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