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Note 9 - Financial Instruments (Details Textual) $ / shares in Units, shares in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 USD ($) shares | Dec. 31, 2020 USD ($) shares | Sep. 02, 2016 USD ($) $ / shares shares
Warrants and Rights Outstanding | $ | $ 6,521,441 | $ 6,639,211 |
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
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, Number of Securities Called by Warrants or Rights (in shares) | shares | 1,000 |  | 2,700
Class of Warrant or Right, Exercised During Period (in shares) | shares | 0 | 500 |
Warrants and Rights Outstanding, Term (Year) | 10 years |  |
Warrants and Rights Outstanding | $ |  |  | $ 5,800,000
Warrants and Rights Outstanding, Measurement Input | 6,500,000 | 6,600,000 |
The 2016 Warrant [Member] | Measurement Input, Risk Free Interest Rate [Member] |  |  |
Warrants and Rights Outstanding, Measurement Input | 0.0121 | 0.0046 |
The 2016 Warrant [Member] | Measurement Input, Expected Dividend Rate [Member] |  |  |
Warrants and Rights Outstanding, Measurement Input | 0 | 0 |
The 2016 Warrant [Member] | Measurement Input, Expected Term [Member] |  |  |
Warrants and Rights Outstanding, Measurement Input | 4.7 | 5.7 |
The 2016 Warrant [Member] | Measurement Input, Price Volatility [Member] |  |  |
Warrants and Rights Outstanding, Measurement Input | 0.55 | 0.80 |

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