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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