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Note 10 - Income Taxes (Details Textual)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Feb. 03, 2022
Feb. 07, 2019
Sep. 30, 2022
USD ($)
$ / shares
shares
Sep. 30, 2021
USD ($)
Sep. 30, 2022
USD ($)
$ / shares
shares
Sep. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
Income Tax Expense (Benefit), Total     $ 14 $ 24 $ 36 $ 101  
Operating Loss Carryforwards, Total             $ 277,310
Operating Loss Carryforwards, Subject to Expiration             $ 227,781
Operating Loss Carry Forwards Annual Limit     14,284   14,284    
Unrecognized Tax Benefits, Ending Balance     0   0    
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total     $ 0   $ 0    
Rights [Member]              
Term of Extended Rights Plan (Year) 3 years 3 years          
Threshold Percentage of Beneficial Ownership for Significant Dilution in Ownership Interest         4.90%    
Class of Warrant or Right Number of Rights Per Common Stock Share         1    
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares) | shares     0.001   0.001    
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares     $ 7.26   $ 7.26    
Class of Warrant or Right Current Beneficial Ownership Percentage That Will Not Trigger Preferred Share Purchase Rights         4.90%