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Note 10 - Income Taxes (Details Textual)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
$ / shares
shares
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Income Tax Expense (Benefit), Total $ 24 $ 20   $ 101 $ 103  
Operating Loss Carryforwards, Total           $ 260,598
Operating Loss Carryforwards, Subject to Expiration           $ 227,781
Operating Loss Carry Forwards Annual Limit     $ 14,284      
Unrecognized Tax Benefits, Ending Balance     0      
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total     $ 0      
Rights [Member]            
Term of Extended Rights Plan (Year)     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      
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares     $ 4.25      
Class of Warrant or Right Current Beneficial Ownership Percentage That Will Not Trigger Preferred Share Purchase Rights     4.90%