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Note 10 - Income Taxes (Details Textual)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Feb. 03, 2022
Feb. 07, 2019
Mar. 31, 2022
USD ($)
Mar. 31, 2021
USD ($)
Mar. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
$ / shares
shares
Income Tax Expense (Benefit), Total     $ 7 $ 32 $ (1)  
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
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares           $ 7.26
Class of Warrant or Right Current Beneficial Ownership Percentage That Will Not Trigger Preferred Share Purchase Rights           4.90%