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Note 11 - Income Taxes (Details Textual)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
USD ($)
$ / shares
shares
Jun. 30, 2022
USD ($)
Jun. 30, 2023
USD ($)
$ / shares
shares
Jun. 30, 2022
USD ($)
Income Tax Expense (Benefit) $ 28 $ 15 $ 51 $ 22
Operating Loss Carryforwards 288,462   288,462  
Operating Loss Carryforwards, Subject to Expiration 227,781   227,781  
Operating Loss Carry Forwards Annual Limit 14,284   14,284  
Unrecognized Tax Benefits 0   0  
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued $ 0   $ 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   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%