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Note 7 - Stockholders' Equity (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2018
Dec. 31, 2021
Common Stock, Shares Authorized (in shares) 80,000,000   80,000,000
Common Stock, Par or Stated Value Per Share (in dollars per share) $ 0.001   $ 0.001
Convertible Series B Preferred Stock Subject to Mandatory Redemption [Member] | Prime Rate [Member]      
Debt Instrument, Basis Spread on Variable Rate   2.00%  
Convertible Series B Preferred Stock Subject to Mandatory Redemption [Member]      
Reclassified Stock, Shares (in shares)   583,000  
Reclassified Stock, Value   $ 1,800  
Debt Instrument, Interest Rate, Effective Percentage 9.50%    
Financial Instruments Subject to Mandatory Redemption, Settlement Terms, Share Value, Amount, Total $ 4,100   $ 3,800
Series B Preferred Stock [Member]      
Preferred Units, Authorized (in shares) 65,000,000    
Preferred Stock, Par or Stated Value Per Share (in dollars per share) $ 0.001    
Convertible Preferred Stock, Shares Issued upon Conversion (in shares) 10    
Preferred Stock, Dividend Rate, Percentage 5.00%    
Dividends, Preferred Stock, Total $ 0    
Preferred Stock, Liquidation Preference Per Share (in dollars per share) $ 3.00