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Note 1 - Description of Business and Operations (Details Textual) - USD ($)
May 20, 2022
Mar. 31, 2022
Dec. 31, 2021
Dec. 29, 2021
Common Stock, Par or Stated Value Per Share (in dollars per share)   $ 0.01 $ 0.01  
Working Capital (Deficit)   $ (10,289,000) $ (8,046,000)  
Derivative Liability, Total   6,024,000    
Temporary Equity, Liquidation Preference   23,469,000    
Term Loan and Security Agreement [Member] | Secured Term Loan Credit Facility [Member]        
Line of Credit Facility, Maximum Borrowing Capacity   $ 2,500,000   $ 2,500,000
Term Loan and Security Agreement [Member] | Secured Term Loan Credit Facility [Member] | Forecast [Member]        
Line of Credit Facility, Remaining Borrowing Capacity $ 342,000      
Series D Preferred Stock [Member]        
Preferred Stock, Par or Stated Value Per Share (in dollars per share)   $ 0.01   $ 0.01