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Note 7 - Subsequent Events (Details Textual) - USD ($)
Aug. 15, 2022
Aug. 11, 2022
Jun. 30, 2022
Dec. 31, 2021
Common Stock, Par or Stated Value Per Share (in dollars per share)     $ 0.00001 $ 0.00001
Subsequent Event [Member] | Promissory Note [Member]        
Debt Instrument, Face Amount $ 500,000      
Subsequent Event [Member] | Equity Line of Credit [Member]        
Line of Credit Facility, Maximum Borrowing Capacity $ 15,000,000      
Subsequent Event [Member] | Purchase Agreement [Member]        
Purchase Agreement, Shares to be Sold (in shares)   5,789,716    
Common Stock, Par or Stated Value Per Share (in dollars per share)   $ 0.00001    
Purchase Agreement, Shares to be Sold, Price Per Share (in dollars per share)   $ 0.8636