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Note 10 - Subsequent Events (Details Textual) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Aug. 01, 2022
Jun. 30, 2022
Mar. 31, 2021
Jun. 30, 2022
Jun. 30, 2021
Jul. 25, 2022
Stock Issued During Period, Value, New Issues   $ 1,450,000 $ 6,832,000      
Proceeds from Issuance of Common Stock, Net       $ 2,044,000 $ 6,832,000  
Subsequent Event [Member]            
Stock Issued During Period, Value, New Issues $ 3,541,922          
Proceeds from Issuance of Common Stock 1,038,000          
Proceeds from Issuance of Common Stock, Net 996,000          
Payments of Stock Issuance Costs $ 42,000          
Debt Instrument, Convertible, Conversion Price (in dollars per share)           $ 0.21