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Note 9 - Convertible Notes (Details Textual)
1 Months Ended 3 Months Ended 9 Months Ended
Aug. 16, 2023
shares
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Sep. 30, 2023
USD ($)
$ / shares
Sep. 30, 2022
USD ($)
Sep. 30, 2023
USD ($)
$ / shares
shares
Sep. 30, 2022
USD ($)
Jun. 30, 2023
$ / shares
Liabilities, Fair Value Adjustment           $ (5,424,251) $ 1,769,000  
Conversion of Debt into Common Stock [Member]                
Debt Conversion, Converted Instrument, Shares Issued | shares 795,905         795,905    
Debt Conversion, Converted Instrument, Warrants or Options Issued | shares 101,367         101,367    
Prefunded Warrant [Member]                
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares       $ 0.001   $ 0.001   $ 0.001
Convertible Debt [Member]                
Liabilities, Fair Value Adjustment       $ 4,800,000 $ 0 $ 5,400,000 $ (1,800,000)  
Debt Instrument, Convertible, Conversion Price | $ / shares               $ 1.47
Debt Instrument, Convertible, Discount               30.00%
Debt Instrument, Convertible, Maximum Beneficial Ownership               9.99%
Payments of Debt Issuance Costs           50,000    
Debt Instrument, Convertible, Number of Equity Instruments 897,272              
Adjustments to Additional Paid in Capital, Convertible Debt with Conversion Feature           $ 7,000,000.0    
The 2020 Notes [Member]                
Proceeds from Issuance of Long-Term Debt     $ 5,100,000          
The 2021 Notes [Member]                
Proceeds from Issuance of Long-Term Debt   $ 6,000,000.0