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Note 9 - Convertible Notes (Details Textual)
1 Months Ended 3 Months Ended 12 Months Ended
Aug. 16, 2023
shares
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Mar. 31, 2024
USD ($)
Mar. 31, 2023
USD ($)
Dec. 31, 2023
USD ($)
$ / shares
shares
Dec. 31, 2022
USD ($)
Jun. 30, 2023
$ / shares
Jun. 30, 2022
Apr. 01, 2022
$ / shares
Liabilities, Fair Value Adjustment       $ (0) $ 858,000 $ 5,424,251 $ (2,389,000)      
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    
Convertible Debt [Member]                    
Liabilities, Fair Value Adjustment         $ 900,000 $ 5,400,000 $ (2,400,000)      
Debt Instrument, Convertible, Discount               30.00%    
Debt Instrument, Convertible, Conversion Price (in dollars per share) | $ / shares               $ 1.47    
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        
Convertible Debt [Member] | Minimum [Member]                    
Debt Instrument, Convertible, Discount           20.00%        
Convertible Debt [Member] | Maximum [Member]                    
Debt Instrument, Convertible, Discount           30.00%        
Convertible Debt Securities [Member]                    
Debt Instrument, Interest Rate, Stated Percentage           0.00%     5.00%  
Debt Instrument, Convertible, Conversion Price (in dollars per share) | $ / shares                   $ 3
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