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Note 6 - Long-term Debt (Details Textual)
3 Months Ended 6 Months Ended
Jun. 22, 2022
USD ($)
$ / shares
shares
Mar. 01, 2022
USD ($)
Apr. 08, 2021
USD ($)
$ / shares
shares
Jun. 30, 2023
USD ($)
$ / shares
Jun. 30, 2022
USD ($)
Jun. 30, 2023
USD ($)
$ / shares
Jun. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
$ / shares
Stock Issued During Period, Shares, Issued for Commitment Fee (in shares) | shares     10,000          
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares     $ 0.001 $ 0.001   $ 0.001   $ 0.001
Senior Promissory Notes Placement Agent Warrants [Member]                
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares 28,750              
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares $ 5.20              
Warrants and Rights Outstanding, Term (Year) 5 years              
Senior Promissory Notes [Member]                
Debt Instrument, Face Amount $ 6,000,000.0     $ 6,000,000   $ 6,000,000   $ 6,000,000
Interest Expense, Debt       0 $ 0 0 $ 0  
Amortization of Debt Issuance Costs       86,790 7,235 171,318 7,235  
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares 531,250              
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares $ 5.20              
Warrants and Rights Outstanding, Term (Year) 5 years              
Debt Instrument, Term (Month) 24 months              
Debt Instrument, Interest Rate, Stated Percentage 10.00%              
Debt Instrument, Stated Rate, Monthly Increase if Unpaid 1.00%              
Debt Instrument, Unamortized Discount, Total $ 695,749     348,368   348,368   $ 519,686
Senior Promissory Notes [Member] | Measurement Input, Expected Term [Member]                
Debt Instrument, Measurement Input 2.5              
Senior Promissory Notes [Member] | Measurement Input, Share Price [Member]                
Debt Instrument, Measurement Input 3.44              
Senior Promissory Notes [Member] | Measurement Input, Exercise Price [Member]                
Debt Instrument, Measurement Input 5.20              
Senior Promissory Notes [Member] | Measurement Input, Price Volatility [Member]                
Debt Instrument, Measurement Input 0.808              
Senior Promissory Notes [Member] | Measurement Input, Risk Free Interest Rate [Member]                
Debt Instrument, Measurement Input 0.0313              
Senior Promissory Notes [Member] | Measurement Input, Forfeiture Rate [Member]                
Debt Instrument, Measurement Input 0              
Senior Promissory Notes [Member] | Maximum [Member]                
Debt Instrument, Interest Rate, Stated Percentage 16.00%              
Convertible Debt [Member]                
Debt Instrument, Face Amount     $ 15,000,000.0          
Debt Instrument, Redemption Price, Percentage     112.00%          
Debt Instrument, Convertible, Conversion Ratio     805.3992          
Debt Instrument, Periodic Payment, Principal   $ 840,000            
Debt Instrument, Redemption Covenant, Floor Price (in dollars per share) | $ / shares     $ 14.00          
Repayments of Convertible Debt $ 13,446,875 $ 840,000            
Repayments of Convertible Debt, Principal 11,640,000              
Repayments of Convertible Debt, Premium $ 1,806,875              
Interest Expense, Debt       0 121,458 0 308,958  
Amortization of Debt Issuance Costs       $ 0 $ 1,915,727 $ 0 $ 2,213,065