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Note 6 - Long-term Debt (Details Textual)
3 Months Ended
Jun. 22, 2022
USD ($)
$ / shares
shares
Mar. 01, 2022
USD ($)
Apr. 08, 2021
USD ($)
$ / shares
shares
Mar. 31, 2023
USD ($)
$ / shares
Mar. 31, 2022
USD ($)
Dec. 31, 2022
USD ($)
$ / shares
May 17, 2022
$ / shares
Stock Issued During Period, Shares, Issued for Commitment Fee (in shares) | shares     80,000        
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares     $ 0.001 $ 0.001   $ 0.001 $ 0.001
Senior Promissory Notes Warrant [Member]              
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares 4,250,000            
Senior Promissory Notes Placement Agent Warrants [Member]              
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares 230,000            
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares $ 0.65            
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  
Interest Expense, Debt       0 $ 0    
Amortization of Debt Issuance Costs       84,528 0    
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     435,158   $ 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 0.43            
Senior Promissory Notes [Member] | Measurement Input, Exercise Price [Member]              
Debt Instrument, Measurement Input 0.65            
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     0.1006749        
Debt Instrument, Periodic Payment, Principal   $ 840,000          
Debt Instrument, Redemption Covenant, Floor Price (in dollars per share) | $ / shares     $ 1.75        
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       0 187,500    
Amortization of Debt Issuance Costs       $ 0 $ 297,338