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Note 5 - Notes Payable (Details Textual)
3 Months Ended 12 Months Ended
Oct. 04, 2019
USD ($)
$ / shares
shares
Mar. 31, 2023
USD ($)
$ / shares
Mar. 31, 2022
USD ($)
Dec. 31, 2022
USD ($)
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares   $ 0.0555    
Amortization Associated With Commitment Fee   $ 4,337 $ 3,476  
Warrant Issued in Connection With Credit Agreement [Member]        
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares 3,000,000      
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares $ 0.052      
Amortization Expense Associated With Warrants   $ 11,929 11,257  
Credit Agreement And Note [Member]        
Debt Instrument, Interest Rate, Stated Percentage 10.00% 10.00%    
Debt Agreement, Maximum Borrowing Capacity $ 2,500,000      
Debt Instrument, Number of Tranches 16      
Proceeds from Notes Payable, Total       $ 2,345,000
Debt Instrument, Notes Payable, Portion Not Advanced       $ 155,000
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger 70.00%      
Debt Instrument, Convertible, Threshold Trading Days 15      
Debt Instrument, Convertible, Conversion Price (in dollars per share) | $ / shares $ 0.0329      
Line of Credit Facility, Commitment Fee Percentage 3.00%      
Credit Agreement And Note [Member] | Minimum [Member]        
Debt Instrument, Amount Funded in Each Monthly Tranche $ 125,000      
Credit Agreement And Note [Member] | Maximum [Member]        
Debt Instrument, Amount Funded in Each Monthly Tranche $ 175,000      
DAF Credit Agreement [Member]        
Interest Paid, Including Capitalized Interest, Operating and Investing Activities   $ 32,765 $ 33,298