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Note 7 - Stockholders' Equity (Tables)
9 Months Ended
Sep. 30, 2022
Notes Tables  
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
   

2022

   

2021

 

Common stock equivalents of convertible promissory notes and accrued interest

    43,612,759       7,071,241  

Warrants – other

    653,248       653,248  

Stock options

    287,081       366,595  

Total

    44,553,088       8,091,084