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Note 6 - Stockholders' Equity (Tables)
3 Months Ended
Mar. 31, 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 note and accrued interest

  17,420,222   6,449,950 

Warrants – other

  653,248   653,248 

Stock options

  342,670   889,636 

Total

  18,416,140   7,992,834